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考虑产品质量特征随着时间退化的影响,用多变量质量损失函数在连续复利条件下,把产品特征的退化作为一个连续的现金流量函数建模,从而建立了相关特征产品的期望质量损失现值与其公差的函数关系;在此基础上把质量损失的现值和产品随时间退化的影响集成到总成本模型中,提出了相关特征产品公差设计新的优化模型.产品的优化公差通过使总成本(制造成本与期望质量损失现值之和)最小化而获得,一个板簧公差设计的实例验证了该模型的有效性.
Taking into account the influence of product quality characteristics over time degradation, using the multivariate mass loss function to model product degradation as a continuous cash flow function under continuous compounding conditions, the present value of the expected mass loss of the associated characteristic product is established On the basis of which the present value of the mass loss and the influence of the product degradation with time are integrated into the total cost model and a new optimization model of the related feature product tolerance design is proposed.The optimization tolerance of the product is achieved by making the total cost (The sum of the manufacturing cost and the present value of expected mass loss), an example of a leaf spring tolerance design validates the effectiveness of the model.