Active Control on Fluid Borne Pulsation Using Piezoelectric Valve as Absorber

With the development of the aircraft hydraulic power supply system towards high pressure and large load, the fluid borne pulsation has become increasingly a vital problem demanding an urgent solution. Passive pulsation dampers have been used traditionally to reduce the fluid borne pressure pulsations of high frequencies, but the application of such passive devices are limited in low frequency conditions because of their bulk volumes and poor performances. This paper presented a vibration active control method using piezoelectric direct drive servovalve to reduce the vibration of fluid power supply and pipeline systems. The theory of vibration active control based on the piezoelectric direct drive servo was illustrated in detail. Models of the piezoelectric direct drive servovalve, aero-pump and fluid-structure coupling vibration were established. The auto optimum control method was adopted, which can adjust control parameters at any time against the disturbance. A simulation platform was designed and built to validate the vibration attenuation efficiency. The simulation results show that the vibration active control method is adaptive and robust against disturbance, and can keep the vibration minimum under variable speed and load