航空花键接触刚度仿真与试验

The high magnitude of the contact stiffness of aviation splines leads to the difficulty in direct measurement and notable test error. A spline structure model was established through reasonable simplification and scale design according to the actual spline connection structure of an aero-engine. Simulations were made to determine the spline contact stiffness and its variation with transmission torque and lateral force. A test bench consistent with the simulation model was built to test the contact stiffness. The results showed that when the transverse force was constant， the contact stiffness of the spline increased nonlinearly with the increase of transmission torque， and was inclined to be unchanged gradually. When the spline was under the same torque and lateral force，the contact stiffness of the spline was different during loading and unloading，and the hysteresis phenomenon occurred. The average contact stiffness of splines measured under all torques was 20.48 MN/m. The test and simulation results were in good agreement，with an average error of 8.54%. This study provides a reference for studying the contact stiffness of aviation splines.