Search results for: amo model

Evaluation Of Single Pole Auto-Reclosing Effectiveness With Nonlinear Secondary Arc Model

Publication

- Year 2014

The paper discusses two evaluation methods of single pole auto-reclosing process effectiveness in HV transmission lines. Secondary arc current and recovery voltage results obtained by load flow calculation are compared to the results obtained by the time domain simulations. Moreover, a non-linear secondary arc implementation is presented. The authors indicate, that precise representation of secondary electric arc leads to more...

Hydrodynamiczny model dolnej Wisły z uwzględnieniem koncepcji kaskady stopni piętrzących

Publication

- Year 2014

Praca została wykonana w ramach usług doradztwa świadczonych przez Politechnikę Gdańską na rzecz ENERGA SA. Jej celem było określenie, na podstawie obliczeń i symulacji numerycznych, hydraulicznych skutków potencjalnej budowy kaskady stopni piętrzących na dolnej Wiśle, to jest na odcinku rzeki od ujścia Narwi do morza. Przedmiotem zlecenia było wykonanie numerycznego modelu hydraulicznego Doliny Dolnej Wisły z uwzględnieniem koncepcji...

Model of Risk Assessment (MORA) concept for the investment part of urban regeneration projects

Publication

- Year 2014

The main goal of this paper is presentation of the model concept (MORA) that will be used to control level of risk and manage technical risk in investment projects in the area of urban regeneration risk management.

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Assessment of damage causes of a 17 m long wind turbine blade model

Publication

- Year 2016

The subject matter is to verify the stiffness of the steel supporting structure and assess the causes of cracks in the 17 m long wind turbine blade model

EMPIRYCZNY MODEL TŁUMIENIA PROPAGACYJNEGO DLA SIECI WBAN TYPU OFF-BODY

Publication

S. J. Ambroziak
K. Turbić
C. Oliveira
L. M. Correia
R. Katulski

- Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Year 2016

W referacie przedstawiono wąskopasmowy empiryczny model tłumienia propagacyjnego dla sieci WBAN pracujących w środowisku wewnątrzbudynkowym przy częstotliwości 2,45 GHz.

A new approach to determination of the two-mass model parameters of railway current collector

Publication

- Technika Transportu Szynowego - Year 2015

The paper presents two mathematical models of railway current collectors both with two degrees of freedom. The first one, hereinafter Pantograph Articulated Model (PAM), has one degree of freedom in rotational motion and the second degree of freedom in translational motion. The second model, called henceforth as Pantograph Reference Model (PRM), has both degrees of freedom in translational motion. Differential equations of the...

Turbulence model evaluation for numerical modelling of turbulent flow and heat transfer of nanofluids

Publication

H. Boertz
A. Baars
J. Cieśliński
S. Smoleń

- Applied Mechanics and Materials - Year 2016

In this work, Nusselt number and friction factor are calculated numerically for turbulent pipe flow (Reynolds number between 6000 and 12000) with constant heat flux boundary condition using nanofluids. The nanofluid is modelled with the single-phase approach and the simulation results are compared with experimental data. Ethylene glycol and water, 60:40 EG/W mass ratio, as base fluid and SiO2 nanoparticles are used as nanofluid...

An Intergrated Model of Motion, Steering, Positioning and Stabilization of an Unmanned Autonomous Maritime Vehicle

Publication

M. K. Gerigk

- TransNav - The International Journal on Marine Navigation and Safety of Sea Transportation - Year 2015

In the paper the aim of an interdisciplinary research is presented. The research method is introduced. An object the unmanned autonomous maritime vehicle is briefly described. The key research problem concerns a combined model of the vehicle motion including the loads of lift and hydrodynamic nature. The model takes into account the gravity and displacement forces, resistance and thrust forces, lift and other hydrodynamic forces....

