Wyniki wyszukiwania dla: numerical analysis

• Numerical simulations of sand behavior using DEM with 2 different descriptions of grain roughness

  Publikacja

  • J. Kozicki
  • J. Tejchman

  - Rok 2012

  W rozdziale przedstawiono wyniki dyskretnych symulacji jednorodnego trójosiowego ściskania piasku przy zastosowaniu metody elementów dyskretnych. Obliczenia wykonano stosując 2 różne opisy szorstkości ziaren: kule z uwzględnieniem momentów kontaktu oraz grona kul. Obliczono energię sprężystą i dysypację plastyczną. Wyniki symulacji numerycznych porównano z wynikami doświadczalnymi.

• Numerical studies on size effects in concrete beams. Architecture Civil Engineering Environment ACEE

  Publikacja

  • E. Korol
  • J. Tejchman

  - Architecture Civil Engineering Environment - Rok 2012

  W artykule przedstawiony wyniki obliczeń efektów skali w belkach betonowych podczas zginania. Zastosowano model sprężysto-plastyczny z nielokalnym osłabieniem. Rozkład wytrzymałości na rozciąganie był stochastyczny - przestrzennie skorelowany. Belki były geometrycznie podobne. Wyniki porównano z modelem efektu skali Bazanta.

• Numerical simulation of transient flow in storm sewers using standard and improved mccormack scheme

  Publikacja

  • M. Szydłowski
  • J. Machalińska-Murawska

  - TASK Quarterly - Rok 2012

  Problem przepływu wody w rurach kanalizacji deszczowej wiąże się z pewnymi specyficznymi zjawiskami zachodzącymi w przewodach podczas zjawisk burzowych. Jeśli rury zaczynają być całkowicie wypełnione wodą, można zaobserwować przejście z ruchu ze swobodną powierzchnią do ruchu pod ciśnieniem i odwrotnie. Takie zjawisko można zaobserwować również w kanałach kontrolowanych przez urządzenia sterujące, np. zasuwy. Ponadto ruch szybkozmienny...

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• Operational Enhancement of Numerical Weather Prediction with Data from Real-time Satellite Images

  Publikacja

  • Ł. Markiewicz
  • A. Chybicki
  • K. Drypczewski
  • K. Bruniecki
  • J. Dąbrowski

  - Rok 2013

  Numerical weather prediction (NWP) is a rapidly expanding field of science, which is related to meteorology, remote sensing and computer science. Authors present methods of enhancing WRF EMS (Weather Research and Forecast Environmental Modeling System) weather prediction system using data from satellites equipped with AMSU sensor (Advanced Microwave Sounding Unit). The data is acquired with Department of Geoinformatics’ ground...

• Experimental and numerical study on polymer element used for reduction of temporary steel grandstand vibrations

  Publikacja

  • N. Lasowicz
  • R. Jankowski

  - Rok 2016

  The purpose of the paper is to analyse the effectiveness of a polymer damper in reduction of a temporary steel grandstand vibrations through the experimental and numerical study. The damper considered in the investigation is constructed out of two L-shape steel members bonded with polymer mass of high damping properties. The element has been installed as a diagonal one at the back part of the structure. The method has been compared...

• Mechanics of mesh implanted into abdominal wall under repetitive load. Experimental and numerical study

  Publikacja

  • A. Tomaszewska
  • I. Lubowiecka
  • C. K. Szymczak

  - JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS - Rok 2019

  There are a number of papers discussing medical and mechanical aspects of ventral hernia management. Despite intensive work on the problem understanding, recurrences of the sickness still happen too often. For that reason new aspects of the problem must be considered. In this paper, a change in the abdominal implant’s stiffness is discussed, which is caused by cyclic loading. Such loading influence abdominal implant e.g. while...

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• Application of non-classical operational calculus to indicate hazards in numerical solutions of engineering problems

  Publikacja

  • E. Mieloszyk
  • M. Wyroślak

  - Studia Geotechnica et Mechanica - Rok 2020

  The article addresses the application of non- classical operational calculus to approximative solutions of engineering problems. The engineering-sound examples show that a continuous–discrete problem transformation from differential unequivocal problem to a differential wildcard problem, triggering a change in solution quality. A number of approximative methods are capable to alter both quantitative and qualitative...

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• Physical and numerical modelling of flow pattern and combustion process in pulverized fuel fired boiler.

  Publikacja

  • J. Barański

  - Rok 2002

  W pracy przedstawiono źródła powstawania toksycznych związków podczas procesu spalania, metody ich redukcji. Do tego zadania wykorzystano eksperymentalne modelowanie fizyczne i uzupełniono je modelowaniem numerycznym. Obie metody, techniki modelowania miały na celu optymalizację procesu spalania.Wyniki obliczeń numerycznych porównano z pomiarami.

• Experimental and numerical investigation of mercury removal from flue gas by sorbent polymer composite

  Publikacja

  • A. Ryfa
  • R. Żmuda
  • S. Mandrela
  • R. Białecki
  • W. Adamczyk
  • M. L. Nowak
  • Ł. Lelek
  • D. Bandoła
  • M. Pichura
  • J. Płonka
  • M. Wdowin

  - FUEL - Rok 2023

  This paper presents an experimental and numerical investigation of the performance of a sorbent polymer composite (SPC) material used for removing mercury from the flue gases in a full-scale industrial installation. The investigated material is an attractive alternative to activated carbon, which is commonly used for this purpose. While the application of the SPC is characterized by high capital expenditures, this technology offers...

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• Novel strategies to enhance hydrodynamic cavitation in a circular venturi using RANS numerical simulations

  Publikacja

  • N. Dutta
  • P. Kopparthi
  • A. K. Mukherjee
  • N. Nirmalkar
  • G. Boczkaj

  - WATER RESEARCH - Rok 2021

  Hydrodynamic cavitation is a popular advanced oxidation technique and it has received wide range of applications from waste water treatment to the nanoparticles synthesis in recent years. The enhancement of the intensity of the hydrodynamic cavitation is always been an emerging field of research. Within this framework, we have proposed and investigated three distinct strategies to enhance the intensity of cavitation in a circular...

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• FEM-based wave propagation modelling for SHM: Certain numerical issues in 1D structures

  Publikacja

  • M. Palacz
  • A. Żak
  • M. Krawczuk

  - Materials - Rok 2020

  The numerical modelling of structural elements is an important aspect of modern diagnostic systems. However, the process of numerical implementation requires advanced levels of consideration of multiple aspects. Important issues of that process are the positive and negative aspects of solution applied methods. Therefore the aim of this article is to familiarise the reader with the most important aspects related to the process of...

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• Comparision of two numerical methods for buried steel culverts made of corrugated shell sheets.

  Publikacja

  • C. Branicki

  - Rok 2002

  W pracy omawia się dwie metody analizy statycznej obudowy tuneli i przepustów dużej średnicy. Pierwsza z nich, metoda sprężyn polega na modelowaniu ośrodka gruntowego radialnymi sprężynami reprezentującymi odkształcalność gruntu. Drugie podejście oparte jest na zastosowaniu metody elementów skończonych i programu SOFISTIC. W układzie obudowa - grunt obudowę modeluje się zwykłymi ramowymi elementami sprężystymi a otaczający...

