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Title Parameter identification of nonlinear bearing stiffness for turbopump units of liquid rocket engines considering initial gaps and axial preloading
Authors Verbovyi, Anton Yevhenovych  
Вербовый, Антон Евгеньевич
Khomenko, Vladyslav Volodymyrovych
Neamtu, C.
Pavlenko, V.
Cherednyk, M.
Vashyst, Bohdan Viktorovych
Pavlenko, Ivan Volodymyrovych  
Keywords bearing support
axial force
radial gap
regression analysis
artificial neural networks
Type Article
Date of Issue 2021
URI https://essuir.sumdu.edu.ua/handle/123456789/86320
Publisher Sumy State University
License Creative Commons Attribution - NonCommercial 4.0 International
Citation Verbovyi A., Khomenko V., Neamtu C., Pavlenko V., Cherednyk M., Vashyst B., Pavlenko I. (2021). Parameter identification of nonlinear bearing stiffness for turbopump units of liquid rocket engines considering initial gaps and axial preloading. Journal of Engineering Sciences, Vol. 8(2), pp. D8-D11, doi: 10.21272/jes.2021.8(2).d2
Abstract This article is devoted to developing a mathematical model of nonlinear bearing supports for turbopump units of liquid rocket engines considering initial gaps and axial preloading. In addition to the radial stiffness of the bearing support, this model also considers the stiffness of the bearing cage, the rotational speed of the rotor, axial preloading of the rotor (due to which the inner cage shifts relative to the outer, changing the radial stiffness of the support), as well as radial gaps between contact elements of the bearings. This model makesit possible to calculate the stiffness of the bearing supports more accurately. The proposed model is realized using both the linear regression procedure and artificial neural networks. The model’s reliability is substantiated by the relatively small discrepancy of the obtained evaluation results with the experimental data. As a result, this model will allow determining the critical frequencies of the rotor with greater accuracy. The results have been implemented within the experience of designing turbopump units for State Company “Yuzhnoye Design Office”.
Appears in Collections: Journal of Engineering Sciences / Журнал інженерних наук

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