Wyniki wyszukiwania dla: QUASI-STATIC OPERATION

• Quasi-Static Response

  Publikacja

  • J. Underwood
  • E. Alley
  • J. Andric
  • D. Boote
  • Z. Gao
  • A. Van Hoeve
  • J. Jelovica
  • Y. Kawamura
  • Y. Kim
  • J. Liu... i 5 innych

  - Rok 2022

  Concern for the quasi-static response of ship and offshore structures, as required for safety and serviceability assessments. Attention shall be given to uncertainty quantification of quasi-static load and response analysis approaches, and their limitations, including exact and approximate methods for derivation of different acceptance criteria.

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• Quasi-static finite-element analysis of a skewed microstrip crossover

  Publikacja

  • K. Nyka
  • M. Mrozowski

  - IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS - Rok 2002

  Przedstawiono quasi statyczną analizę skrzyżowania mikroskopowego na podłożu dielektycznym. Mikropaski znajdują się na różnych warstwach układu planarnego i mogą krzyżować się pod dowolnym kątem. Pojemności i indukcyjności obliczane są na podstawie rozkładu potencjałów skalarnych. W sformułowaniu zagadnienia magnestatycznego warunki brzegowe dla potencjału skalarnego wprowadzono za pomocą powierzchni rozcięcia dziedziny analizy....

• Quasi-Static and Dynamic Testing of Carbon Fiber Reinforced Magnesium Composites

  Publikacja

  • Z. Ranachowski
  • P. Ranachowski
  • A. Brodecki
  • M. Kopeć
  • S. Kudela
  • M. Kopec

  - Archives of Metallurgy and Materials - Rok 2020

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• CCM and DCM operation analysis of cascaded quasi-Z-source inverter

  Publikacja

  • D. Vinnikov
  • I. Roasto
  • R. Strzelecki
  • M. Adamowicz

  - Rok 2011

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• Periodic stick-slip deformation of granular material under quasi-static conditions

  Publikacja

  • D. Leśniewska
  • M. Pietrzak
  • M. Nitka
  • J. Tejchman

  - SpringerPlus - Rok 2017

  Artykuł omawia wyniki porównawcze między doświadczeniami z użyciem metody korelacji obrazów cyfrowych (DIC) a symulacjami z użyciem metody elementów dyskretnych (DEM) dla problemu przesuwającej się sztywnej ścianki w piasku. W doświadczeniach zaobserwowano w piasku deformację typu slip-stick, która nie została odtworzona w obliczeniach DEM..

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• Assembling and testing of quasi-static hybrid piezoelectric motor based on electroactive lubrication principle

  Publikacja

  • J. Rouchon
  • D. Harribey
  • D. Tran
  • R. Ryndzionek
  • Ł. Sienkiewicz
  • M. Ronkowski
  • M. Michna
  • G. A. Kostro

  - Archives of Electrical Engineering - Rok 2013

  The presented paper concerns a novel concept of hybrid piezoelectric motor based on electroactive lubrication principle. Its structure is combined of quasi-static and resonance piezoelectric actuators, synchronizing their work to generate the rotary movement. The hybrid motor topology is compared to the existing piezoelectric motors, regarding its field of applications in embedded systems with very high security requirements. The...

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• FE studies of quasi-static mass flow in bins: the polar elasto-plastic approach

  Publikacja

  • J. Tejchman

  - TASK Quarterly - Rok 2003

  Przedstawiono wyniki numerycznej analizy zachowania się materiału sypkiego w silosie podczas przepływu quasi-statycznego. Obliczenia wykonano metodą elementów skończonych na bazie mikropolarnego sprężysto-plastycznego prawa materiałowego.

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• 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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• Mechanical response of human thoracic spine ligaments under quasi-static loading: An experimental study

  Publikacja

  • R. Wolny
  • T. Wiczenbach
  • A. J. Andrzejewska-Sroka
  • J. H. Spodnik

  - Journal of the Mechanical Behavior of Biomedical Materials - Rok 2024

  Purpose This study aimed to investigate the geometrical and mechanical properties of human thoracic spine ligaments subjected to uniaxial quasi-static tensile test. Methods Four human thoracic spines, obtained through a body donation program, were utilized for the study. The anterior longitudinal ligament (ALL), posterior longitudinal ligament (PLL), capsular ligament (CL), ligamenta flava (LF), and the interspinous ligament and...

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• A non-quasi-static small-signal model of the four-terminal MOSFET for radio and microwave frequencies.