• Numerical simulation of rapidly varied water flow in the ´Wild River´ type water slide

  Publikacja

  • K. Burzyński
  • M. Szydłowski

  - Archives of Hydro-Engineering and Environmental Mechanics - Rok 2003

  Przedstawiono numeryczną analizę przepływu w zjeżdżalni wodnej typu "Dzika Rzeka". Jako model matematyczny przyjęto równania przepływu wody płytkiej. Wobec szybkozmiennego ruchu wody do rozwiązania zastosowano metodę objętości skończonych. Numeryczną symulację przepływu wykonano na trójkątnej siatce niestrukturalnej. Wyniki obliczeń porównano z obserwacjami na obiekcie rzeczywistym zainstalowanym w parku wodnym w Sopocie. Dodatkowo...

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• Physical and numerical modelling of heat-flow processes in tangentially pulverized fuel-fired boiler

  Publikacja

  • J. Barański
  • J. Stąsiek
  • W. Błasiak

  - TASK Quarterly - Rok 2003

  Praca przedstawia wykorzystanie eksperymentalnego modelowania fizycznego kwasowo-zasadowego do modernizacji kotła pyłowego z tangencjalną komorą spalania w aspekcie ograniczenia emisji toksycznych składników węgla, siarki i azotu oraz doboru optymalnych parametrów termodynamicznych mieszania i spalania. Dodatkowo, w celu porównania wyników pomiarów kotła po modernizacji, wykonano obliczenia numeryczne z zastosowaniem oprogramowania...

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• Numerical calculations of wall pressures and stresses in steel cylindrical silos with concentric and eccentric hoppers

  Publikacja

  • G. G. Enstad
  • M. Jecmenica
  • M. Wójcik

  - PARTICULATE SCIENCE AND TECHNOLOGY - Rok 2003

  Artykuł przedstawia numeryczną analize naprężeń w płaszczu silosa. Porównane zostały wyniki dla silosów o przepływie centrycznym i mimośrodowym.

• Research into flows in turbine blade seals. Part III: Numerical calculations versus experiment

  Publikacja

  • K. Kosowski
  • R. Stępień
  • M. Piwowarski
  • J. Badur

  - TASK Quarterly - Rok 2003

  Przedstawiono wyniki badań doświadczalnych przepływów w uszczelnieniu nadbandażowym stopnia turbinowego, przeprowadzonych na powietrznej turbinie modelowej. Rezultaty te porównano z wynikami badań numerycznych z zastosowaniem programu Fluent.

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• Model test and numerical simulations of earth pressure of non-cohesive soil in 3D formulation.

  Publikacja

  • P. E. Srokosz
  • E. Dembicki
  • M. Boulon

  - Rok 2003

  W pracy przedstawiono wyniki badań modelowych i obliczeń numerycznych parcia gruntu niespoistego w układzie przestrzennym działajacego na sztywną ścia- nę oporową. Podstawowe schematy wyznaczenia parcia gruntu na sztywną ścianę oporową opatre sa na obrocie ściany wokół jej wierzchołka i podstawy. Uzys- kane wyniki obliczeń przedstawiono jako rozkład składowych statycznych i normalnych wzdłuż sciany. Podano również wypadową parcia...

• Model tests and numerical imulations of earth pressure of non - cohesive soil in 3D formulation.

  Publikacja

  • P. E. Srokosz
  • E. Dembicki
  • M. Boulon

  - Rok 2004

  W artykule przedstawiono wyniki badań modelowych i symulacji numerycznych parcia gruntu działającego na sztywne konstrukcje oporowe. Analizowano stan przestrzennego odkształcenia ośrodka niespoistego. Parcie czynne gruntu za- sypowego wywołano obrotem ściany oporowej wokół osi przechodzącej przez jej górną i dolną krawędź. Przedstawiono rozkład składowej stycznej i normalnej stanu naprężenia na powierzchni ściany wraz z analizą...

• Influence of steel brackets supporting crane runway girders structure on the stress distribution in the brackets

  Publikacja

  • N. Korcz-Konkol
  • P. Iwicki
  • E. Urbańska-Galewska

  - Rok 2019

  The paper presents a numerical analysis of steel brackets supporting a double-span crane runway girders. The purpose of the study was to assess the new structural solution based on the stress distribution in the brackets. In order to simplify the connection, the bottom flange of the crane runway girder is based directly on the upper flange of the bracket. As a result, the support reaction is no longer applied in the plane of the...

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• Resonance Frequency Calculation of a Multilayer and Multipatch Spherical Microstrip Structure Using a Hybrid Technique

  Publikacja

  • A. Kusiek
  • R. Lech

  - IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION - Rok 2016

  This communication offers a rigorous analysis of the resonance frequency problem of a spherical microstrip structure mounted on a multilayer, dielectric-coated metallic sphere, with an electrically small radius. The structure consists of single or multiple metallic patches with arbitrary shapes. A full-wave analysis is employed with the use of proposed hybrid approach, combining the finite-difference technique with a spectral domain...

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• Marcin Kujawa dr hab. inż.

  Osoby

  Katedra Mechaniki Budowli

  Marcin Kujawa ukończył studia na Wydziale Budownictwa Lądowego Politechniki Gdańskiej w 1999 roku, uzyskując stopień magistra inżyniera w specjalności mosty. Stopień naukowy doktora nauk technicznych w dziennie: budownictwo, pod kierunkiem profesora Czesława Szymczaka, uzyskał w 2007 roku na Wydziale Inżynierii Lądowej Politechniki Gdańskiej, broniąc pracę doktorską, pt.: Statyka i analiza wrażliwości rusztów zbudowanych z prętów...

• Identification of Parameters Influencing the Accuracy of the Solution of the Nonlinear Muskingum Equation

  Publikacja

  • D. Gąsiorowski
  • R. Szymkiewicz

  - WATER RESOURCES MANAGEMENT - Rok 2020

  Two nonlinear versions of the Muskingum equation are considered. The difference between both equations relates to the exponent parameter. In the first version, commonly used in hydrology, this parameter is considered as free, while in the second version, it takes a value resulting from the kinematic wave theory. Consequently, the first version of the equation is dimensionally inconsistent, whereas the proposed second one is consistent. It...

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• Modeling of Passive and Forced Convection Heat Transfer in Channels with Rib Turbulators

  Publikacja

  • J. Stąsiek
  • A. Stąsiek
  • M. Szkodo

  - ENERGIES - Rok 2021

  The main goal of the research presented in this paper was the experimental and numerical analysis of heat enhancement and aerodynamic phenomena during air flow in a channel equipped with flow turbulators in the form of properly configured ribs. The use of ribs intensifies the heat transfer and at the same time increases not only the flow resistance but also the energy costs. Therefore, designing modern heat exchangers with optimal...

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• Mechanical simulation of artificial gravity in torus-shaped and cylindrical spacecraft

  Publikacja

  • S. Dastjerdi
  • M. Malikan
  • V. Eremeev
  • B. Akgöz
  • Ö. Civalek

  - ACTA ASTRONAUTICA - Rok 2021

  Large deformations and stress analyses in two types of space structures that are intended for people to live in space have been studied in this research. The structure under analysis is assumed to rotate around the central axis to create artificial gravitational acceleration equal to the gravity on the Earth's surface. The analysis is fully dynamic, which is formulated based on the energy method by using the first-order shear deformation...

