A Burn-in and Warranty Strategy Minimizing the Manufacturing Cost for a Product under Imperfect Repair

• Main Authors: Ping-Yueh,Hsiao, 蕭秉岳
• Other Authors: Cheng-Hung Hu
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/7r697g

碩士 === 國立成功大學 === 工業與資訊管理學系 === 106 === In this study, an optimization model is developed to investigate the optimal burn-in time, warranty length and age reduction factor of a product from a manufacturer’s perspective, so that the mean of total product servicing cost is minimized. It is assumed that when the product fails, we conduct minimal repair during burn-in time. The products after burn-in are sold to the market, it is difficult for consumers to judge quality. Therefore, the warranty often plays an important role. If the product during warranty fails before bathtub curve first change point, then we conduct minimal repair. If the product fails after bathtub curve first change point, then we conduct imperfect repair. In this study, a virtual age model is used to express the status after imperfect repair. The degree of imperfect repair will generate different age reduction factors, and bring different age reduction factors into the failure rate. Out-of-warranty, if the product fails before its useful life limits, it causes customer dissatisfaction and incurs a penalty cost for the manufacturer. And Monte Carlo simulations were used to simulate the time-to-failures at different age-reducing factor failure rates to calculate the average number of failures after burn-in, warranty, and post-warranty throughout the product life cycle. We provide a numerical example to determine the optimal burn-in time, optimal warranty length, and optimal imperfect repair degree to minimize total cost. A sensitivity analysis is conducted to evaluate the effect of model parameters on the optimal solution.