  Publikacja

  • W. Kordalski
  • T. Stefański

  - Rok 2002

  W pracy zaprezentowano nowy małosygnałowy model tranzystora MOS, w którymuwzględnia się efekt nasycenia prędkości nośników. Model jest spójny fizycznie i może być stosowany w analizie dowolnej konfiguracji włączenia tranzystora.

• 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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• Micro-modelling of shear localization during quasi-static confined granular flow in silos using DEM

  Publikacja

  • A. Grabowski
  • M. Nitka
  • J. Tejchman

  - COMPUTERS AND GEOTECHNICS - Rok 2021

  The paper deals with the quasi-static confined flow of cohesionless sand in a plane strain model silo with parallel walls and a slowly movable bottom. Numerical modelling was carried out by the discrete element method (DEM) using spheres with contact moments to approximately capture a non-uniform shape of sand particles. Different initial void ratios of sand and silo wall roughness grades were employed. Regular triangular grooves...

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• Application of enhanced elasto-plastic damage models to concrete under quasi-static and dynamic cyclic loading

  Publikacja

  • I. Marzec
  • J. Tejchman

  - Rok 2010

  Artykuł omawia wyniki symulacji zachowania sie elementów betonowych poddanych zginaniu w czasie cyklicznego obciążenia. Do symulacji zastosowano 3 połączone modele sprężysto-plastyczne z degradacją sztywności i z nielokalnym osłabieniem. Wyniki symulacji porównano bezpośrednio z doświadczeniami.

• Modelling of shear zones during quasi-static granular silo flow using material point method (MPM)

  Publikacja

  • J. Krzyżanowski
  • J. Tejchman
  • W. Sołowski
  • M. Wójcik

  - POWDER TECHNOLOGY - Rok 2021

  The paper focuses on confined silo flow of cohesionless sand. The problem considered is a quasi-static flow in a plane strain model silo with parallel walls simulated with the material point method (MPM). The simulation used a non-local hypoplastic constitutive model. Initially, the paper validated the implemented numerical approach with basic element tests and a plane strain compression test. The subsequent MPM calculations for...

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• A non-quasi-static-signal MOSFET model for radio and microware frequencies including spreading gate resistances and capacitaces.

  Publikacja

  • W. Kordalski
  • T. Stefański

  - Rok 2003

  Zaprezentowano nowy, spójny fizycznie nie-quasi-statyczny model małosygnałowy tranzystora MOS słuszny od 0 Hz aż do częstotliwości mikrofalowych. Scharakteryzowano właściwości nowego czterokońcówkowego modelu. Model został zweryfikowany eksperymentalnie aż do częstotliwości 27 GHz.

• Effect of free water on the quasi‑static compression behavior of partially‑saturated concrete with a fully coupled DEM/CFD approach.

  Publikacja

  • M. Krzaczek
  • J. Tejchman
  • M. Nitka

  - GRANULAR MATTER - Rok 2024

  The work aims to numerically investigate the quasi-static response of partially fluid-saturated concrete under two-dimensional uniaxial compression at the mesoscale. We investigated how the impact of free pore fluid content (water and gas) affected the quasi-static strength of concrete. The totally and partially fluid-saturated concrete behavior was simulated using an improved pore-scale hydro-mechanical model based on DEM/CFD....

• INVESTIGATIONS OF QUASI-STATIC VORTEX-STRUCTURES IN 3D SAND SPECIMENS BASED ON DEM AND HELMHOLTZ-HODGE VECTOR FIELD DECOMPOSITION.

  Publikacja

  • J. Kozicki
  • J. Tejchman

  - Photonics and Nanostructures-Fundamentals and Applications - Rok 2017

  Artykuł omawia wyniki numeryczne dotyczące struktur wirowych w materiałach granulowanych w warunkach 3D. Obliczenia wykonano dla ściskania dwuosiowego. W symulacjach wykorzystano metodę elementów dyskretnych i dekompozycję pola wektorowego wg Helmholtza-Hodge’a Struktury wirowe okazały się znakomitym prekursorem lokalizacji odkształceń stycznych w materiałach granulowanych podczas obciążenia.

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• Effect of grain roughness on strength, volume changes, elastic and dissipated energies during quasi-static homogeneous triaxial compression using DEM

  Publikacja

  • J. Kozicki
  • J. Tejchman
  • Z. Mróz

  - GRANULAR MATTER - Rok 2012

  Artykuł omawia wpływ szorstkości ziaren na wytrzymałość, zmiany objętościowe, sprężyste i dysypywane energie podczas jednorodnego quasi-statycznego trójosiowego ściskania. Obliczenia wykonano stosując metodę elementów dyskretnych. W obliczeniach zastosowano różne szorstkości ziaren.

