Vibration active control of fluid pulsation based piezoelectric valve

With the development of the aircraft hydraulic power supply system towards high pressure and large load, Fluid-borne vibration in piping systems leads to serious problems. Because of pump's periodic flow pulsation and fluid-structure interaction, mechanical fatigue can readily take place. Traditionally, passive pulsation dampers have been used to reduce fluid pulsation of high frequencies, but the application of such passive devices is limited in low frequency conditions because of their bulk volumes or poor performances. This paper presented a distributed active control method using piezoelectric direct drive servovalve to reduce the fluid pulsation in pipeline systems. The idea of distributed vibration active control based on the piezoelectric direct drive servo was described in detail. Models of the piezoelectric direct drive servovalve, aero-pump and fluid-structure coupling vibration were established. The control method can adjust control parameters adaptively against the disturbance. A test platform was designed and built to validate the vibration attenuation efficiency. The experimental results show that the vibration active control method is adaptive and robust aganist disturbance, and can keep the vibration minmum under variable speed and load.