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• Acoustic streaming caused by some types of aperiodic sound. Buildup of acoustic streaming

  Publikacja

  • A. Perelomova
  • P. Wojda

  - Archives of Acoustics - Rok 2009

  The analysis of streaming caused by aperiodic sound of different types (switched on at transducer sound or sound determined by initial conditions) is undertaken. The analysis bases on analytical governing equation for streaming Eulerian velocity, which is a result of decomposition of the hydrodynamic equations into acoustic and non-acoustic parts. Its driving force (of acoustic nature) represents a sum of two terms; one is the...

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• Arch bridges under test loadings

  Publikacja

  • J. Chróścielewski
  • M. Malinowski
  • M. Miśkiewicz

  - Journal of KONES - Rok 2008

  This paper illustrates experience in arch bridges test loadings of the research team of Department of Structural Mechanics and Bridge Structures from the Gdansk University of Technology. The presented calculations results constist the analysis of spatial construction schemes made using the finite elements method (FEM) and its comparison to the field studies. Arch bridges with the longest spans, visualisation of the computational...

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• Communication Model Order Reduction in Hybrid Methods Involving Generalized Impedance Matrix

  Publikacja

  • G. Fotyga
  • D. Szypulski
  • R. Lech
  • P. Kowalczyk

  - IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION - Rok 2020

  A novel strategy for the efficient analysis of frequency-domain scattering electromagnetic problems in open and closed domains is presented. A fully automatic model-order reduction technique, called the enhanced reduced-basis method, is applied to increase the efficiency of the hybrid approach, which combines the finite-element and mode-matching methods. Numerical tests show that the proposed algorithm yields reliable and highly...

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• FEM approach to estimate the behaviour of biocomposite metal-surface coating system

  Publikacja

  • S. Sobieszczyk
  • W. Wojnicz
  • B. Nowak

  - Advances in Materials Science - Rok 2008

  A three dimensional (3D) model of biocomposite metal-surface coating system, which is influenced byknown external forces, is proposed. This model consists of the metallic substrate (Ti6Al4V) and thehydroxyapatite (HA) coating. Using FEM (finite element method), strain-stress maps of model weregenerated for investigating relations between the extreme stress of HA coating and the magnitude ofexternal force and the thickness of the...

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• Reduction of Derivative pipeline effort in water turbine

  Publikacja

  • L. Flis
  • S. Dobrociński
  • W. Kiełczyński

  - Studia Geotechnica et Mechanica - Rok 2013

  The paper presents an approach to evaluate and reduce the effort of the derivative pipeline in a water turbine of a hydrostatic power station in its vulnerable spots. Potential places of the biggest effort of the structure, as well as the coefficient of displacement and safety factor related to them were identified using FEM numerical method. Pipeline reinforcement was designed and made based on FEM analysis. Original technology...

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• Experimental Verification of Storm Sewer Transient Flow Simulation

  Publikacja

  • M. Szydłowski

  - Archives of Hydro-Engineering and Environmental Mechanics - Rok 2014

  The paper focuses mainly on laboratory investigations of transient and transcritical flow in a single pipe of a sewer system. The aim of this paper is to present a comparison between pressure values calculated by an improved McCormack scheme and those measured at the hydraulic laboratory of the Gdansk University of Technology, which were observed inside a pipe in an experiment for water flow with pressurization. The analysis proves...

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• Investigation of the Aerodynamics of an Innovative Vertical-Axis Wind Turbine

  Publikacja

  • K. Tesch
  • K. Kludzinska
  • P. Doerffer

  - FLOW TURBULENCE AND COMBUSTION - Rok 2015

  The paper presents the results of an experimental investigation and a three dimensional numerical analysis of the transient aerodynamic phenomena occurring in the innovative modification of classic Savonius wind turbine. An attempt to explain the increased efficiency of the innovative design a comparison with the traditional solution is undertaken. A vorticity measure based on the integral of the velocity gradient tensor second...

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• Weighted difference schemes for systems of quasilinear first order partial functional differential equations

  Publikacja

  • A. Szafrańska

  - Mathematica Applicanda (Matematyka Stosowana) - Rok 2015

  The paper deals with initial boundary value problems of the Dirichlet type for system of quasilinear functional differential equations. We investigate weighted difference methods for these problems. A complete convergence analysis of the considered difference methods is given. Nonlinear estimates of the Perron type with respect to functional variables for given functions are assumed. The proof of the stability of difference problems...

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• New Tool for Examining QoS in the VToIP Service

  Publikacja

  • T. Uhl
  • K. Nowicki
  • S. Paulsen

  - Journal of Telecommunications and Information Technology - Rok 2014

  This paper is dedicated to the subject of measuring QoS in the Video Telephony over IP (VToIP) service. QoS measurement models in general and then models designed specifically for measuring QoS in the VToIP service are presented. A new numerical tool for examining the quality of VToIP video streams VToIP is described. The tool’s functionality is then put to the test in a number of analysis scenarios. The results and insights gained...

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• Selected problems of sensitivity and reliability of a jack-up platform

  Publikacja

  • B. Rozmarynowski
  • T. Mikulski

  - Polish Maritime Research - Rok 2018

  The paper deals with sensitivity and reliability applications to numerical studies of an off-shore platform model. Structural parameters and sea conditions are referred to the Baltic jack-up drilling platform. The study aims at the influence of particular basic variables on static and dynamic response as well as the probability of failure due to water waves and wind loads. The paper presents the sensitivity approach to a generalized...

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• Electromagnetic Simulations with 3D FEM and Intel Optane Persistent Memory

  Publikacja

  • M. Jakubowski
  • P. Sypek

  - Rok 2022

  Abstract—Intel Optane persistent memory has the potential to induce a change in how high-performance calculations requiring a large system memory capacity are conducted. This article presents what this change may look like in the case of factorization of large sparse matrices describing electromagnetic problems arising in the 3D FEM analysis of passive highfrequency components. In numerical tests, the Intel oneAPI MKL PARDISO was...

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• Flood Routing by the Non-Linear Muskingum Model: Conservation of Mass and Momentum

  Publikacja

  • D. Gąsiorowski

  - Archives of Hydro-Engineering and Environmental Mechanics - Rok 2009

  In this paper, the conservative properties of the Muskingum equation, commonly applied to solve river flood routing, are analysed. The aim of this analysis is to explain the causes ofthe mass balance error, which is observed in the numerical solutions of its non-linear form. The linear Muskingum model has been considered as a semi-discrete form of the kinematic wave equation and therefore it was possible to derive its two non-linear...

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• CONSTRUCTION TECHNOLOGY OF TIMBER-FRAME HOUSES RESISTANT TO DYNAMIC LOADS – STUDY ON MODELS OF EXTERIOR WALLS

  Publikacja

  • M. Szczepański
  • W. Migda
  • R. Jankowski

  - Advances in Science and Technology Research Journal - Rok 2015

  The aim of this paper is to show the numeric representation of experimental studies concerning the behaviour of exterior wall models of a timber-frame house under harmonic loading. A single wall model according to traditional technology of timberframe house walls (filling with mineral wool) was tested. The analysis was conducted for the following frequencies: 0.5 Hz, 1.0 Hz, 2.0 Hz and 5.0 Hz for various values of the specified...

