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Automotive Engineering ›› 2023, Vol. 45 ›› Issue (6): 1090-1098.doi: 10.19562/j.chinasae.qcgc.2023.06.019

Special Issue: 底盘&动力学&整车性能专题2023年

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Reliability Analysis Method Based on Multidimensional Sub-Parallelepiped Model and Its Application

Lü Hui1,2,Shunjiang Zhong1,Zhencong Li1,Yisha Cao2,Wenbin Shangguan1,Kegang Zhao1()   

  1. 1.School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou  510641
    2.CRAT Test & Certification Company Ltd. ,Guangzhou  510530
  • Received:2022-11-24 Revised:2023-01-04 Online:2023-06-25 Published:2023-06-16
  • Contact: Kegang Zhao E-mail:kgzhao@scut.edu.cn

Abstract:

For the problems that the large uncertainty and correlation coexist in the uncertain parameters of the automotive structural system, the reliability analysis method based on multidimensional sub-parallelepiped model and its application are investigated in this study. Firstly, a multidimensional sub-parallelepiped model is proposed by dividing the boundary intervals of multidimensional parallelepiped model, which is used to describe the system parameters with large uncertainty. Then, a non-probabilistic uncertainty analysis method is proposed by combining the first-order perturbation method with the multidimensional sub-parallelepiped model, which is suitable for handling the system parameters with large uncertainty and correlation. Next, the reliability analysis model of the system is established based on the uncertainty analysis method and the reliability analysis study is carried out. Finally, the automotive acoustic-structure coupling system, the disc brake system, and the powertrain mounting system of an electric vehicle are taken as the research objects to carry out numerical analysis. The uncertainty and reliability of the system response are analyzed, and the effectiveness of the proposed method is verified. The analysis results show that the proposed method can effectively deal with the problems with uncertain parameters involving large uncertainty and correlation, and the proposed method has high calculation accuracy and efficiency.

Key words: multidimensional sub-parallelepiped model, large uncertainty level, uncertainty analysis, reliability analysis