Discrete Reliability Analysis Method for Multistage Centrifugal Pump Transmission Structure Based on Sparse Grid Model

In the design process of multistage centrifugal pump transmission structure, the design parameters and actual process often have uncertain differences, which will lead to the instability of product quality. In order to effectively improve the reliability of centrifugal pump operation under extreme working conditions and minimize the failure rate of equipment operation, the discrete reliability analysis method combining sparse grid model and 6σ theory is proposed for multistage transmission structure design. Firstly, the method of separating parts is used to analyze the mechanics of each component of the multistage centrifugal pump transmission structure, and the global limit state function of the system is constructed. Then, the sample data is constructed by using sparse grid initialization method, and the approximate model is built. Finally, the reliability analysis of the fitting model is carried out by using 6σ theory. The research results show that compared with the traditional integral reliability analysis method, the discrete analysis method reduces the calculation time by 31.25% and has higher solution accuracy; compared with other approximate models, the sparse grid model has better robustness. Therefore, the discrete reliability analysis method based on sparse grid model proposed in this paper has guiding significance for the design of centrifugal pump transmission structure.