Research On Dynamic Characteristics Of The Vane Rotary Actuator

The vane seal of hydraulic rotary vane actuator(hereinafter referred to as the rotary actuator)forms a pressure difference on the vane through high and low pressure oil to push the rotor to rotate and transmit torque to the load.High-performance RVA have quite good application prospects.The main technical difficulty in researching RVA is its sealing,and the performance of RVA is good or bad.Directly affect its dynamic characteristics.The paper takes the RVA as the research object,and mainly carries out the following research work:(1)The contact pressure distribution of the RVA vane seal was obtained by numerical calculation and finite element analysis.The distribution of the oil film was analyzed according to the contact pressure distribution of the sealing surface.The influence of the RVA speed and the sealing pre-compression on the oil film distribution was studied.(2)The vane seal leakage amount and frictional resistance are analyzed.By calculating the film thickness ratio of the sealing surface,the minimum oil film thickness required for the hydrodynamic lubrication of the RVA vane seal is determined,and the starting pressure of the different vane sealing pre-compression amount is obtained,and the RVA is obtained.The transmission efficiency was studied to obtain the pre-compression of the vane seal at the highest total efficiency.(3)The mathematical model of the dynamic characteristics of the RVA is established.The torque term generated by the viscous damping is improved in the torque balance equation of the mathematical model of the RVA dynamics.The RVA is simulated by MATLAB/Simulink,and the angular velocity response curve before and after the improvement of the mathematical model is compared.And the high pressure chamber pressure curve verifies the necessity of mathematical model improvement.The response speed and motion stability of the RVA are analyzed.The main factors affecting the response speed and stability of the RVA are pointed out,and the dynamic characteristics of the RVA is optimized.