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001-es BibID:BIBFORM099887
035-os BibID:(cikkazonosító)1057 (Scopus)85123110884 (WOS)000754950800001
Első szerző:File Máté
Cím:Optical Investigation of the Limits of Modeling the Nonlinear Elastic Behavior of PA6 Using Linear Elastic Material Models / Máté File, Tamás Mankovits, Dávid Huri
Dátum:2022
ISSN:2076-3417
Megjegyzések:Featured Application In the design of engineering polymeric products, the detailed finite element investigation is indispensable. In most cases, polymeric products are investigated with multilinear material models over the entire stress-strain range. The definition of these material models requires material parameters, which must be obtained through time and cost demanding laboratory measurements. For some applications, such as quasi-static loading, it would be sufficient to use a linear elastic material model, the material constants of which can be obtained quickly. This article can help designers to apply the right material model as the linear elastic material model can be used until the 0.96% strain value in the case of the PA6 material with sufficient accuracy. One of the most critical issues during polymer finite element simulations is the selection of the proper material models. The widely used and accepted multilinear material models require load case-specific material tests, which are time and cost demanding. Data for these characteristics must be acquired by standardized measurements. On the other hand, the parameters required to create a linear elastic material model in most cases are easy to obtain, and the establishment of the model is a shorter process. This research is aimed to provide information to engineers about the possibility of modeling the nonlinear elastic materials by using linear elastic material models and about the limits of such models. To create the most accurate material models, laboratory measurements were performed on polyamide (PA6) material, which is a widely used raw material in the industry. Test specimens were manufactured to obtain material constants according to the ISO 527-2 standard, and for validating the effectiveness of the applied material models, three different tensile specimens were created, which were tested under quasi-static loading in the elastic region. A comprehensive finite element investigation was performed, and the numerical results were then compared to laboratory measurements using the GOM Aramis digital image correlation (DIC) system. By comparing the optically measured strain data to the numerical results, it was determined that the nonlinear elastic materials can be modeled using linear elastic models in a well identifiable strain range with sufficient accuracy.
Tárgyszavak:Műszaki tudományok Anyagtudományok és technológiák idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
polyamide 6
finite element analysis
digital image correlation
material model fitting
Megjelenés:Applied Sciences-Basel. - 12 : 3 (2022), p. 1-16. -
További szerzők:Mankovits Tamás (1981-) (gépészmérnök) Huri Dávid (1990-) (gépészmérnök)
Internet cím:DOI
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2.

001-es BibID:BIBFORM102153
035-os BibID:(Scopus)85131553351 (cikkazonosító)5451 (WOS)000809194500001
Első szerző:Huri Dávid (gépészmérnök)
Cím:Surrogate Model-Based Parameter Tuning of Simulated Annealing Algorithm for the Shape Optimization of Automotive Rubber Bumpers / Dávid Huri, Tamás Mankovits
Dátum:2022
ISSN:2076-3417
Megjegyzések:Featured Application The developed surrogate model-based parameter tuning method of the simulated annealing algorithm is suitable for solving not only numerical simulation optimization problems but also other computationally intensive model-driven optimizations. A design engineer has to deal with increasingly complex design tasks on a daily basis, for which the available design time is shrinking. Market competitiveness can be improved by using optimization if the design process can be automated. If there is limited information about the behavior of the objective function, global search methods such as simulated annealing (SA) should be used. This algorithm requires the selection of a number of parameters based on the task. A procedure for reducing the time spent on tuning the SA algorithm for computationally expensive, simulation-driven optimization tasks was developed. The applicability of the method was demonstrated by solving a shape optimization problem of a rubber bumper built into air spring structures of lorries. Due to the time-consuming objective function call, a support vector regression (SVR) surrogate model was used to test the performance of the optimization algorithm. To perform the SVR training, samples were taken using the maximin Latin hypercube design. The SA algorithm with an adaptive search space and different cooling schedules was implemented. Subsequently, the SA parameters were fine-tuned using the trained SVR surrogate model. An optimal design was found using the adapted SA algorithm with negligible error from a technical aspect.
Tárgyszavak:Műszaki tudományok Anyagtudományok és technológiák idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
finite element analysis
hyperelastic material model
support vector regression
engineering optimization
simulated annealing
parameter tuning
Megjelenés:Applied Sciences-Basel. - 12 : 11 (2022), p. 1-22. -
További szerzők:Mankovits Tamás (1981-) (gépészmérnök)
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DOI
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3.