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• Footbridges. Dynamic Design – Selected Problems

  Publikacja

  • K. Żółtowski
  • M. Binczyk
  • P. Kalitowski

  - Rok 2017

  Modern footbridges create challenge in esthetic and structural design. Breaking the proven canons is a recipe for architectural success. However esthetic form has to be also a functional pedestrian bridge. Therefore a good FEM modeling is a key element in engineering part of design. The paper presents selected problems related to the modeling of the dynamic construction of footbridges. Several basic dynamic problems concerning...

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• FEM modelling of stress and strain distribution in weld joints of steel sandwich panels

  Publikacja

  • J. Kozak
  • K. Niklas

  - Welding International - Rok 2015

  The development of laser welding technology has enabled the mass production of thin-walled structures, including steel sandwich panels. The technology of joining plating panels with stiffeners by welding allows us to create joints with a specific geometry and material properties. In comparison with other types of joints, laser welds are characterized by their specific behaviour under cyclic load and, as a consequence, a different...

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• Wpływ sposobu odwzorowania pojazdu szynowego na odpowiedź dynamiczną przęsła mostowego

  Publikacja

  • M. Szafrański

  - Przegląd Komunikacyjny - Rok 2019

  W pracy przedstawiono rezultaty analiz numerycznych oraz badań eksploatacyjnych dwóch przęseł mostowych wymuszonych ruchomym pojazdem szynowym. Pojazd odwzorowano za pomocą czterech modeli uproszczonych: strumienia sił skupionych, strumienia mas skupionych oraz strumieni oscylatorów jedno- i dwumasowych. Analizy numeryczne wykonano przy wykorzystaniu MES. Potrzebne parametry dynamiczne wyznaczono na podstawie wyników identyfikacji...

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• ADAPTIVE METHOD FOR THE SOLUTION OF 1D AND 2D ADVECTION-DIFFUSION EQUATIONS USED IN ENVIRONMENTAL ENGINEERING

  Publikacja

  • R. Szymkiewicz
  • D. Gąsiorowski

  - JOURNAL OF HYDROINFORMATICS - Rok 2021

  The paper concerns the numerical solution of one-dimensional (1D) and two-dimensional (2D) advection-diffusion equations. For the numerical solution of the 1D advection-diffusion equation a method, originally proposed for solution of the 1D pure advection equation, has been developed. A modified equation analysis carried out for the proposed method allowed increasing of the resulting solution accuracy and consequently, to reduce...

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• Probabilistic sensitivity of limit states of structures. The Monte Carlo simulation

  Publikacja

  • M. Skowronek

  - Rok 2013

  Design sensitivity deals with the variation of structural response, implicitly dependent on the design variables of the problem. An attempt is made to implement probabilistic notation in engineering sensitivity analysis. The procedure to implement the sensitivity of a structural limit state to a given basic variable is described in the paper - its main idea, depicted by a flowchart and numerical examples of engineering analysis....

• Large deformation modelling of CPT probing in soft soil—pore water pressure analysis

  Publikacja

  • J. Konkol
  • L. Bałachowski

  - Rok 2018

  This paper presents the results of finite element modelling with Updated Lagrangian formulation of the Cone Penetration Test in soft soil deposit located in Jazowa, Poland. The numerical calculations are carried out for homogenous, normally consolidated, organic soil layer. The Modified Cam Clay constitutive model for soft soil and Coulomb model for interface are used. The study compares the registered pore water pressure distributions...

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• PA32 aluminum alloy - tensile properties

  Dane Badawcze

  open access

  • J. Kowalski

  In addition to steel, aluminium alloys are the main building material used in the shipbuilding industry. Due to its undoubted advantages, such as low density (nearly three times lower than in the case of steel for shipbuilding) and high corrosion resistance, it is often used for hulls of yachts and small vessels as well as superstructures. For safety...

• Strucutral steel - tensile test results

  Dane Badawcze

  open access

  • J. Kowalski

  Modern floating structures such as ships, oil platforms and offshore wind towers are built mostly of structural steel. It is a material that is subject to requirements which, when met, allows the construction and safe operation of the structure throughout its entire work cycle. One of the basic criteria that a material must meet is its strength. The...

• Two-dimensional diffusion wave model for numerical simulation of inundation - Upper Narew case study

  Publikacja

  • M. Szydłowski

  - Rok 2008

  Przedstawiono zastosowanie uproszczonego modelu matematycznego przepływu wody ze swobodną powierzchnią, zwanego falą dyfuzyjną, do numerycznej symulacji zalewu powodziowego doliny rzeki. Równania modelu rozwiązano metodą objętości skończonych. Model w dwuwymiarowej wersji wykorzystano do odtworzenia przejścia fali powodziowej przez fragment doliny Górnej Narwi między miejscowościami Suraż i Łapy.

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• Numerical evaluation of spatial time-varying magnetisation of ferritic tubes excited with a C-core magnet

  Publikacja

  • M. Augustyniak
  • B. Augustyniak
  • M. Chmielewski
  • W. Sadowski

  - JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS - Rok 2008

  Przedstawiono uzyskane metodą elementów skończonych numeryczne oszacowanie czasowo-przestrzennego rozkładu magnetyzacji w ferrytycznych rurach magnesowanych elektromagnesem typu C. Wzięto pod uwagę nieliniowe własności magnetyczne oraz występowanie prądów wirowych. Prąd magnesujący miał charakter piłokształtny.

• Changes in Hydrographic Conditions Associated with 2005–2007 Storm Surges in the Odra Mouth — a Numerical Study

  Publikacja

  • H. Kowalewska-Kalkowska
  • M. Kowalewski
  • M. Kowalewski

  - Rok 2008

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• Numerical Modeling of Steel Surface Hardening in the Process of High Energy Heating by High Frequency Currents

  Publikacja

  • V. Skeeba
  • V. Ivancivsky
  • V. Pushnin

  - Applied Mechanics and Materials - Rok 2014

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• Numerical simulations of a triaxial test in granular bodies using discrete particle simulations with contact moments

  Publikacja

  • J. Tejchman
  • Ł. Widuliński
  • J. Kozicki

  - Rok 2009

  W artykule przedstawiono wyniki symulacji badania trójosiowego dla materiałów granulowanych. Obliczenia wykonano przy zastosowaniu metody DEM. Pokazano wpływ momentów kontaktowych na wytrzymałość próbki. Zbadano wpływ parametrów mikroskopowych.

• Two - scale model for concrete beams subjected to three point bending - numerical analyses and experiments

  Publikacja

  • Ł. Skarżyński
  • M. Nitka
  • J. Tejchman

  - Rok 2014

  Artykuł omawia dwu-skalowe podejście do betonu przy wykorzystaniu połączonych modeli. Metodę elementów skończonych zastosowano na poziomie makro. Na poziomie mikro zastosowano metodę elementów dyskretnych. Macierz sztywności wyznaczono na podstawie tensora naprężeń wyznaczonego w skali mikro. Wyniki numeryczne dw-skalowe porównano z wynikami dyskretnymi dla całego obszaru.