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• Effect of grain roughness on strength, volume changes, elastic and dissipated energies during quasi-static triaxial and biaxial compression using DEM

  Publikacja

  • J. Tejchman
  • J. Kozicki

  - Rok 2012

  Artykuł omawia wpływ szorstkości ziaren na wytrzymałość, zmiany objętościowe, sprężyste i dysypywane energie podczas jednorodnego quasi-statycznego trójosiowego i dwuosiowego ściskania. Obliczenia wykonano stosując metodę elementów dyskretnych. W obliczeniach zastosowano różne szorstkości ziaren. Zbadano różne zjawiska na poziomie ziarna w strefie ścinania.

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• Investigations of quasi-static vortex structures in 2D sand specimen under passive earth pressure conditions based on DEM and Helmholtz-Hodge vector field decomposition.

  Publikacja

  • J. Kozicki
  • J. Tejchman

  - GRANULAR MATTER - Rok 2017

  Artykuł przedstawia wyniki obliczeń quasi-statycznych struktur wirowych w 2-wymiarowej próbce piasku w warunkach pasywnego parcia gruntu. Zastosowano metodę elementów dyskretnych i dekompozycję Helmholtza-Hodge’a pola wektorowego. Stwierdzono bliską zależność między wirami a miejscem powstania strefy lokalizacji odkształceń stycznych.

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• A quasi-2D small-signal MOSFET model - main results

  Publikacja

  • W. Kordalski

  - Rok 2014

  Main results stemming from a new quasi 2D non-quasi-static small-signal four-terminal model of the MOSFET are presented in this work. The model is experimentally verified up to 30 GHz.

• A quasi-2D small-signal MOSFET model - main results

  Publikacja

  • W. Kordalski

  - Elektronika : konstrukcje, technologie, zastosowania - Rok 2014

  Dynamic properties of the MOS transistor under small-signal excitation are determined by kinetic parameters of the carriers injected into the channel, i.e., the low-field mobility, velocity saturation, mobility at the quiescent-point (Q-point), longitudinal electric field in the channel, by dynamic properties of the channel, as well as by an electrical coupling between the perturbed carrier concentration in the channel and the...

• Sensorless field oriented control for five-phase induction motors with third harmonic injection and fault insensitive feature

  Publikacja

  • F. Wilczyński
  • P. Strankowski
  • J. Guziński
  • M. Morawiec
  • A. Lewicki

  - Bulletin of the Polish Academy of Sciences-Technical Sciences - Rok 2019

  The paper presents a solution for sensorless field oriented control (FOC) system for five-phase induction motors with improved rotor flux pattern. In order to obtain the advantages of a third harmonic injection with a quasi-trapezoidal flux shape, two vector models, α1–β1 and α3–β3, were transformed into d1– q1, d3– q3 rotating frames, which correlate to the 1st and 3rd harmonic plane respectively. A linearization approach of the...

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• Static and dynamic concrete calculations: Breakable aggregates in DEM model

  Publikacja

  • M. Nitka

  - Journal of Building Engineering - Rok 2024

  The paper deals with the calculations of a 3-point bending beam under static and dynamic loads. The real microstructure was obtained from laboratory tests using micro-tomography images. The quasi-static results were compared directly with experimental data at both macro and micro levels. Subsequently, higher strain rates were applied to investigate dynamic effects. The study focused on the influence of dynamic loading on the macroscopic...

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• 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...

• Wykorzystanie metody Neldera-Meada do identyfikacji wartości parametrów niequasi-statycznego modelu małosygnałowego tranzystora MOS

  Publikacja

  • D. Trofimowicz
  • W. Kordalski

  - Przegląd Elektrotechniczny - Rok 2015

  W artykule zaprezentowano wyniki zastosowania metody sympleksu Neldera-Meada do ekstrakcji wartości parametrów niequasi-stycznego modelu małosygnałowego tranzystora MOS. Przedstawiono równoważny elektryczny schemat zastępczy i model matematyczny nowego modelu małosygnałowego MOSFETa dla częstotliwości mikrofalowych. Opisano zaimplementowany algorytm i otrzymane rezultaty badań.