001-es BibID:BIBFORM085890
035-os BibID:(cikkazonosító)3584 (WOS)000541440000245 (Scopus)85085608229
Első szerző:Huri Dávid (gépészmérnök)
Cím:Parameter Selection of Local Search Algorithm for Design Optimization of Automotive Rubber Bumper / Dávid Huri, Tamás Mankovits
Dátum:2020
ISSN:2076-3417
Tárgyszavak:Műszaki tudományok Anyagtudományok és technológiák idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Applied Sciences-Basel. - 10 : 10 (2020), p. 1-16. -
További szerzők:Mankovits Tamás (1981-) (gépészmérnök)
Internet cím:DOI
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4.

001-es BibID:BIBFORM106246
035-os BibID:(WoS)000916877000001 (Scopus)85146591508
Első szerző:Kertész József (járműmérnök)
Cím:Al-Foam Compression Tests in Parallel and Serial Concepts / József Kertész, Máté File, Zoltán Nyikes, Tünde Anna Kovács, László Tóth
Dátum:2023
ISSN:2076-3417
Megjegyzések:Taking into consideration the additional weight of a vehicle, today`s requirements can only be met using new materials and designs. The application of metal foam is one of the most promising methods of enhancing the impact energy absorption ability of the crumple zone. The energy-absorbing capacity of thin-walled structures filled with metal foams during compression can be notably improved, which results in lower loading on the passengers. The main goal of our research is to develop a new design that is suited to absorb more impact energy while taking into consideration weight optimization. The authors wanted to unveil the effect of the inhomogeneous filler material in these thin-walled structures. Therefore, the present study investigates the compression test of two metal foams of different densities, in different ways. In the first section, the foams were compressed independently from each other by a recording of a stress-strain diagram. After the single compression, the foams were loaded together, first in parallel, and subsequently in a serial scheme. The study aimed to reveal the effect of the parallel and serial compression scheme focusing on the sum of impact energy absorption.
Tárgyszavak:Műszaki tudományok Anyagtudományok és technológiák idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
aluminum foam
crumple zone
passive safety system
serial compression
Megjelenés:Applied Sciences-Basel. - 13 : 2 (2023), p. 1-14. -
További szerzők:File Máté (2000-) (mérnök) Nyikes Zoltán Kovács Tünde Anna Tóth László
Internet cím:DOI
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5.

001-es BibID:BIBFORM113859
035-os BibID:(cikkazonosító)8897 (WoS)001045394800001 (Scopus)85167882920
Első szerző:Szántó Attila (gépészmérnök)
Cím:Optimizing Parameters for an Electrical Car Employing Vehicle Dynamics Simulation Program / Attila Szántó, Sándor Hajdu, Gusztáv Áron Sziki
Dátum:2023
ISSN:2076-3417
Megjegyzések:At the Faculty of Engineering of the University of Debrecen we have dealt with the design and construction of electric prototype race cars for more than a decade. With a focus on more conscious design and racing we developed a vehicle dynamics simulation program, which can be used to generate the dynamics functions of the cars from their technical characteristics and data. In this publication, we deal with the optimization of the technical parameters of the above-mentioned cars for various competition tasks using our simulation program. This is a completely new field of application of the used optimization methods. This concept and idea can effectively help student teams all over the world to prepare for various domestic and international competitions. One of the applied methods is a graphic procedure, the other one is the widely used ?adaptive simulated annealing" (ASA). After a brief description of the simulation program, the applied optimization methods and developed MATLAB codes for them are described. Finally, to demonstrate the effectiveness of the methods, we optimize the parameters of a prototype race car for different competition tasks and present the obtained results
Tárgyszavak:Műszaki tudományok Gépészeti tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
electric prototype race car
vehicle dynamics simulation
optimization
MATLAB/Simulink
Megjelenés:Applied Sciences-Basel. - 13 : 15 (2023), p. 1-20. -
További szerzők:Hajdu Sándor (1978-) (gépészmérnök) Szíki Gusztáv Áron (1973-) (fizikus)
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6.

