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Number of results: 8
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Abstract

Assessment of the flexural buckling resistance of bisymmetrical I-section beam-columns using FEM is widely discussed in the paper with regard to their imperfect model. The concept of equivalent geometric imperfections is applied in compliance with the so-called Eurocode’s general method. Various imperfection profiles are considered. The global effect of imperfections on the real compression members behaviour is illustrated by the comparison of imperfect beam-columns resistance and the resistance of their perfect counterparts. Numerous FEM simulations with regard to the stability behaviour of laterally and torsionally restrained steel structural elements of hot-rolled wide flange HEB section subjected to both compression and bending about the major or minor principal axes were performed. Geometrically and materially nonlinear analyses, GMNA for perfect structural elements and GMNIA for imperfect ones, preceded by LBA for the initial curvature evaluation of imperfect member configuration prior to loading were carried out. Numerical modelling and simulations were conducted with use of ABAQUS/Standard program. FEM results are compared with those obtained using the Eurocode’s interaction criteria of Method 1 and 2. Concluding remarks with regard to a necessity of equivalent imperfection profiles inclusion in modelling of the in-plane resistance of compression members are presented.

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Authors and Affiliations

M.A. Giżejowski
R.B. Szczerba
M.D. Gajewski
Z. Stachura
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Abstract

Because of clear trend in the world to design lighter plastic products, the phenomenon of creep buckling of visco-elastic solids becomes increasingly important. This paper reports the intermediate results of the research project on loading capability and buckling of plastic containers, carried out in the Laboratory of Mechanical Reliability (LMB) of TU Delft. Based on the earlier developed non-linear visco-elasticity model for engineering plastics, the FE simulation of the delayed in time buckling of plastic strips have been performed as a first step toward the understanding and predicting creepbuckling behaviour of plastic carriers.
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Authors and Affiliations

Jan L. Spoormaker
Ihor D. Skrypnyk
Taras O. Yasylkevych
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Abstract

A SAW gas sensor based on Zinc Oxide (ZnO) piezoelectric substrate is simulated and evaluated for the detection of the dichloromethane (DCM) volatile organic compound (VOC). The study is performed based on the finite element method (FEM) using COMSOL Multiphysics software. The obtained device response using the ZnO substrate is compared to the one using the typical lithium niobate (LiNbO3) piezoelectric substrate. A thin film of polyisobutylene (PIB) membrane is selected to act as the sensing layer. The obtained results reveal a linear behaviour of the resonance frequency downshift (i.e., the sensor sensitivity) versus the investigated gas concentrations varying from 10 ppm to 100 ppm of DCM gas. Additionally, the sensor response is investigated by applying several thicknesses of PIB ranging from 0.3 μm to 1.0 μm. The observed sensor response shows less dependence on the PIB thickness using the ZnO substrate than the LiNbO3 one.
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Authors and Affiliations

Mohamed Moustafa
1
Ghaylen Laouini
2
Tariq Alzoubi
2

  1. Department of Physics, School of Sciences and Engineering, The American University in Cairo, Egypt
  2. College of Engineering and Technology, American University of the Middle East, Kuwait
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Abstract

The paper deals with determination of flexural resistance buckling curves for welded I-section steel members made of high strength steel (S 690). In the paper the previously proposed BF analytical model is used for approximation of FEM results obtained using moderately large deformation shell theory and ABAQUS/Standard software. Final formulation of flexural resistance buckling curves is possible through the use of the Merchant-Rankine-Murzewski approach adopted extensively in the authors’ previous papers. For nonlinear optimization, which is needed for analytical model parameters determination, the Wolfram Mathematica package is used. Obtained results for S 690 steel are presented against the results for S 355 steel.

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Authors and Affiliations

M.D. Gajewski
M.A. Giżejowski
R.B. Szczerba
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Abstract

Switched reluctance motors (SRMs) are still under development to maximise their already proven usefulness.Amagnetic circuit of theSRMcan be made of soft magnetic composites (SMCs). The SMCs are composed of iron powder with dielectric and have a lot of advantages in comparison to commonly used electrical steel. The paper deals with the modelling and analysis of theSRMproduced by Emerson Electric Co. forwashing machines. Numerical calculations and modelling were done using the FEMM 4.2 program. Magnetic flux densities and magnetic flux lines were calculated, as well as electromagnetic torque and inductance for changing the position of a stator to a rotor. The obtained results were compared with other measurement results and are quite similar. The developed numerical model will be used for the project of a motor with an SMC magnetic circuit.

