Research on Accelerated Degradation Test and Reliability Evaluation Method for Hydraulic Pumps Based on Parallel Energy Saving

Hydraulic pump is a product with high reliability and long-life, there exist many urgent problems like long test period, high cost and a larger power consumption in the reliability evaluation method of pump. A new kind of reliability test bench is built combined with parallel power-saving design concept, which based on principles of energy saving and power recycle. Multi-pumps reliability accelerated degradation test is achieved by applying step stress on the pump under test. Volumetric efficiency is selected as performance degradation evaluating index, the degradation of whose is much closed to real physics model. The accretion model for hydraulic pump reliability test is built based on inverse moment estimation method, by which hydraulic pump reliability level under different stress conditions is given. In the meantime, the method of concurrent accelerated degradation testing can serve as references of other core hydraulic components.