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• Discrete Modelling of Micro-structural Phenomena in Granular Shear Zones

  Publikacja

  • M. Nitka
  • J. Tejchman
  • J. Kozicki

  - Rok 2015

  The micro-structure evolution in shear zones in cohesionless sand for quasi-static problems was analyzed with a discrete element method (DEM). The passive sand failure for a very rought retaining wall undergoing horizontal translation towards the sand backfill was discussed. To simulate the behaviour of sand, the spherical discrete element model was used with elements in the form of rigid spheres with contacts moments.

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• The electrical properties mesurements of DIR-SOFC with Ce0.8Fe0.2O2-s functional layer

  Dane Badawcze

  open access

  • B. Bochentyn
  • P. Błaszczak

  - seria: DIR-SOFC

  The dataset includes the electrical properties mesurements of SOFC with Ce0.8Fe0.1O2-s layer. Samples were produced using aqueous soft chemistry methods (microemulsion method) and applied in form of a layer onto the anode of the commercial SOFC. The SOFC was working under biogas feeding at 750oC. The layers were sintered at 1100oC. 

• The electrical properties mesurements of DIR-SOFC with Ce0.8Co0.2O2-s functional layer

  Dane Badawcze

  open access

  • B. Bochentyn
  • P. Błaszczak

  - seria: DIR-SOFC

  The dataset includes the electrical properties mesurements of SOFC with Ce0.8Co0.1O2-s layer. Samples were produced using aqueous soft chemistry methods (microemulsion method) and applied in form of a layer onto the anode of the commercial SOFC. The SOFC was working under biogas feeding at 750oC. The layers were sintered at 1100oC. 

• The electrical properties mesurements of DIR-SOFC with Ce0.8Mn0.2O2-s functional layer

  Dane Badawcze

  open access

  • B. Bochentyn
  • P. Błaszczak

  - seria: DIR-SOFC

  The dataset includes the electrical properties mesurements of SOFC with Ce0.8Mn0.1O2-s layer. Samples were produced using aqueous soft chemistry methods (microemulsion method) and applied in form of a layer onto the anode of the commercial SOFC. The SOFC was working under biogas feeding at 750oC. The layers were sintered at 1100oC. 

• The electrical properties mesurements of DIR-SOFC with Ce0.8Ni0.2O2-s functional layer

  Dane Badawcze

  open access

  • B. Bochentyn
  • P. Błaszczak

  - seria: DIR-SOFC

  The dataset includes the electrical properties mesurements of SOFC with Ce0.8Ni0.1O2-s layer. Samples were produced using aqueous soft chemistry methods (microemulsion method) and applied in form of a layer onto the anode of the commercial SOFC. The SOFC was working under biogas feeding at 750oC. The layers were sintered at 1100oC. 

• The electrical properties mesurements of DIR-SOFC with CeO2-s functional layer

  Dane Badawcze

  open access

  • B. Bochentyn
  • P. Błaszczak

  - seria: DIR-SOFC

  The dataset includes the electrical properties mesurements of SOFC with CeO2-s layer. Samples were produced using aqueous soft chemistry methods (microemulsion method) and applied in form of a layer onto the anode of the commercial SOFC. The SOFC was working under biogas feeding at 750oC. The layers were sintered at 1100oC. 

• The electrical properties mesurements of DIR-SOFC with Ce0.8Cu0.2O2-s functional layer

  Dane Badawcze

  open access

  • B. Bochentyn
  • P. Błaszczak

  - seria: DIR-SOFC

  The dataset includes the electrical properties mesurements of SOFC with Ce0.8Cu0.1O2-s layer. Samples were produced using aqueous soft chemistry methods (microemulsion method) and applied in form of a layer onto the anode of the commercial SOFC. The SOFC was working under biogas feeding at 750oC. The layers were sintered at 1100oC. 

• Interlaboratory Test to Characterize the Cyclic Behavior of Bituminous Interlayers: An Overview of Testing Equipment and Protocols

  Publikacja

  • F. Canestrari
  • T. Attia
  • H. Di Benedetto
  • A. Graziani
  • P. Jaskuła
  • Y. R. Kim
  • M. Maliszewski
  • J. C. Pais
  • C. Petit
  • C. Raab... i 5 innych

  - Rok 2020

  The performance assessment of multi-layered pavements strongly depends on the mechanical behavior of the interface between bituminous layers. So far, comprehensive studies have been carried out mainly using quasi-static laboratory tests focusing on the interlayer shear strength at failure. However, it is generally recognized that cyclic shear testing will lead to the determination of parameters which are more closely linked to...