• EXPERIMENTAL AND NUMERICAL INVESTIGATIONS OF CONCRETE BEHAVIOUR AT MESO-LEVEL DURING QUASI-STATIC SPLITTING TENSION

  Publikacja

  • J. Suchorzewski
  • J. Tejchman

  - Rok 2017

  The paper describes experimental and numerical results of quasi-static splitting tensile tests on concrete specimens at meso-scale level. The loading strip was made of plywood or steel. Fracture in concrete was detected at the aggregate level by means of three non-destructive methods: 3D x-ray micro-computed tomography, 2D scanning electron microscope and manual 2D digital microscope. The discrete element method was used to directly...

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• Experimental and numerical investigations of concrete behaviour at meso-level during quasi-static splitting tension.

  Publikacja

  • J. Suchorzewski
  • J. Tejchman
  • M. Nitka

  - THEORETICAL AND APPLIED FRACTURE MECHANICS - Rok 2018

  Artykuł omawia wyniki numeryczne dotyczące pękania betonu uzyskane stosując metodę elementów dyskretnych. Dwuwymiarowe obliczenia wykonano dla próbek betonowych podczas rozłupywania. Beton został opisany jako model 4-fazowy. Mikrostruktura betonu odpowiadała zdjęciom tomograficznym. Zbadano wpływ warunków brzegowych na proces pękania. W obliczeniach zwrócono uwagę na porzebieg zjawisk mikrostrukturalnych przebieg pękania. Wyniki...

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• Experimental and numerical assessment of size effect in geometrically similar slender concrete beams with basalt reinforcement

  Publikacja

  • E. Korol
  • J. Tejchman
  • Z. Mróz

  - ENGINEERING STRUCTURES - Rok 2017

  W artykule przedstawiono doświadczalne i numeryczne wyniki badań efektu skali w geometrycznie podobnych smukłych belkach betonowych ze zbrojeniem bazaltowym. Doświadczenia zostały symulowane stosując metodę elementów skończonych w oparciu o model sprężysto-plastyczny z degradacją sztywności i nielokalnym osłabieniem. Otrzymano dobrą zgodność wyników doświadczalnych z numerycznymi.

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• A new approach to numerical solution of fixed-point problems and its application to delay differential equations

  Publikacja

  • Z. Bartoszewski

  - APPLIED MATHEMATICS AND COMPUTATION - Rok 2010

  W pracy rozpatruje się pewne aproksymacje punktu stałego ciągłego operatora A odwzorowującego przestrzeń metryczną w siebie. Wspomniany punkt stały przybliża się tzw. epsilon przybliżonym punktem stałym z przestrzeni skończenie wymiarowej. Udowodnione zostało twierdzenie dające warunki konieczne i dostateczne istnienia punktu stałego w ogólnej przestrzeni metrycznej. Warunki te wyrażone są w terminach epsilon przybliżonego punktu...

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• Experimental study and numerical simulation of low calorific fuel combustion at different oxygen content in the oxydizer

  Publikacja

  • J. Stąsiek
  • J. Barański
  • M. Jewartowski

  - Rok 2011

  W pracy przedstawiono wyniki badań eksperymentalnych oraz obliczeń numerycznych procesu spalania paliwa gazowego niskokalorycznego w utleniaczu o podwyższonej temperaturze i zmiennej zawartości tlenu. Badanym paliwem był gaz o składzie zbliżonym do paliwa pochodzącego z gazyfikacji biomasy. Spalanie przeprowadzano dla zmiennej wartości temperatury utleniacza oraz zawartości tlenu. Obliczenia numeryczne wykonano z wykorzystaniem...

• Comparing N3-60 cascade exit angles obtained from tunnel measurements and numerical calculations

  Publikacja

  • R. Biernacki
  • P. Krzyślak

  - Polish Maritime Research - Rok 2010

  The article compares the results of measurements performed in the aerodynamic tunnel at CUT and numerical simulation carried out for a plane cascade of N3-60 profiles. Comparing the measured and calculated results provides opportunities for assessing the range of systematic differences between simulation predictions and actual experimental results.

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• Size effect in concrete beams under bending – influence of the boundary layer and the numerical description of cracks

  Publikacja

  • I. Marzec
  • J. Bobiński

  - MATEC Web of Conferences - Rok 2019

  In the paper the size effect phenomenon in concrete is analysed. The results of numerical simulations of using FEM on geometrically similar un-notched and notched concrete beams under bending are presented. Concrete beams of four different sizes and five different notch heights under three-point bending test were simulated. In total 18 beams were analysed. Two approaches were used to describe cracks in concrete. First, eXtended...

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• Experimental tests and numerical simulations of full scale composite sandwich segment of a foot- and cycle- bridge

  Publikacja

  • M. Miśkiewicz
  • K. Daszkiewicz
  • T. Ferenc
  • W. Witkowski
  • J. Chróścielewski

  - Rok 2016

  In the paper experimental tests and numerical simulations of a full cross-section segment of ultimately designed foot-and cycle-bridge are presented. The experimental tests were conducted on element with length reduced to 3 m and unchanged (target) cross-section dimensions. The external skin of structure is GFRP laminate while internal core is PET foam. Several quasi-static tests were performed using hydraulic cylinder to generate...

• Impact of Energy Slope Averaging Methods on Numerical Solution of 1D Steady Gradually Varied Flow

  Publikacja

  • W. Artichowicz
  • D. Prybytak

  - Archives of Hydro-Engineering and Environmental Mechanics - Rok 2015

  In this paper, energy slope averaging in the one-dimensional steady gradually varied flow model is considered. For this purpose, different methods of averaging the energy slope between cross-sections are used. The most popular are arithmetic, geometric, harmonic and hydraulic means. However, from the formal viewpoint, the application of different averaging formulas results in different numerical integration formulas. This study...

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• Numerical investigation on dynamic performance of a multi-storey steel structure model and comparison with experimental results

  Publikacja

  • T. Falborski
  • B. Sołtysik
  • R. Jankowski

  - Rok 2018

  Shaking table testing is the most commonly adopted method to simulate earthquake forces. This approach allows us to analyze the dynamic performance and provides a valuable insight into the dynamics of building structures, which helps to improve their future safety and reliability. The present study aims to conduct a numerical evaluation of dynamic response of a multi-storey steel structure model, which was previously examined during...

• Multibeam Echosounder and LiDAR in Process of 360-Degree Numerical Map Production for Restricted Waters with HydroDron

  Publikacja

  • A. Stateczny
  • M. Wlodarczyk-Sielicka
  • D. Gronska
  • W. Motyl

  - Rok 2018

  In order to increase the safety of inland navigation and facilitate the monitoring of the coastal zone of restricted waters, a model of multi-sensory fusion of data from hydroacoustic and optoelectronic systems mounted on the autonomous survey vessel HydroDron will be developed. In the research will be used the LiDAR laser scanner and multibeam echosounder. To increase the visual quality and map accuracy, additionally side scan...

