Mechanism Analysis of Attenuation of Pressure Pulsation in Aviation Filters
The emergency energy release system is an emergency power unit used for retracting and extending aircraft landing gear in case of hydraulic system failure.However,this system has problems such as large pressure pulsations and system instability,which seriously affect the operational safety of the aircraft.A pressure pulsation attenuator is developed using the internal cavity of an aviation filter to suppress the pressure pulsations.Finite element simulation is conducted using pressure wave acoustic propagation theory.The key parameters affecting the transmission loss of the filter are determined to be the cavity diameter,length,inlet diameter,and outlet diameter.Experimental testing shows that the pressure pulsation amplitude behind the filter is reduced from 20.9±0.44 MPa to 20.9±0.15 MPa.The attenuation effect is good.After increasing the diameter of the cavity,the pulsation suppression effect is further enhanced,which is consistent with the simulation results.Verified the correctness of the modeling and simulation method for filter pressure pulsation.This study also provides a new approach for the design of filters in small flow hydraulic systems.
filterpressure pulsationfinite element methodComsolpulsation suppression
万方数据
维普
