Tolerance design based on variation transfer function

摘要

Tolerance design presented in this paper minimizes the expected quality loss due to system performance variations from the target value and the cost for controlling the tolerances of components and subsystems. The method is based on loss function, variation transfer function (VTF) and design of experiments methodology. The VTF developed in this paper makes it possible to access the variance of system performances for any tolerance levels setting of the components or subsystems based on the data from only one tolerance levels setting with on more experiments or simulations to be conducted. The VTF transfers the variations in the parameters of the components or the subsystems to the variations in the quality characteristic of the system. An optimization model is presented for tolerance design and a method is given to find the coefficients for the VTF. An example is given to demonstrate the method.