Abstract
An accelerated degradation test (ADT) has become a popular method to accelerate degradation mechanisms by stressing products beyond their normal use conditions. The components of an automobile are degraded over time or cycle due to their constant exposure to friction or wear. Sometimes, the performance degradation can be measured only by destructive inspection such as operating torques of return-springs in a bi-functional DC motor system. Plastic deformation of the return-spring causes the degradation of actuating forces for shield movement, resulting in deterioration of the shield moving speed in a headlight system. We suggest a step-by-step procedure for a reliability analysis for a bi-functional DC motor in a headlight system, based mainly on accelerated destructive degradation test (ADDT) data. We also propose nonlinear degradation models to describe the ADDT data of the return-springs. Exposure effects of high temperatures on the return-springs are quantitatively modeled through the ADDT models. We compare the estimation results from both the closed-form expression and Monte Carlo simulation to predict the failure–time distribution at normal use conditions, showing that the lifetime estimation results from the closed-form formulation are more conservative.
Highlights
Due to increasing global competition, automobile manufacturers are requested to evaluate the reliability of newly designed automobiles as quickly as possible using limited resources before releasing them
We propose nonlinear degradation models to describe the accelerated destructive degradation test (ADDT) data of the return-springs in a bi-functional DC motor system
The ADDT is a useful tool for making reliability inferences and predictions of products with limited testing times and resources by employing accelerated stress conditions
Summary
Due to increasing global competition, automobile manufacturers are requested to evaluate the reliability of newly designed automobiles as quickly as possible using limited resources before releasing them. The degradation level at a specific time-point can be measured only by destructive inspection such as operating torques of return-springs in a bi-functional DC motor system, as in this study. Shin and Lee [7] proposed the reliability analysis of small DC motors for automobiles with Accelerated Life Testing. We propose nonlinear degradation models to describe the ADDT data of the return-springs in a bi-functional DC motor system. The reliability evaluation for DC motor systems using ADDT is not abundant Some components such as the return-spring in automobiles have performance degradation patterns with a destructive nature. We proposed a nonlinear degradation model to describe the ADDT data of the return-springs.
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