Considering product degradation on quality characteristics over time, the multivariate quality loss function is used to model quality loss due to product degradation as a continuous cash flow function under continuous compounding. As a result, the functional relationship between the present worth of expected loss of product with correlated characteristics and its related tolerances is derived. The present worth of quality loss and product degradation over time is integrated into the total cost model, and a new optimization model for the tolerance design of products with correlated characteristics is presented. The optimal tolerance design is achieved by minimizing the total cost, which is the sum of manufacturing cost and the present worth of expected quality loss. An example of the leaf spring involving optimal tolerance design is given to demonstrate the effectiveness of the proposed model.
|Number of pages||4|
|Journal||Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition)|
|Publication status||Published - 2009|