Experimental studies and Challenges on Impulse Pressure Testing: Assessing Performance of Hydraulics System

Abstract

The impulse pressure test system is a quite complex non-linear system; its control procedures are distinct from the conventional linear systems. The impulse testing is very essential in order to assure the reliability of hydraulic systems especially in aerospace components. The experiment setup is controlled by PID controller. Through feedback of various control parameters, the inner closed loop damping ratio is modified. In addition, the various damping ratios are achieved by varying the gain of pressure difference feedback. The major challenges are pressure cycling with 150 % of working pressure at required frequency with the desired rate of pressure rise. The proposed pressure impulse testing is conducted on hydraulic elements at pressure ranges up to 420 bars. The test results conclude that, the developed impulse rig is capable to test hydraulic elements with as well as without intensifier for a low frequency range 0.25 Hz to 5 Hz through tuning of PID controller parameters.