Test technology research and fatigue damage prediction of a car body based on dynamic simulation load spectrum
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Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering) ISSN 1673-565X (Print); ISSN 1862-1775 (Online) www.jzus.zju.edu.cn; www.springerlink.com E-mail: [email protected]
Test technology research and fatigue damage prediction of a car body based on dynamic simulation load spectrum* Lu JIA, Huan-yun DAI, Ye SONG†‡ State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China †
E-mail: [email protected]
Received Dec. 25, 2019; Revision accepted Apr. 10, 2020; Crosschecked Oct. 16, 2020
Abstract: The dynamic model of a high-speed electric multiple unit (EMU) is established based on the theory of rigid-flexible coupling multi-body system dynamics. Depending on the actual operating conditions of the vehicle, there are a variety of conditions of car body load-time history. We assess ineffective amplitude omission, load spectrum extrapolation, and extreme determination through the car body load-time history, and then obtain the car body fatigue load block spectrum. Finally, we perform a fatigue strength test on the whole car body on a car body fatigue test bench. It is shown that the accelerations of the three directions of the vehicle car body increase with increasing speed. When the train passes a curve, the lateral acceleration average becomes greater. There is also an increase in the car body accelerations in three directions when the train goes through a turnout or twisted line. Under the condition of a failed spring, the vertical acceleration of the car body is obviously increased. Anti-yaw damper failure will cause a significant increase in vehicle lateral acceleration. The failure of lateral and vertical dampers on the second suspension causes an insignificant acceleration increase in three directions. The car body acceleration increases the wear-type profile relative to the original profile in various working and speed level conditions a little. The influence on the damage of vehicle car body under various working conditions is predicted according to the obtained load spectrum. Key words: Dynamic model; Car body; Load-time history; Fatigue; Damage https://doi.org/10.1631/jzus.A1900662 CLC number: U270.1
1 Introduction The car body is subjected to complex alternating loads during normal operation, and its failure form is a typical fatigue failure. In recent years, with the increase of train running speeds, the load on the car body has become increasingly complicated, the use conditions have become more severe, and the probability of fatigue damage is increasing (Gou et al., 2015; Yang et al., 2017). Domestic and foreign scholars have carried out many studies on the fatigue ‡
Corresponding author Project supported by the Science and Technology Innovation Program of Central Universities (No. 2682019CX45), China ORCID: Lu JIA, https://orcid.org/0000-0001-5339-7433 © Zhejiang University and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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strength of the car body, which are summarized as follows. Gutiérrez-Carvajal et al. (2018) carried out experimen
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