Research on energy saving in accelerated life testing for airborne hydraulic pump

Accelerated life testing (ALT) for the airborne hydraulic pump is a good way to obtain the reliability of airborne hydraulic pump under a more severe environment in a short period of test time. For fully thinking of energy saving, a new kind of technique taking hydraulic motor to recover energy that exists in traditional load subsystem is adopted. The possibility and performance of the ALT system, consisting of a DC motor, a variable-displacement pump and a variable-displacement motor, has been analysed. The model of the system has been made by bondgraph simulation technique and the hydrostatic power-distribution transmission has been studied. On the one hand, the new technique can reduce the loss of energy and avoid high temperature of hydraulic oil, but on the other hand, it can add to the difficulties of strong robust control. A series of simulations are performed, and the results show that the new technique for energy saving is satisfactory and the robust character of the system should be further studied.