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• The Impact of Sloshing Liquids on Ship Stability for Various Dimensions of Partly Filled Tanks

  Publikacja

  • P. Krata

  - TransNav - The International Journal on Marine Navigation and Safety of Sea Transportation - Rok 2013

  Liquid sloshing phenomenon taking place in partly filled ships' tanks directly affects the stability of a vessel. However, only static calculations are carried out onboard ships nowadays and static transfer of liquid weight is taken into account in the course of routine stability calculation. The paper is focused on a dynamic heeling moment due to liquid sloshing in tanks onboard ships. A number of numerical simulations of liquid...

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• A Method of Assessment of the Liquid Sloshing Impact on Ship Transverse Stability

  Publikacja

  • P. Krata

  - TransNav - The International Journal on Marine Navigation and Safety of Sea Transportation - Rok 2014

  Liquid sloshing phenomenon taking place in partly filled ships? tanks directly affects the stability of a vessel. However, only static calculations are carried out onboard ships nowadays and static transfer of liquid weight is taken into account in the course of routine stability calculation. The paper is focused on a dynamic heeling moment due to liquid sloshing in tanks onboard ships. The set of numerical simulations of liquid...

  Pełny tekst do pobrania w portalu

• Interlaboratory Test to Characterize the Cyclic Behavior of Bituminous Interlayers: An Overview of Testing Equipment and Protocols

  Publikacja

  • P. Jaskuła
  • D. Ryś
  • F. Canestrari
  • T. Attia
  • H. Di Benedetto
  • A. Graziani
  • Y. R. Kim
  • M. Maliszewski
  • J. C. Pais
  • C. Petit... i 5 innych

  - Rok 2022

  The performance assessment of multi-layered pavements strongly depends on the mechanical behavior of the interface between bituminous layers. So far, comprehensive studies have been carried out mainly using quasi-static laboratory tests focusing on the interlayer shear strength at failure. However, it is generally recognized that cyclic shear testing will lead to the determination of parameters which are more closely linked to...

  Pełny tekst do pobrania w serwisie zewnętrznym

• On the Nonlinea Distortions of Sound and its Coupling with Other Modes in a Gasesous Plasma with Finite Electric Conductivity in a Magnetic Field

  Publikacja

  • A. Perelomova

  - Archives of Acoustics - Rok 2016

  Nonlinear phenomena of the planar and quasi-planar magnetoacoustic waves are considered. We focus on deriving of equations which govern nonlinear excitation of the non-wave motions by the intense sound in initially static gaseous plasma. The plasma is treated as an ideal gas with finite electrical conductivity permeated by a magnetic field orthogonal to the trajectories of gas particles. This introduces dispersion of a flow. Magnetoacoustic...

  Pełny tekst do pobrania w portalu

• An Approach to Mean Path Loss Model Estimation for Off-Body Channels

  Publikacja

  • S. J. Ambroziak
  • K. Turbić
  • L. M. Correia

  - Rok 2017

  This paper presents an approach to estimation of the mean path loss model parameters in off-body Body Area Networks channels. In this approach, the path loss exponent is constrained to a value obtained for the line-of-sight (LoS) propagation in the co-polarised channel, considering a generalised static scenario. The comparison of the goodness of fit between the proposed approach and other approaches, for a set of measurements obtained...

• Hybrid piezoelectric motor based on electroactive lubrication principle

  Publikacja

  • R. Ryndzionek
  • Ł. Sienkiewicz
  • M. Ronkowski
  • J. Rouchon
  • D. Harribey
  • D. Tran

  - Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały - Rok 2012

  A novel conception of hybrid piezoelectric motor is presented in this paper. Proposed conception required synchronised work of quasi-static and resonant piezoelectric actuators that results in a rotary movement. The motor's working principle is explained and the main characteristics are described. Studied topology is compared to the existing piezoelectric motors with regards to its field of applications. The assembling process...

• Buckling analyses of cylindrical metal silos containing bulk solids

  Publikacja

  • M. Wójcik
  • M. Sondej
  • J. Tejchman

  - Rok 2013

  The paper presents quasi-static 3D buckling analysis results of thin-walled cylindrical metal silos with and without bulk solids. The behaviour of the bulk solid was described with a hypoplastic constitutive model. Non-linear analyses with geometric and material non-linearity were performed with a perfect and an imperfect silo shell. Different initial geometric imperfections were considered. The influence of internally stored bulk...

