Product life evaluation method and device based on generalized nonlinear Wiener degradation process

The invention provides a product life evaluation method and device based on a generalized nonlinear Wiener degradation process, and relates to the technical field of reliability analysis, and the method comprises the steps: obtaining the performance degradation characteristic data of a target product under constant acceleration stress; and determining life distribution of the target product according to the performance degradation characteristic data and a pre-established life evaluation model. Wherein the life evaluation model adopts a generalized nonlinear Wiener degradation process model, and on the basis of a threshold conversion thought, the condition that generalized nonlinear Wiener degradation reaches a fixed threshold is equivalent to the condition that standard Brownian motion reaches a nonlinear time-varying threshold; a local tangent is adopted to replace a non-linear boundary, and a first-arrival life distribution approximate solution of a generalized non-linear Wiener degradation process model i