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• Numerical Investigation on Dynamic Performance of a Multi-storey Steel Structure Model and Comparison with Experimental Results

  Publikacja

  • T. Falborski
  • B. Sołtysik
  • R. Jankowski

  - Rok 2018

  Shaking table testing is the most commonly adopted method to simulate earthquake forces. This approach allows us to analyze the dynamic performance and provides a valuable insight into the dynamics of building structures, which helps to improve their future safety and reliability. The present study aims to conduct a numerical evaluation of dynamic response of a multi-storey steel structure model, which was previously examined during...

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• Numerical Solution of the Two-Dimensional Richards Equation Using Alternate Splitting Methods for Dimensional Decomposition

  Publikacja

  • D. Gąsiorowski
  • T. Kolerski

  - Water - Rok 2020

  Research on seepage flow in the vadose zone has largely been driven by engineering and environmental problems affecting many fields of geotechnics, hydrology, and agricultural science. Mathematical modeling of the subsurface flow under unsaturated conditions is an essential part of water resource management and planning. In order to determine such subsurface flow, the two-dimensional (2D) Richards equation can be used. However,...

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• Numerical simulation of the influence of the selected factors on the performance of a concrete road barrier H2/W5/B

  Publikacja

  • Ł. Pachocki
  • K. Wilde

  - MATEC Web of Conferences - Rok 2018

  This paper discuss the influence of selected factors on the performance of a concrete road barrier H2/W5/B. Modelling techniques of a concrete road safety system were briefly discussed. Comparison to the full scale crash test results has been shown. The concrete road safety barrier has been investigated for evaluation of the overall damage after collision under various initial conditions. The failure assessment criterion has been...

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• Numerical studies on the influence of selected construction features and road conditions on the performance of road cable barriers

  Publikacja

  • D. Bruski
  • W. Witkowski

  - Rok 2018

  Cable barriers are commonly used on Polish roads, including motorways and local roads. Their main elements are pre-stressed wire ropes, which are usually anchored at two ends in concrete blocks buried in the soil. In this work numerical studies concerning the influence of selected construction features and parameters of the vehicle motion on the performance of cable barriers were performed. Numerical simulations are a useful tool...

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• On the theory and numerical simulation of acoustic and heat modes interaction in a liquid with bubbles: acoustic quasi-solitons

  Publikacja

  • A. Perelomova
  • S. Kshevetskii

  - APPLIED MATHEMATICAL MODELLING - Rok 2002

  Teoria rzutowania zaburzenia ogólnego na mody. Zastosowanie metody do badań układu równań typu Korteweg`a-de Vries`a. Rozwiązania analityczne i simulacje numeryczne.

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• Data set generation at novel test-rig for validation of numerical models for modeling granular flows

  Publikacja

  • A. Widuch
  • K. Myöhänen
  • M. Nikku
  • M. L. Nowak
  • A. Klimanek
  • W. Adamczyk

  - INTERNATIONAL JOURNAL OF MULTIPHASE FLOW - Rok 2021

  Significant effort has been exerted on developing fast and reliable numerical models for modeling particulate flow; this is challenging owing to the complexity of such flows. To achieve this, reliable and high-quality experimental data are required for model development and validation. This study presents the design of a novel test-rig that allows the visualization and measurement of particle flow patterns during the collision...

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• Speed estimation of a car at impact with a W-beam guardrail using numerical simulations and machine learning

  Publikacja

  • D. Bruski
  • Ł. Pachocki
  • A. Ścięgaj
  • W. Witkowski

  - ADVANCES IN ENGINEERING SOFTWARE - Rok 2023

  This paper aimed at developing a new method of estimating the impact speed of a passenger car at the moment of a crash into a W-beam road safety barrier. The determination of such a speed based on the accident outcomes is demanding, because often there is no access to full accident data. However, accurate determination of the impact speed is one of the key elements in the reconstruction of road accidents. A machine learning algorithm...

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• EXPERIMENTAL AND NUMERICAL INVESTIGATION ON SPECIMEN GEOMETRY EFFECT ON THE CTOD VALUE FOR VL-E36 SHIPBUILDING STEEL

  Publikacja

  • J. Kowalski

  - Polish Maritime Research - Rok 2021

  There are special cases in the marine industry, where additional material tests, such as the fracture toughness test, must be performed. Additional fracture toughness tests, such as CTOD (Crack Tip Opening Displacement), are typically performed on three-point bend specimens. The dimension that defines all the specimen dimensions is the thickness of the material to be tested. It is recommended by classification societies (e.g. DNVGL)...

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• Experimental and numerical simulations of flow and heat transfer in heatexchanger elements using liquid crystal thermography.

  Publikacja

  • J. Stąsiek
  • M. Ciofalo
  • M. Wierzbowski

  - Rok 2003

  Przedstawienie koncepcji badań eksperymentalnych i numerycznych oraz ich wyników podczas wymiany ciepła w modelach klasycznych i płytowych wymienników ciepła w warunków przepływów przejściowych i turbulentnych.

• Approximate solution for Euler equations of stratified water via numerical solution of coupled KdV system

  Publikacja

  • A. Halim
  • S. Kshevetskii
  • S. Leble

  - International Journal of Mathematics and Mathematical Sciences - Rok 2004

  We consider Euler equations with stratified background state that is valid for internal water waves. The solution of the initial-boundary problem for Boussinesq approximation in the waveguide mode is presented in terms of the stream function. The orthogonal eigenfunctions describe a vertical shape of the internal wave modes and satisfy a Sturm-Liouville problem. The horizontal profile is defined by a coupled KdV system which is...

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• Analytical-numerical approach to solve the transport equation for steady gradually varied flow in open channel

  Publikacja

  • R. Szymkiewicz
  • K. Weinerowska-Bords

  - Rok 2005

  W pracy przedstawiono metodę rozwiązania równania transportu adwekcyjno-dyfuzyjnego w przypadku ustalonego niejednostajnego przepływu w kanałach otwartych. Metoda wykorzystuje technikę dekompozycji. Do rozwiązania równania adwekcji-dyfuzji zastosowano analityczne rozwiązanie w postaci odpowiedzi impulsowej liniowego równania adwekcji-dyfuzji. Dokonano adaptacji metody dla przypadku ze zmiennymi parametrami. Do rozwiązania drugiej...

• STAN AWARYJNY TRYBUNY STADIONU W ZIELONEJ GÓRZE WYWOŁANY SYNCHRONICZNYM TAŃCEM KIBICÓW

  Publikacja

  • K. Wilde
  • M. Rucka
  • K. Grębowski

  - Przegląd Budowlany - Rok 2014

  W artykule przedstawiono badania i naprawy trybuny stadionu żużlowego w Zielonej Górze narażonej na nadmierne drgania podczas synchronicznego tańca kibiców zwanego „Labado”. W trakcie prac wykonano dwa etapy wzmocnień: za pomocą dodatkowych słupków (zalecenie zespołu z Uniwersytetu Zielonogórskiego) oraz wzmocnienie dodatkowymi stężeniami całej konstrukcji zadaszenia trybuny. W artykule przedstawiono wyniki badań pomiarowych in...

