Abstract: Conducting research on the fracture problem of parking air conditioning pipes, taking the pipes system as the research object, building a finite element simulation model, conducting modal analysis and unit frequency response analysis, loading the enterprise standard random vibration PSD power spectral density, conducting random vibration simulation analysis, and obtaining fatigue damage results of the piping system. The simulated fatigue fracture position of the original pipes is consistent with the random vibration test, verifying the accuracy of the simulation model. By changing the length of the rubber pipes on the suction pipe, the optimized fatigue life of the pipes was significantly improved, and the pipes did not break after random vibration testing. Provides guidance for fatigue analysis and optimization design of air conditioning pipes, shortens the project development cycle, and reduces design costs.

Key words: Parking air-conditioning pipes, Random vibration, Power spectral density, Fatigue damage