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Testing virtual prototype of a new product in two simulation environments

Krzysztof Łukaszewicz
Management and Production Engineering Review | 2019 | vol. 10 | No 3 | DOI: 10.24425/mper.2019.130505
Keywords CAD FEA dynamic simulation virtual prototyping
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Abstract

This paper is a case study conducted to present an approach to the process of designing

new products using virtual prototyping. During the first stage of research a digital geometric

model of the vehicle was created. Secondly it underwent a series of tests utilising the

multibody system method in order to determine the forces and displacements in selected

construction nodes of the vehicle during its movement on an uneven surface. In consequence

the most dangerous case of loads was identified. The obtained results were used to conduct

detailed strength testing of the bicycle frame and changes its geometry. For the purposes

of this case study two FEA software environments (Inventor and SolidWorks) were used. It

has been confirmed that using method allows to implement the process of creating a new

product more effectively as well as to assess the influence of the conditions of its usage more

efficiently. It was stated that using of different software environments increases the complexity

of the technical process of production preparation but at the same time increases the

certainty of prototype testing. The presented example of simulation calculations made for

the bicycle can be considered as a useful method for calculating other prototypes with high

complexity of construction due to its systematized character of chosen conditions and testing

procedure. It allows to verify the correctness of construction, functionality and perform

many analyses, which can contribute to the elimination of possible errors as early as at the

construction stage.

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Authors and Affiliations

Krzysztof Łukaszewicz

OPTIMAL STATE ESTIMATION AND ON-LINE OPTIMISATION OF A BIOCHEMICAL REACTOR

Eswari Jujjavarapu Satya Polumati Anand Chimmiri Venkateswarlu
Chemical and Process Engineering | 2013 | No 4 December | 449-462 | DOI: 10.2478/cpe-2013-0037
Keywords bioprocess monitoring dynamic simulation model identification optimisation control
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Abstract

An on-line optimising control strategy involving a two level extended Kalman filter (EKF) for dynamic model identification and a functional conjugate gradient method for determining optimal operating condition is proposed and applied to a biochemical reactor. The optimiser incorporates the identified model and determines the optimal operating condition while maximising the process performance. This strategy is computationally advantageous as it involves separate estimation of states and process parameters in reduced dimensions. In addition to assisting on-line dynamic optimisation, the estimated time varying uncertain process parameter information can also be useful for continuous monitoring of the process. This strategy ensures that the biochemical reactor is operated at the optimal operation while taking care of the disturbances that are encountered during operation. The simulation results demonstrate the usefulness of the two level EKF assisted dynamic optimizer for on-line optimising control of uncertain nonlinear biochemical systems.

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Authors and Affiliations

Eswari Jujjavarapu Satya
Polumati Anand
Chimmiri Venkateswarlu

A field-circuit model of the hybrid magnetic bearing

Dawid Wajnert
Archive of Mechanical Engineering | 2019 | vol. 66 | No 2 | 191-208 | DOI: 10.24425/ame.2019.128444
Keywords dynamic simulation field-circuit model hybrid magnetic bearing
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Abstract

The paper presents a simulation model of the hybrid magnetic bearing dedicated to simulations of transient state. The proposed field-circuit model is composed of two components. The first part constitutes a set of ordinary differential equations that describes electrical circuits and mechanics. The second part of the simulation model consists of parameters such as magnetic forces, dynamic inductances and velocity-induced voltages obtained from the 3D finite element analysis. The MATLAB/Simulnik softwarewas used to implement the simulation model with the required control system. The proposed field-circuit model was validated by comparison of time responses with the prototype of the hybrid magnetic bearing.

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Bibliography

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[8] J. Zimon, B. Tomczuk, and D. Wajnert. Field-circuit modeling of AMB system for various speeds of the rotor. Journal of Vibroengineering, 14(1):165–170, 2012. https://www.jvejournals.com/article/10565/pdf.
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[13] B. Polajzer, G. Stumberger, J. Ritonja, and D. Dolinar. Variations of active magnetic bearings linearized model parameters analyzed by finite element computation. IEEE Transactions on Magnetics, 44(6):1534–1537, 2008. doi: 10.1109/TMAG.2007.916650.
[14] B. Tomczuk and D. Koteras. 3D Field Analysis in 3-phase amorphous modular transformer under increased frequency operation. Archives of Electrical Engineering, 64(1):119–127, 2015. doi: 10.1515/aee-2015-0011.
[15] Z. Badics and Z.J. Cendes. Source field modeling by mesh incidence matrices. IEEE Transactions on Magnetics, 43(4):1241–1244, 2007. doi: 10.1109/TMAG.2006.890967.
[16] D. Wajnert and B. Tomczuk. Simulation for the determination of the hybrid magnetic bearing’s electromagnetic parameters. Przegląd Elektrotechniczny, 93(2):157–160, 2017. http://pe.org.pl/articles/2017/2/34.pdf.
[17] A. Mystkowski. Energy saving robust control of active magnetic bearings in flywheel. Acta Mechanica et Automatica, 6(3):72–76, 2012.
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[20] S. Myburgh, G. von Schoor, and E. O. Ranft. A non-linear simulation model of an active magnetic bearings supported rotor system. In Proceedings of The XIX International Conference on Electrical Machines (ICEM 2010), pages 1–6, Rome, Italy, 6–8 September 2010. doi: 10.1109/ICELMACH.2010.5607982.
[21] Z. Gosiewski and A. Mystkowski. Robust control of active magnetic suspension: Analytical and experimental results. Mechanical Systems and Signal Processing, 22(6):1297–1303, 2008. doi: 10.1016/j.ymssp.2007.08.005.
[22] A. Mystkowski. Robust control of vibration of the magnetically suspended rotor. Ph.D. Thesis, AGH University of Science and Technology, Cracow, Poland, 2007 (in Polish).
[23] A. Piłat. Control of magnetic levitation systems. Ph.D. Thesis, AGH University of Science and Technology, Cracow, Poland, 2002 (in Polish).
[24] Z. Gosiewski. Magnetic bearings for rotating machines. Controlling and research. Biblioteka Naukowa Instytutu Lotnictwa, 1999 (in Polish).
[25] K. Falkowski. The development of the laboratory model of the gyroscope with the magnetically levitating rotor and its research. Ph.D. Thesis, Warsaw University of Technology, Warsaw, Poland, 1999 (in Polish).
[26] G.F. Franklin, J.D. Powell and A. Emami-Naeini. Feedback control of dynamic systems. Prentice Hall, 2002.
[27] S. Szymaniec. “Measurement paths” used to measure relative vibrations in electric machines. Zeszyty Problemowe – Maszyny Elektryczne, 81:55–60, 2009 (in Polish).
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Authors and Affiliations