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• STAN AWARYJNY TRYBUNY STADIONU W ZIELONEJ GÓRZE WYWOŁANY SYNCHRONICZNYM TAŃCEM KIBICÓW

  Publikacja

  • K. Wilde
  • M. Rucka
  • K. Grębowski

  - Rok 2013

  W artykule przedstawiono badania i naprawy trybuny stadionu żużlowego w Zielonej Górze narażonej na nadmierne drgania podczas synchronicznego tańca kibiców zwanego „Labado”. W trakcie prac wykonano dwa etapy wzmocnień: za pomocą dodatkowych słupków (zalecenie zespołu z Uniwersytetu Zielonogórskiego) oraz wzmocnienie dodatkowymi stężeniami całej konstrukcji zadaszenia trybuny. W artykule przedstawiono wyniki badań pomiarowych in...

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• STABILITY AND LOAD BEARING CAPACITY OF A BARS WITH BUILT UP CROSS SECTION AND ELASTIC SUPPORTS

  Publikacja

  • M. Krajewski

  - Civil and Environmental Engineering Reports - Rok 2015

  The present paper is devoted to the numerical analysis and experimental tests of compressed bars with built–up cross section which are commonly used as a top chord of the roof trusses. The significant impact on carrying capacity for that kind of elements in case of out-of-plane buckling is appropriate choice of battens which are used to provide interaction between separate members. Linear buckling analysis results and nonlinear static...

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• Thermal Analysis Of Hybrid Microchannel-Microjet Heat Exchanger

  Publikacja

  • T. Muszyński
  • R. Andrzejczyk

  - Rok 2014

  The paper presents the numerical investigation of a microjet- microchannel cooling module. In which microjets of water are impinging into the microchannels and forming a liquid film on the impingement surface. Applied technology takes benefits from two very attractive heat removal techniques. When laminar jets are impinging on the surface have a very high kinetic energy at the stagnation point, also in microchannels boundary layer...

• Nośność konstrukcji gruntowo-łukowej prefabrykowanego wiaduktu w świetle obliczeń numerycznych i badań „in situ”

  Publikacja

  • K. Żółtowski
  • T. Romaszkiewicz

  - Materiały Budowlane - Rok 2015

  Wartykule przedstawiono analizy przeprowadzone dla wiaduktu WK-15 Pomorskiej Kolei Metropolitalnej wykonanego w technologii łuków prefabrykowanych przykrytych gruntem (system TechSpan). W celu weryfikacji obliczeń numerycznych wykonano próbne obciążenie konstrukcji. Przedstawiono wyniki pomiarów naprężeń i prezmieszczeń konstrukcji. Odniesiono się krytycznie do zastosowanego modelu obliczeniowego.

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• Long-term hindcast simulation of currents in the Baltic Sea

  Dane Badawcze

  wersja 2.0 open access

  • M. Kowalewski

  - seria: Long-term hindcast simulation of hydrodynamics in the Baltic Sea

  The dataset contains the results of numerical modelling of currents over a period of 50 years (1958-2007) in the Baltic Sea . A long-term hindcast simulation was performed using a three-dimensional hydrodynamic model PM3D (Kowalewski and Kowalewska-Kalkowska, 2017), a new version of the M3D model (Kowalewski, 1997).  The hydrodynamic model was coupled...

• Rainscreen panels deformations mods

  Publikacja

  • P. Lewandowski
  • E. Urbańska-Galewska

  - Rok 2014

  In rainscreen panels designing simplified calculation models are used. For plate computation simply supported panels or panels with fixed edges are commonly used. Such approximations are subjected to large errors that lead to inefficient rainscreen panels design. In order to develop a method for determining the optimal geometry of the rainscreen panels, that would take into consideration the real stiffness of both continuous and...

• The smoothness test for a density function

  Publikacja

  • B. Ćmiel
  • K. Dziedziul
  • B. Wolnik

  - NONLINEAR ANALYSIS-THEORY METHODS & APPLICATIONS - Rok 2014

  The problem of testing hypothesis that a density function has no more than μ derivatives versus it has more than μ derivatives is considered. For a solution, the L2 norms of wavelet orthogonal projections on some orthogonal ‘‘differences’’ of spaces from a multiresolution analysis is used. For the construction of the smoothness test an asymptotic distribution of a smoothness estimator is used. To analyze that asymptotic distribution,...

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• Stability and load bearing capacity of a truss with elastic braces

  Publikacja

  • M. Krajewski
  • P. Iwicki

  - Rok 2014

  The present paper is devoted to the numerical and experimental investigations of stability of a truss stiffened by elastic braces. The model of a real roof truss scaled by factor ¼ was investigated. In the research the linear buckling and non-linear static analysis of the truss shell and beam model with geometric and material non-linearity is presented. The initial imperfections were assumed in the form of the first buckling mode....

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• Entropy function application within the selection process of diagnostic parameters of marine diesel and gas turbine engines

  Publikacja

  • Z. Korczewski

  - Polish Maritime Research - Rok 2010

  The paper presents the method of conducting an analysis of the diagnostic informativeness among the parameters characterizing the observed gas dynamic processes carried out within working spaces of marine diesel and gas turbine engines. An entropy function, as the measure of uncertainty of the identified states' set of the engine unfitness was applied. Having evaluated the diagnostic information the most adequate parameters were...

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• DYNAMIC RESPONSE OF FORUM GDANSK STRUCTURE DUE TO RAIL TRAFFIC

  Publikacja

  • M. Miśkiewicz
  • Ł. Pyrzowski
  • M. Rucka
  • K. Wilde
  • J. Chróścielewski

  - Archives of Civil Engineering - Rok 2017

  The paper presents the study of the impact of vibration induced by the movement of the railway rolling stock on the Forum Gdańsk structure. This object is currently under construction and is located over the railway tracks in the vicinity of the Gdańsk Główny and Gdańsk Śródmieście railway stations. The analysis covers the influence of vibrations on the structure itself and on the people within. The in situ measurements on existing...

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• Damage-involved response of two colliding buildings under non-uniform earthquake loading

  Publikacja

  • R. Jankowski

  - Key Engineering Materials - Rok 2014

  Pounding between insufficiently separated buildings, which may result in considerable damage or may even lead to the total collapse of colliding structures, has been repeatedly observed during earthquakes. Earthquake-induced collisions of buildings has been intensively studied applying various structural models. It was assumed in the analyses, however, that the seismic excitation is identical for all structural supports; whereas,...

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• Modeling of medium flow processes in transportation pipelines - the synthesis of their state-space models and the analysis of the mathematical properties of the models for leak detection purposes

  Publikacja

  • M. S. Tatara

  - Rok 2019

  The dissertation concerns the issue of modeling the pipeline flow process under incompressible and isothermal conditions, with a target application to the leak detection and isolation systems. First, an introduction to the model-based process diagnostics is provided, where its basic terminology, tools, and methods are described. In the following chapter, a review of the state of the art in the field of leak detection and isolation...

• Tensile validation tests with failure criteria comparison for various GFRP laminates

  Publikacja

  • T. Wiczenbach
  • T. Ferenc

  - Archives of Civil Engineering - Rok 2021

  The paper studies the mechanical properties of glass fibre reinforced polymers (GFRP) with various types and orientation of reinforcement. Analyzed specimens manufactured in the infusion process are made of polymer vinyl ester resin reinforced with glass fibres. Several samples were examined containing different plies and various fibres orientation [0, 90] or [+45, –45]. To assess the mechanical parameters of laminates, a series...

