Study On Pressure Shock And Internal Leakage Of Continuous Rotary Electro-hydraulic Servo Motor

Flight simulation turntable is mainly used for semi physical simulation of drones,fighters and other aircrafts.Its performance directly affects the accuracy and reliability of simulation results.In order to develop the aircraft with higher precision and better performance,the requirements for the development of simulation turntable are gradually increasing.The continuous rotary electro-hydraulic servo motor directly affects the overall performance of the turntable as the driving mechanism of the simulation turntable,while the pressure impact and internal leakage of the motor affect the low-speed performance of the motor.Therefore,it is of great significance to study the pressure impact and internal leakage of the continuous rotary electro-hydraulic servo motor for improvement of motor performance.Firstly,aimming at the phenomenon that the high-pressure cavity and the low-pressure cavity of the continuous rotary electro-hydraulic servo motor constantly switch to produce pressure shock,the pressure gradient mathematical models under the pre-compression cavity and the U-shaped groove structure are established respectively.The pressure variation and the pressure gradient curves under the pre-compression cavity structure and the U-shaped groove are obtained respectively by using MATLAB,so as to optimize the structure of the pre-compression cavity and the U-shaped groove.The optimal structure size of the pre-compression cavity and U-groove is obtained,which provides the research basis for the subsequent flow field simulation of the motor in the decompression process.Secondly,the flow field simulation models of different buffer structures are established.RNG k-? turbulence model is selected according to the actual working condition of the continuous rotary electro-hydraulic servo motor.The simulation analysis of the pressure change of the seal cavity in the process of reducing pressure of the continuous rotary electro-hydraulic servo motor is carried out by FLUENT software.The pressure change curve and pressure gradient change curve under different buffer structures are obtained,and the influence of different buffer structures on the pressure impact of the motor is analyzed comparatively.Thirdly,in order to study the influence of inlet and outlet pressure difference and triangular buffer groove on the internal leakage of motor,the flow field model of motor with or without triangular groove is established respectively.The mesh model is divided by ICEM-CFD.The pressure distribution of the internal flow field of the motor under different pressure difference is analyzed by FLUENT software.Then,the gap leakage under different pressure difference is calculated by CFD-POST software,and the leakage curve is obtained.Finally,the continuous rotating electro-hydraulic servo motor test-bed is built to carry out the internal leakage test,and the internal leakage curve of the motor is obtained and compared with the simulation results.The influence of the pressure difference between the inlet and outlet of the motor on the internal leakage is studied,which lays the foundation for motor control and structure improvement.