Global sensitivity analysis of textured surface friction coefficient for rotary vane actuator rotating seal

Abstract A friction coefficient calculation model was developed based on the contact mechanics of rough surfaces to investigate the effect of surface texturing technology on the friction performance of a rotary sealing interface in a rotary vane actuator under start-up conditions. Furthermore, the Extended Fourier Amplitude Sensitivity Test method was employed to systematically analyze the influence of texture parameters on the friction coefficient. Results indicated that texture area ratio was the dominant factor affecting the friction coefficient, followed by the root mean square roughness. The influence of texture depth on the friction performance was relatively small within a given range. The four typical texture shapes analyzed had no significant effect on sensitivity ranking. Additionally, non-negligible interaction effects existed among the parameters, accounting for approximately 30%–40% of the total sensitivity. This study provides a theoretical basis and valuable reference for further optimization of the texture parameters in the rotary sealing of rotary vane actuators.