Abstract:The winding coupling has a long working life, but it is difficult to quickly assess its reliability. To solve the above problem,the double stress accelerated life test and the statistical analysis of the failure life data of the winding coupling were carried out by the method of constant accelerated life test. In the accelerated life test, through the analysis of the failure mechanism of the winding coupling, the acceleration stress and acceleration model were determined. The condition matrix of the accelerated life test was determined by Escobar-Meeker (E-M) method. In the statistical analysis of failure life data, it was assumed that the life of the winding coupling obeyed Weibull distribution, and the Weibull probability paper test and Bartlett test were combined to test the life distribution of the winding coupling. Maximum likelihood estimation (MLE) and optimal linear unbiased estimation (BLUE) were used to determine the shape parameters and characteristic life of the distribution model, and the parameter estimation methods were analyzed and compared. The statistical analysis of the data of the double stress constant accelerated life test of the winding coupling showed that the life of the winding coupling could be accurately described by the double stress inverse power law-Weibull, and the accelerated stress-life model was obtained. Under the normal speed level of 1 000 r/min and the normal torque level of 0.6 Nm, the reliability index of a type of winding coupling was obtained by the optimal linear unbiased estimation method.