A Product Quality Indez Derived from Product Lifetime Distribution
The reliability requirement of a product (or component) is often given by the mean life. Actually, the expected service life of a product is smaller than the mean life unless the product is run to failure. This implies that an α fractile fife with 0 <α << 0.5 can better represent the product service lifetime than the mean fife. On the other hand, the fife of about 50％ of the products is larger than the mean fife. As such, the (1-α)-fractile lifetime reflects the lifetime of the quality products, and can be viewed as a goal for most of the products to achieve by improvement of the product quality. A product quality index is defined by combining these two lifetime measures. The quality indices associated with several well-known lifetime distributions are derived as functions of some distributional parameter(s). The proposed index represents the life consistence of the products produced in batches and can be used for evaluating and comparing the quality of the products produced by different manufacturers. The usefulness of the quafity index is illustrated by an example.
Fractile lifetime lifetime distribution quality indez product quality
R.Jiang
Faculty of Automotive and Mechanical Engineering,Changsha University of Science and Technology Changsha,Hunan,China
国际会议
长沙
英文
573-577
2009-04-11（万方平台首次上网日期，不代表论文的发表时间）