témavezető: Kerényi György
helyszín (magyar oldal): Gép- és Terméktervezés Tanszék helyszín rövidítés: GT3
A kutatási téma leírása:
a.) Preliminaries:
By the using of complex structures there are many effects that using laboratory or simulation methods cannot be or only partially modeled. In most cases the complex load on the structure and the response of the structure are not known either, thus the designed structure experienced lifetimes show a large deviation respect to the expectations. In both, industry and science life more people are involved with the lifetime research, and in this regards, to this direction researches have been conducted in the agricultural industry as well. Compared to other industries the conditions of usage are more complex therefore show a large deviation of user profile. Several simulation models and laboratory tools have been already developed for modelling the field effects, but the accuracy might need further improvement. In Hungary departments of machine design of have been dealing with such research and the CLAAS Hungária Kft. has joined this process in the last decade. As a result of these researches several test benches, circular track with obstacles and the necessary measurement methods were realized. The results are mainly reflected in in-house validation reports but several PHD dissertations have been submitted in scientific fields, one of these dealt with the effect between the road profile and the complex structures’ response of agricultural structure.
b.) Aim of research:
By the assessment of the complex load history the load combination and the most critical load cases can be defined. With the help of measurements, induced load groups can be crated on statistical base, which represents the real loads under laboratory and virtual condition. By this we get a faster validation procedure compared to the real conditions, whereas the load collective contains the effect that are mostly influence the lifetime. These load groups that we can construct in testing can be effectively applied in simulation and laboratory tests, as well. To increase the reliability of the design not only the static loads, but the dynamic parameters can be also used during the sizing that are required for the lifetime calculation. During the preparation of the dissertation a new model will be developed between the environmental loads and the test loads, that can be generally applied to the testing of agricultural harvesting attachments. As a result, a significant cost can be spared in practical terms, during the optimalization of the structure. Because the sizing is done with more reliable design data, the efficiency of the structural element can be increased.
c.) Tasks, main items, necessary time:
˗ Review of the literature and processing the information obtained by the company. Selection of the examinated header and studying the exact operation. (6 months)
˗ Preparation of the measurement plan to a complex structure, which can be used to measure the required parameters. Choosing the right location and assess their capability. (6 months)
˗ Development of tools for laboratory test, optimize them and finishing the measuring guidelines, methodology. (12 months)
˗ Evaluation of measurement results, determination of the relationship between complex load cases and structural effects. Then determine the parameters that are necessary for laboratory and simulations reconstruction of operating conditions. (12 months)
˗ Comparison of the field and laboratory measurements both quantitative and qualitative aspects, and additional iteration of the parameters. (6 months)
˗ Complete the dissertation and clarification of the thesis. (6 months)
d.) Required equipment:
The tools, and conditions that are necessary to the simulations and field operation measurements are provided by the BME GT3 department and CLAAS Hungária Kft.
e.) Expected scientific results:
Development of a relationship model between complex loads and the response of complex structure, that can be used in practice. Determination of the influencing factors in the case of complex structures’ lifetime, through which more accurate sizing can be accomplished that involves determining the necessary parameters of weight reduction.
f.) References:
Gedeon, J. (1981): Mechanika IV/1 Lengéstan. Budapest Műszaki Egyetem Közlekedésmérnöki Kar, Tankönyvkiadó
Kézdi Á. (1952): Talajmechanika I.-II. Budapest: Tankönyvkiadó
Kiss P. (2001): Terepen mozgó járművek energetikájának egyes kérdései. PhD doktori értekezés, Gödöllő: Szent István Egyetem Műszaki Tudományi Doktori Iskola
Laib L. (2002): Terepen mozgó járművek. Budapest: Szaktudás Kiadó Ház
Márialigeti, J. (1994): Géptervezés I.. Budapesti Műszaki és Gazdaságtudományi Egyetem, Budapest, Terhelésanalízis fejezet
Márialigeti, J. (2008): Valószínűségszámítási alapfogalmak. Budapesti Műszaki és Gazdaságtudományi Egyetem
Gurmai, L. – Kiss, P. (2014): The Towed Vehicle as an Oscillating System. International Journal of Heavy Vehicle Systems Vol. 21, No. 3, 2014, pp. 262-280. ISSN: 1744-232X
Kerényi, Gy. Farkas, Zs. (2004) Dynamic load model to develop ploughs. Book of Abstracts of International Conference on Agricultural Engineering, Leuven: pp 52-53 ISBN: 9076019258
előírt nyelvtudás: ENGLISH felvehető hallgatók száma: 1
Jelentkezési határidő: 2021-10-08
2024. IV. 17. ODT ülés Az ODT következő ülésére 2024. június 14-én, pénteken 10.00 órakor kerül sor a Semmelweis Egyetem Szenátusi termében (Bp. Üllői út 26. I. emelet).
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