Analysis and Design of an Impulse Pressure Test System for Aviation Hydraulic Accessories

When solenoid valves are opened or closed in the aviation system, the impact on the pipelines could far exceed the working pressure. In some cases, it could even be several times the working pressure, that is, impulse pressure. Posing a serious threat to pipelines and hydraulic components, it can reduce their reliability significantly [1]. According to the test methods and parameters as specified in the standard GJB3849-99, a pressure impulse test system is developed for the hydraulic accessories of military aviation products. In the system, proportional servo valve is taken as the element of impulse waveform control, which leads to the generation of trapezoidal wave, sine wave and water hammer wave. Also, a supercharger is applied to reach the peak pressure of 42 MPa. Developed by Lab Windows/CVI, the control system is applicable to output the given waveforms through computer closed-loop control. The actual test waveform and standard waveform are guaranteed to be highly consistent to meet different test requirements of specific test pieces. Thus, the test system can be applied in the pressure pulse test on civil or military aviation hydraulic pipelines and accessories.