The structural reliability of the aviation hydraulic rotary joint was studied. The failure behavior of the aviation hydraulic rotary joint was analyzed by the finite element method, and the failure mode of the rotary joint was analyzed. The finite element calculation results were verified by comparison with experimental results. The structural reliability calculation method of aviation hydraulic rotary joint was established. The Kriging model, support vector machine, and extreme learning machine model were used to predict the stress of rotary joint seals, and the influence of different parameters on the reliability of aviation hydraulic rotary joints was investigated. The research results show that Stress failure is the structural failure mode of the sealing assembly of aviation hydraulic rotary joint. The structural reliability of aviation hydraulic rotary joints increases with the increase of material strength and temperature, and decreases with the increase of working pressure and fit clearance, but there is no monotonic relationship between it and the lap size.
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