Research of Double Nozzle Flapper Valve Accelerated Degradation Test

This paper selected the double nozzle flapper type electro-hydraulic servo valve as the research object. Through to analys the wear failure mechanism of electro-hydraulic servo valve to determine the test stress and to select the Pressure gain and leakage as the Degradation performance indicators. So it makes the detail Accelerated degradation test project . and it designs a test system for the pollution wear test. Then, by modeling the degradation process as a drift Brown Motion of which the first passage time follow inverse Gaussian distribution, this paper generated the reliability model of the electro-hydraulic servo valve. Finally, the maximum likelihood combined with least square of accelerated degradation testing data is used to estimate the degradation data of leakage from the test.