• Bending test results of first metatarsophalangeal joint after arthrodesis with medially or dorsally positioned locking plate and lag screw.

  Dane Badawcze

  open access

  • K. Daszkiewicz
  • M. Rucka
  • A. Andrzejewska-Sroka
  • K. Czuraj
  • P. Łuczkiewicz

  The Dataset contains the results of the bending test of first metatarsophalangeal (MTP1) joint specimens after arthrodesis.

• Piotr Płotka dr hab. inż.

  Osoby

  Wydział Elektroniki, Telekomunikacji i Informatyki, Katedra Systemów Mikroelektronicznych

  Piotr Płotka otrzymał tytuł zawodowy magistra inżyniera w 1976 r., a stopień doktora w dyscyplinie elektronika w 1985 r. – nadane przez Wydział Elektroniki Telekomunikacji i Informatyki Politechniki Gdańskiej. W 2008 r. otrzymał stopień doktora habilitowanego, także w dyscyplinie elektronika, nadany przez Instytut Technologii Elektronowej w Warszawie. Od 1977 r. pracował w Akademii Techniczno-Rolniczej w Bydgoszczy, a od 1981...

• Highly Dissipative Materials for Damage Protection against Earthquake-Induced Structural Pounding

  Publikacja

  • A. M. Stręk
  • N. Lasowicz
  • A. Kwiecień
  • B. Zając
  • R. Jankowski

  - Materials - Rok 2021

  It is a common situation that seismic excitations may lead to collisions between adjacent civil engineering structures. This phenomenon, called earthquake-induced structural pounding, may result in serious damage or even the total collapse of the colliding structures. Filling the gap between two buildings erected close to one another by using visco-elastic materials can be considered to be one of the most effective methods to avoid...

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• Electromagnetic-based derivation of fractional-order circuit theory

  Publikacja

  • T. Stefański
  • J. Gulgowski

  - Communications in Nonlinear Science and Numerical Simulation - Rok 2019

  In this paper, foundations of the fractional-order circuit theory are revisited. Although many papers have been devoted to fractional-order modelling of electrical circuits, there are relatively few foundations for such an approach. Therefore, we derive fractional-order lumped-element equations for capacitors, inductors and resistors, as well as Kirchhoff’s voltage and current laws using quasi-static approximations of fractional-order...

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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...

• FE analysis of a coupled energetic-statistical size effect in plain concrete beams with varying material properties.

  Publikacja

  • E. Korol
  • J. Tejchman

  - Rok 2016

  The numerical FE investigations of a coupled energetic-statistical size effect in unnotched concrete beams of similar geometry under quasi-static three point bending were performed within elasto-plasticity with non-local softening. The stochastic FE analyses were carried out with three different beam sizes. Deterministic calculations were performed with the uniform distribution of a uniaxial tensile strength. In statistical calculations...

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• Comparative study of numerical modelling and experimental investigation for vessel-docking operations

  Publikacja

  • X. Wen
  • J. Zhang
  • M. C. Ong
  • A. Kniat

  - MARINE STRUCTURES - Rok 2024

  A comparative study between numerical modelling and experimental investigation is performed to validate the developed numerical method for simulating floating dock operations with a vessel on board. Both model-scale and full-scale experimental tests are performed on floating docks with a vessel on board, and the draughts using draught meters, floating positions and bending of the floating dock are measured. The present numerical...

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• NONSTRUCTURAL STIFFNESS ASSESSMENT IN INSTRUMENTED STEEL BUILDINGS

  Publikacja

  • T. Falborski
  • A. Kanvinde

  - Rok 2024

  Lateral stiffness of nonstructural components may significantly influence the initial stiffness of the entire structure and consequently alter its dynamic characteristics. While methods for simulating structural members are well-established, approaches for modeling nonstructural components that also participate in seismic response are notably less developed. In this paper a simplified, physically-intuitive approach for estimating...

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• MODELLING OF CONCRETE FRACTURE AT AGGREGATE LEVEL USING DEM BASED ON X-RAY mu CT IMAGES OF INTERNAL STRUCTURE

  Publikacja

  • M. Nitka
  • J. Tejchman

  - Rok 2015

  The paper describes two-dimensional meso-scale numerical results of fracture in notched concrete beams under quasi-static three-point bending. Concrete was modelled as a random heterogeneous 4-phase material composed of aggregate particles, cement matrix, interfacial transitional zones (ITZs) and air voids. As a numerical approach, the discrete element method (DEM) was used. The concrete micro-structure in calculations was directly...

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