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Synchronous generator model taking into account the non-uniform saturation of the pole shoes

Publication

- Year 2014

For the evaluation of modern electric power systems with regard to their behavior, weight, and reliability a novel modeling and simulation tools have been developed. The paper presents circuit model of synchronous generator taking into account both the non-sinusoidal distribution of the stator and rotor winding, and non-uniform saturation of the pole shoes. This model is suitable for simulation of both salient and no-salient pole...

A Taxonomy of Model-Based Testing for Embedded Systems from Multiple Industry Domains

Publication

J. Zander
P. J. Mosterman

- Year 2012

This chapter provides a taxonomy of Model-Based Testing (MBT) based on the approaches that are presented throughout this book as well as in the related literature. The techniques for testing are categorized using a number of dimensions to familiarize the reader with the terminology used throughout the chapters that follow. In this chapter, after a brief introduction, a general definition of MBT and related work on available MBT...

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Integrated Control in High-Speed Networks Using Constrained Model Predictive Control

Publication

M. Brdyś
.. Mwandosya
M. Sekela

- Year 2013

This paper studies congestion control in high-speed communication networks using Model Predictive Control (MPC). Network traffic is assumed to consist of best-effort and priority traffic sources. An integrated controller consisting of two control parts is designed. The controller calculates the capacity for priority sources and the input rate of best-effort sources. MPC is desirable as it can take into account the constraints on...

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Softly Switched Robustly Feasible Model Predictive Control for Nonlinear Network Systems

Publication

M. Brdyś
T. Vu Nam

- Year 2013

It is common that an efficient constrained plant operation under full range of disturbance inputs require meeting different sets of control objectives. This calls for application of model predictive controllers each of them being best fit into specific operating conditions. It further requires that not only designing robustly feasible model predictive controllers is needed to satisfy the real plant state/output constraints, but...

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Representation of magnetic hysteresis in tape wound core using feedback Preisach model

Publication

A. Wilk

- Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej - Year 2013

This paper presents a mathematical model for the hysteresis phenomenon in ferromagnetic tape wound core. The feedback scalar Preisach model of hysteresis is used to simulate magnetic behavior of the grain oriented silicon strip of ET114-27 type. Determination of B-H hysteretic curve is based on measurement of the initial magnetization curve and the main hysteresis loop. The Preisach distribution function (PDF) of ET114-27 material...

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Experimental determination of dynamic properties of cylindrical steel tank model filled with liquid

Publication

- Technology and Art - Year 2012

In technical branches, such as chemical or petroleum industries, cylindrical steel tanks are essential structures used for storage of liquid products. Any failure might have disastrous consequences, therefore their safety and reliability is essential. The aim of the present paper is to show the results of the experimental study which has been conducted on a scaled model of a real tank used in Poland. The investigation was carried...

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Macro-elements and Model Order Reduction for Efficient Three-Dimensional FEM Analysis

Publication

- Year 2012

An efficient model order reduction (MOR) methodology for three dimensional vector finite element method (FEM) is developed to accelerate simulations of the structures containing features that cause strong variations of mesh density. As the result of presented algorithm, FEM subsystems of equations corresponding to the selected refined region are converted into a very compact sets of linear equations, called macro-elements.Numerical...

Fast Low-fidelity Wing Aerodynamics Model for Surrogate-Based Shape Optimization

Publication

- Procedia Computer Science - Year 2014

Variable-fidelity optimization (VFO) can be efficient in terms of the computational cost when compared with traditional approaches, such as gradient-based methods with adjoint sensitivity information. In variable-fidelity methods, the directoptimization of the expensive high-fidelity model is replaced by iterative re-optimization of a physics-based surrogate model, which is constructed from a corrected low-fidelity model. The success...

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A new approach to determination of the two-mass model parameters of railway current collector

Publication

- Year 2015

The paper presents two mathematical models of railway current collectors both with two degrees of freedom. The first one, hereinafter Pantograph Articulated Model (PAM), has one degree of freedom in rotational motion and the second degree of freedom in translational motion. The second model, called henceforth as Pantograph Reference Model (PRM), has both degrees of freedom in translational motion. Differential equations of the...