Dawid Wajnert
1
  1. Opole University of Technology, Department of Electrical Engineering and Mechatronics, Opole, Poland.

Microscopic simulation of pedestrian traffic in urban environment under epidemic conditions

Mateusz Paciorek Damian Poklewski-Koziełł Kinga Racoń-Leja Aleksander Byrski Mateusz Gyurkovich Wojciech Turek
Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 4 | e137725 | DOI: 10.24425/bpasts.2021.137725
Keywords epidemic modeling pedestrian dynamics simulation urban environment
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Abstract

The ongoing period of the pandemic makes everybody focused on the matters related to fighting this immense problem posed to the societies worldwide. The governments deal with the threat by publishing regulations which should allow to mitigate the pandemic, walking on thin ice as the decision makers do not always know how to properly respond to the threat in order to save people. Computer-based simulations of e.g. parts of the city or rural area should provide significant help, however, there are some requirements to fulfill. The simulation should be verifiable, supported by the urban research and it should be possible to run it in appropriate scale. Thus in this paper we present an interdisciplinary work of urban researchers and computer scientists, proposing a scalable, HPC-grade model of simulation, which was tested in a real scenario and may be further used to extend our knowledge about epidemic spread and the results of its counteracting methods. The paper shows the relevant state of the art, discusses the micro-scale simulation model, sketches out the elements of its implementation and provides tangible results gathered for a part of the city of Krakow, Poland.
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Authors and Affiliations

Mateusz Paciorek
1
ORCID: ORCID
Damian Poklewski-Koziełł
2
ORCID: ORCID
Kinga Racoń-Leja
2
ORCID: ORCID
Aleksander Byrski
1
ORCID: ORCID
Mateusz Gyurkovich
2
ORCID: ORCID
Wojciech Turek
1
ORCID: ORCID
  1. AGH University of Science and Technology, al. Adama Mickiewicza 30, 30-059 Krakow, Poland
  2. Cracow University of Technology, ul. Warszawska 24, 31-155 Krakow, Poland

Constitutive modelling and numerical implementation of SMA material with internal loops

A. Zbiciak K. Wasilewski
Archives of Civil Engineering | 2018 | Vol. 64 | No 4/I | 211-232
Keywords Shape Memory Alloys Rheological model Dynamic simulation
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Abstract

The article presents a constitutive model for Shape Memory Alloys (SMA) along with result of dynamic simulations of SMA model. The applications of devices incorporating SMA in civil engineering focus mostly on mitigation of the seismic hazard effects in new-build and historical buildings or improvement of fatigue resilience. The unique properties of SMA, such as shape memory effect and superelasticity give promising results for such applications. The presented model includes additional phenomenon of SMA – internal loops. The paper shows the method of formulation of physical relations of SMA based on special rheological structure, which includes modified Kepes’s model. This rheological element, introduced as dual-phase plasticity body, is given in the context of martensite phase transformation. One of the advantages of such an approach is a possibility of formulation of constitutive relationships as a set of explicit differential equations. The application of the model is demonstrated on example of dynamic simulations of three dimensional finite element subjected to dynamic excitation.

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Authors and Affiliations

A. Zbiciak
K. Wasilewski

Simulation and numerical analysis of a rectangular pipe with transversal baffle – comparison between zigzag and plane baffles

Chafika Zidani Boumédiènne Benyoucef Faouzi Didi Nabila Guendouz
Archives of Thermodynamics | 2020 | vol. 41 | No 4 | 269-283 | DOI: 10.24425/ather.2020.135988
Keywords Dynamic simulation turbulent flow Forced convection Rectangular pipe Baffle
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Abstract

The airflow through a two-dimensional horizontal rectangular cross-section channel in the presence of two baffles has been numerically examined and analyzed in the steady turbulent regime. The baffles were of the zig-zag type or plane one. The calculations are based on the finite volume approach and the average Navier–Stokes equations along with the energy equation, have been solved using the SIMPLE algorithm. The nonuniform structured quadrilateral-type element mesh is used in this study. The fluid flow patterns represented for Reynolds numbers based on the hydraulic diameter of the channel ranging from 5000 to 20 000. Effects of various Reynolds number values on flow fields, dimensionless axial velocity profiles, as well as local and average friction coefficients in the test channel is presented. The obtained results show that the flow structure is characterized by strong deformations and large recirculation regions. In general, the fluid velocity and skin friction loss rise with the increase in the flow rate and hence the Reynolds number.

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Authors and Affiliations

Chafika Zidani
Boumédiènne Benyoucef
Faouzi Didi
Nabila Guendouz

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