Objective Service reliability of the car body suspension beam structure in urban rail transit directly affects the service safety and reliability of the vehicle system. To improve this service reliability, a reliability optimization method for urban rail transit car body suspension beam structures is proposed based on a criterion-correlation analytic hierarchy process (AHP) model.

Method A parametric analysis method is used to analyze the structural performance under operating conditions. According to the analysis results and the quantitative rule of probabilistic correlation, a correlation matrix between the structural design scheme and the top-level design objectives is established. Combined with the traditional AHP evaluation model, the weight matrix of the design criterion layer is constructed, and then a correlation weight matrix is formed using matrix multiplication. On the premise that the correlation weight matrix meets the requirement of consistency ratio, a structural reliability optimization model is established, and the structural reliability optimization design is carried out using an optimization algorithm. In case study of an urban rail transit car body suspension beam structure, the effectiveness of the proposed method is verified.

Result & Conclusion The proposed method can reasonably allocate the correlation weights of each structural design criterion and reduce the failure probability of urban rail transit car body suspension beam structure to 0.0019.