Developing Methodology for Model Tests of Floating Platforms in Low -Depth Towing Tank

Publication

- Archives of Civil and Mechanical Engineering - Year 2016

The paper presents two different methods of physical modeling of semi-submersible platform mooring system for research in low depth towing tank. The tested model was made in the scale of 1:100 resembling the "Thunder Horse" platform moored in the Gulf of Mexico at a depth of 1,920 m. Its mooring system consisted of 16 semi-taut mooring lines (chain-wire-chain) spaced starshape and attached at the bottom to suction piles. The tests...

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Developing a methodology for model tests of floating platforms in a towing tank of low depth

Publication

- Year 2014

The paper presents two ways to mooring model of semi-submersible platform for research in the small depth towing pool. The tested model was made in the likeness of 1:100 Thunder Horse platform moored in the Gulf of Mexico at a depth of 1,920 m. Its mooring system consisted of 16 semi-taut mooring lines (chain-wire-chain) spaced Star-shape and attached at the bottom to the suction piles. The tests were performed in the towing pool...

Model DEA do oceny efektywności funkcjonowania publicznych uniwersytetów w Polsce

Publication

A. Szuwarzyński

- PRACE NAUKOWE UNIWERSYTETU EKONOMICZNEGO WE WROCŁAWIU - Year 2014

Publiczne szkolnictwo wyższe w Polsce, wziąwszy pod uwagę zagrożenia wynikające z sytuacji demograficznej, wymaga analizowania efektywności jego funkcjonowania. W artykule przedstawiono model do pomiaru i oceny efektywności uniwersytetów, uwzględniając pięć podstawowych obszarów ich działalności: badań, rozwoju kadry, dydak-tyki, jakości i finansowania. Zastosowano metodę Data Envelopment Analysis (DEA). Wadą konwencjonalnych modeli...

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Comparative model tests of SDP and CFA pile groups in non-cohesive soil

Publication

- Studia Geotechnica et Mechanica - Year 2014

The research topic relates to the subject of deep foundations supported on continuous flight auger (CFA) piles and screw displacement piles (SDP). The authors have decided to conduct model tests of foundations supported on the group of piles mentioned above and also the tests of the same piles working alone. The tests are ongoing in Geotechnical Laboratory of Gdańsk University of Technology. The description of test procedure, interpretation...

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COMPARATIVE ANALYSIS OF THE RESULTS OF GAS FLOW IN A LABYRINTH SEAL FOR A NUMERICAL AND THEORETICAL MODEL

Publication

- Journal of Polish CIMEEAC - Year 2014

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Tribological and nanoscale research on model friction couples intended for hip joint prostheses

Publication

M. Kalbarczyk
R. Michalczewski
W. Piekoszewski
M. Szczerek
R. Michalczewski

- Tribology-Materials Surfaces & Interfaces - Year 2009

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Precision surface characterization for finish cylindrical milling with dynamic tool displacements model

Publication

S. Wojciechowski
P. Twardowski
M. Pelic
R. Maruda
S. Barrans
G. Krolczyk

- PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISIONENGINEERING AND NANOTECHNOLOGY - Year 2016

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Model przepływu wód podziemnych w rejonie tunelu pod Martwą Wisłą

Publication

B. Jaworska-Szulc

- Biuletyn Państwowego Instytutu Geologicznego - Year 2011

Badania modelowe zostały wykonane w celu określenia wpływu wód podziemnych na tunel drążony w obrębie plejstoceńsko-holoceńskiej warstwy wodonośnej. Z drugiej strony ważne było ustalenie wpływu tunelu na układ ciśnień, warunki przepływu i zasoby czwartorzędowego piętra wodonośnego w sąsiedztwie inwestycji. Wyniki obliczeń pokazują, że tunel w bardzo niewielkim stopniu wpływa na przepływ wód podziemnych. W bilansie przepływu wód...