Research on load spectrum of aero hydraulic pump based on accelerated degradation testing

As the power sources of hydraulic systems in aircrafts, gaining reliability information of aero hydraulic pumps tends to be of great significance. However, aero hydraulic pumps with high reliability and long lifetime pose a great challenge to obtaining failure data through traditional life testing or accelerated life testing (ALT). In this paper, accelerated degradation testing (ADT), which is easily accessible to lifetime of pumps without failure data, is proposed. Based on the service conditions and working principle of pumps, the failure mechanism was analyzed. And the ADT load spectrum was designed to reflect the actual working conditions and to ensure a desirable accelerated factor. In addition, by comparing the result of test under service conditions with that of ADT, the aforementioned testing method is proved to be applicable to aero hydraulic pumps and can be further applied to other electro-mechanical products with similar properties.