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Authors and Affiliations

Marek Przybylski
ORCID: ORCID
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Abstract

The paper presents a concept and realization of monitoring system for the Silesian Stadium in Chorzow. The idea of the system lies in fusion of structure monitoring with a calibrated numerical FEM model [1]. The inverse problem is solved. On the base of measured selected displacements, the numerical FEM model of the structure combined with iterative method, develops the current snow load distribution. Knowing the load, we can calculate the forces and stresses in each element of the structure and thanks to this we can determine the safety thresholds and asses the owner. Test results and conclusions are presented.

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Authors and Affiliations

K. Zółtowski
M. Drawc
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Abstract

In this paper, the authors present an extension of the scope of the previously conducted research to the full three-dimensional computer simulation (using the finite element method), which takes into account the interaction between: heavy caterpillar tracks system – working platform – weak subsoil. The article presents a computer model considering two caterpillars, resting on elastic-plastic sub-soil, with standard Mohr-Coulomb yield conditions, allowing for computer simulation of the behavior of the system up to achievement of ultimate limit state. The results of the above model are treated as the reference for a simplified Analytical Models of estimating the limit state, which might be used in design procedures. In turn, these Analytical Models are enhancements of previously presented one. The most important results concluding form the Analytical Model are simple interaction formulas, in the space of moments acting on the machine-subsoil system, limiting a domain of safety in given soil conditions.
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Authors and Affiliations

Aleksander Urbański
1
ORCID: ORCID
Mateusz Richter
2
ORCID: ORCID

  1. Cracow University of Technology, Faculty of Environmental Engineering and Energy, ul. Warszawska 24, 31-155 Krakow, Poland
  2. University of Agriculture in Krakow, Department of Rural Building, Al. Mickiewicza 24/28, 59-130 Krakow, Poland
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Abstract

The development of electric vehicles (EV) necessitates the search for new solutions for configuring powertrain systems to increase reliability and efficiency. The modularity of power supplies, converters, and electrical machines is one such solution. Among modular electric machines, dual three-phase (DTP) motors are the most common in high-power drives. To simplify low and medium power drives for EVs based on DTP PM motor, it is proposed to use a BLDC drive and machine of the simplest design – with concentrated windings and surface mounted PMs on the rotor. To study and create such drives, an improved mathematical model of DTP PM machine was developed in this work. It is based on the results of 2D FEM modeling of the magnetic field. According to the developed method, the dependences of the self and mutual inductances between all phase windings from the angle of rotor position and loads of different motor modulus were determined. Based on these inductances, the circuit computer model of DTP PM machine was created in the Matlab/Simulink. It has a high simulation speed and a high level of adequacy, which is confirmed by experimental studies with a mock-up sample of the electric drive system.
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Authors and Affiliations

Ihor Shchur
1
Damian Mazur
2
ORCID: ORCID
Olekcandr Makarchuk
1 3
Ihor Bilyakovskyy
1
Valentyn Turkovskyi
1
Bogdan Kwiatkowski
4
ORCID: ORCID
Dawid Kalandyk
5

  1. Department of Electric Mechatronics and Computer-Controlled Electromechanical Systems, Lviv Polytechnic National University, Lviv 79013, Ukraine
  2. Department of Electrical Engineering and Fundamentals of Computer Science, Rzeszow University of Technology, Rzeszow 35-959, Poland
  3. Faculty of Electrical Engineering, Czestochowa University of Technology, Czestochowa 42-200, Poland
  4. Department of Electrical Engineering and Fundamentals of ComputerScience, Rzeszow University of Technology, Rzeszow 35-959, Poland
  5. Doctoral School of Engineering and Technical Sciences at the Rzeszow University of Technology, Rzeszów 35-959, Poland

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