Int J Performability Eng ›› 2023, Vol. 19 ›› Issue (10): 687-699.doi: 10.23940/ijpe.23.10.p6.687699

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An Interval-Probability Hybrid Structural Reliability Calculation Method Based on CSSA-BR-BP

Yonghua Lia,*, Shujian Liua, Xiaoning Baib, and Yufeng Wanga   

  1. aCollege of Locomotive and Rolling Stock Engineering, Dalian Jiaotong University, Dalian, Liaoning, China;
    bSchool of Mechanical Engineering, Dalian Jiaotong University, Dalian, Liaoning, China
  • Contact: * E-mail address: yonghuali@163.com
  • About author:Yonghua Li is a professor in the College of Locomotive and Rolling Stock Engineering at Dalian Jiaotong University. Her research interests include fatigue reliability analysis of vehicle structures, digital simulation and optimization design of mechanical products, and RAMS engineering.
    Shujian Liu is a master's student in the College of Locomotive and Rolling Stock Engineering at Dalian Jiaotong University. His research interests include reliability analysis of vehicle structures.
    Xiaoning Bai is a Ph.D. in the School of Mechanical Engineering at Dalian Jiaotong University. His research interests include CAE key technologies, fatigue reliability analysis of vehicle structures, uncertainty analysis, and optimization.
    Yufeng Wang is a master's student in the College of Locomotive and Rolling Stock Engineering at Dalian Jiaotong University. His research interests include reliability analysis of vehicle structures.

Abstract: For the problem of reliability analysis of hybrid structures containing interval variables and probabilistic variables, a hybrid structure reliability calculation method based on chaotic sparrow search algorithm (CSSA) and Bayesian regularized (BR) optimization algorithm optimized BP neural network is proposed. First, a reliability analysis model is constructed based on the mixed uncertainty variables, evidence theory is introduced to characterize the uncertainty of the interval variables, and the interval variables are transformed into probabilistic variables by using uniform probability processing method, which in turn decouples the two-layer nested reliability solving problem into a single-layer reliability solving problem. Next, the weights and thresholds of the BP neural network are optimized using CSSA and BR techniques, leading to the development of the CSSA-BR-BP neural network surrogate model. Finally, the HL-RF method in Advanced First Order Second Moment (AFOSM) is employed to efficiently compute the structural reliability index. The results demonstrate that the proposed method exhibits excellent fitting accuracy and enhances the efficiency of reliability analysis for hybrid structures, confirming the feasibility of the approach.

Key words: mixed uncertainty, chaotic sparrow search algorithm, BP neural network, structural reliability analysis