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• A review on analytical models of brushless permanent magnet machines

  Publikacja

  • A. Abbas
  • A. Iqbal
  • A. Lewicki
  • R. B. Prathap
  • M. Mnzool

  - INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS - Rok 2024

  This study provides an in-depth investigation of the use of analytical and numerical methods in analyzing electrical machines. Although numerical models such as the finite-element method (FEM) can handle complex geometries and saturation effects, they have significant computational burdens, are time-consuming, and are inflexible when it comes to changing machine geometries or input values. Analytical models based on magnetic equivalent...

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• Determination of stepped plate thickness distribution using guided waves and compressed sensing approach

  Publikacja

  • B. Zima

  - MEASUREMENT - Rok 2022

  Guided waves recently have attracted significant interest as a very promising research area. The signals registered by a specially designed sensor network are processed to assess the state of the tested structure. Despite the constant development of novel damage detection algorithms employing guided waves, the phenomenon of wave propagation still needs detailed recognizing and understanding for the further progress of non-destructive...

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• Expedited Trust-Region-Based Design Closure of Antennas by Variable-Resolution EM Simulations

  Publikacja

  • S. Kozieł
  • A. Pietrenko-Dąbrowska
  • L. Leifsson

  - Rok 2021

  The observed growth in the complexity of modern antenna topologies fostered a widespread employment of numerical optimization methods as the primary tools for final adjustment of the system parameters. This is mainly caused by insufficiency of traditional design closure approaches, largely based on parameter sweeping. Reliable evaluation of complex antenna structures requires full-wave electromagnetic (EM) analysis. Yet, EM-driven...

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• DETERMINATION OF SEAKEEPING PERFORMANCE FOR A CASE STUDY VESSEL BY THE STRIP THEORY METHOD

  Publikacja

  • K. Niklas
  • A. Karczewski

  - Polish Maritime Research - Rok 2020

  The increase of seakeeping performance is of particular importance for car and passenger ferries, service ships in the gas and oil extraction industry and offshore wind power farm industry, as well as for special purpose ships (including military applications). In the water areas of the Baltic Sea, North Sea, and Mediterranean Sea, which are characterised by a short and steep wave, the hull shape has a substantial impact on the...

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• Guided wave propagation in diagnostic of steel elements

  Publikacja

  • B. Zima
  • R. Kędra

  - Prace Studentów Politechniki Wrocławskiej. Seria : Konferencje - Rok 2014

  This paper is devoted to numerical investigations of elastic wave propagation in steel elements. The aim of this study is to conduct numerical analysis and experimental investigations on the propagation of elastic waves in steel elements in the context of damage detection. In particular, this paper is devoted to detection of damage occurring in the form of notch or changed thickness. This approach utilized the fact that any discontinuities...

• Guided wave propagation in diagnostic of steel elements

  Publikacja

  • B. Zima
  • R. Kędra

  - Rok 2014

  This paper is devoted to numerical investigations of elastic wave propagation in steel elements. The aim of this study is to conduct numerical analysis and experimental investigations on the propagation of elastic waves in steel elements in the context of damage detection. In particular, this paper is devoted to detection of damage occurring in the form of notch or changed thickness. This approach utilized the fact that any discontinuities...

• Thermal-FSI modeling of flow and heat transfer in a heat exchangerbased on minichanels

  Publikacja

  • S. Kornet
  • P. Ziółkowski
  • P. Jóźwik
  • P. Ziółkowski
  • M. Stajnke
  • J. Badur

  - Journal of Power Technologies - Rok 2017

  In this paper selected numerical modelling problems for an advanced thermal-FSI ("Fluid Solid Interaction") mini-channel heat exchanger model are presented. Special attention is given to the heat transfer between the separated mediums for different mass flows. Similar modelling problems have also been discussed in the literature dedicated to numerical and theoretical modelling problems for typical heat exchangers [1, 2, 3]. Basic...

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• A dynamic vehicle-bridge model based on the modal identification results of an existing EN57 train and bridge spans with non-ballasted tracks

  Publikacja

  • M. Szafrański

  - MECHANICAL SYSTEMS AND SIGNAL PROCESSING - Rok 2021

  This paper addresses the methodology of the bridge-vehicle dynamic model definition based on the free response measurements of an existing train and existing bridge spans. In the case of the railway vehicle, the methodology uses the impulse excitations of a single car by means of the wedge method. In the case of the bridge spans, free responses are collected after the passages of trains. The global modal parameters (frequencies...

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• On the generalized model of shell structures with functional cross-sections

  Publikacja

  • S. Dastjerdi
  • M. Malikan
  • V. Eremeev
  • B. Akgöz
  • Ö. Civalek

  - COMPOSITE STRUCTURES - Rok 2021

  In the present study, a single general formulation has been presented for the analysis of various shell-shaped structures. The proposed model is comprehensive and a variety of theories can be used based on it. The cross-section of the shell structure can be arbitrarily analyzed with the presented equations. In other words, various types of shell structures, including cylindrical, conical, spherical, elliptical, hyperbolic, parabolic,...

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• Morse decompositions for a two-dimensional discrete neuron model (low resolution)

  Dane Badawcze

  open access

  • P. Pilarczyk

  - seria: A database of global dynamics for a two-dimensional discrete neuron model

  This dataset contains selected results of rigorous numerical computations conducted in the framework of the research described in the paper “Topological-numerical analysis of a two-dimensional discrete neuron model” by Paweł Pilarczyk, Justyna Signerska-Rynkowska and Grzegorz Graff. A preprint of this paper is available at https://doi.org/10.48550/arXiv.2209.03443.

• Morse decompositions for a two-dimensional discrete neuron model (limited range)

  Dane Badawcze

  open access

  • P. Pilarczyk

  - seria: A database of global dynamics for a two-dimensional discrete neuron model

  This dataset contains selected results of rigorous numerical computations conducted in the framework of the research described in the paper “Topological-numerical analysis of a two-dimensional discrete neuron model” by Paweł Pilarczyk, Justyna Signerska-Rynkowska and Grzegorz Graff. A preprint of this paper is available at https://doi.org/10.48550/arXiv.2209.03443.

• Morse decompositions for a two-dimensional discrete neuron model (full range)

  Dane Badawcze

  open access

  • P. Pilarczyk

  - seria: A database of global dynamics for a two-dimensional discrete neuron model

  This dataset contains selected results of rigorous numerical computations conducted in the framework of the research described in the paper “Topological-numerical analysis of a two-dimensional discrete neuron model” by Paweł Pilarczyk, Justyna Signerska-Rynkowska and Grzegorz Graff. A preprint of this paper is available at https://doi.org/10.48550/arXiv.2209.03443.

• Experimental investigation and process parameter optimization of sheet metal bending by line heating method

  Publikacja

  • D. Yona

  - Rok 2022

   The present study is concerned with the experimental investigation of sheet metal deforming by line heating method that incorporates the combined effect of traverse speed of the torch, thickness of the sheet metal, and the number of passes of the torch. For the numerical analysis of metal bending by line heating, the