001-es BibID:BIBFORM094403
035-os BibID:(cikkazonosító)4542 (Scopus)85106890160 (WOS)000662485800001
Első szerző:Szántó Attila (gépészmérnök)
Cím:Dynamic Test Measurements and Simulation on a Series Wound DC Motor / Attila Szántó, János Kiss, Tamás Mankovits, Gusztáv Áron Szíki
Dátum:2021
ISSN:2076-3417
Megjegyzések:Previously, a dynamic model and a simulation program for series wound DC motors (SWDCM) were developed in MATLAB/Simulink for modelling them in electric vehicles and mechatronic systems. The electromagnetic characteristics of the motor (electric resistances, dynamic inductances), which serve as input parameters of the program, were also measured. Additionally, locked rotor response measurements were performed to test the accuracy of the measured electromagnetic characteristics. This paper presents the experimental procedure and the results of dynamics test measurements that were performed on the same motor, including the procedure for the determination of the necessary input dynamic parameters for the simulation. While the motor spins up from rest, the intensity of the electric current and the angular speed of the rotor are measured. Finally, the simulation and dynamic test results are compared to check the proper operation of the simulation program.
Tárgyszavak:Műszaki tudományok Gépészeti tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
series DC motor
dynamic simulation
MATLAB
dynamic test measurement
Megjelenés:Applied Sciences-Basel. - 11 : 10 (2021), p. 1-18. -
További szerzők:Kiss János Mankovits Tamás (1981-) (gépészmérnök) Szíki Gusztáv Áron (1973-) (fizikus)
Pályázati támogatás:TKP2020- NKA-04
Egyéb
ÚNKP-20-3
Egyéb
Internet cím:DOI
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7.

001-es BibID:BIBFORM103983
035-os BibID:(Scopus)85139979883 (WoS)000866613100001
Első szerző:Szíki Gusztáv Áron (fizikus)
Cím:Measurement System for the Experimental Study and Testing of Electric Motors at the Faculty of Engineering, University of Debrecen / Gusztáv Áron Sziki, Attila Szántó, János Kiss, György Juhász, Éva Ádámkó
Dátum:2022
ISSN:2076-3417
Megjegyzések:The Faculty of Engineering of the University of Debrecen has a long-standing tradition of developing electric and pneumatic-driven prototype race cars. These vehicles are regular participants in domestic and international university competitions. For more conscious development, thus, for more successful racing, a vehicle dynamics simulation program was developed by our research group. One of the main parts of the above program is the simulation of the drive system, including the electric motor. The input data for the motor simulation programs are the electromagnetic and dynamic characteristics of the motor. Most of these characteristics are usually not specified in the motor catalogue; thus, they have to be measured. In this paper, a detailed description of a recently developed measurement system (MS), which is capable of measuring all the above-mentioned characteristics, is presented. Additionally, by applying it, test measurements can also be performed on the motors to check the accuracy of the output functions generated by the simulation programs. Several experimental arrangements and procedures for specific experimental tasks are also presented here as examples for the application of the MS.
Tárgyszavak:Műszaki tudományok Gépészeti tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
electric motor
electromagnetic and dynamics characteristics
measurement system
dynamic modelling and simulation
Megjelenés:Applied Sciences-Basel. - 12 : 19 (2022), p. 1-18. -
További szerzők:Szántó Attila (1993-) (gépészmérnök) Kiss János Juhász György (1958-) (gépészmérnök) Csernusné Ádámkó Éva (1981-) (matematika-informatika szakos tanár)
Pályázati támogatás:TKP2020-NKA-04
Egyéb
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DOI
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