考虑产品质量特性受随机冲击的影响发生变异,随机冲击的发生次数服从强度为λ的泊松过程。一旦发生变异,过程均值和方差同时随时间线性漂移。在综合多变量质量损失和容差成本的基础上,提出过程均值、容差及使用寿命优化设计的经济模型。数值计算表明所提模型是有效的。灵敏度分析讨论了模型参数对决策变量的影响。 The variation of product quality characteristics under random impact is considered, and the number of random impacts follows the Poisson process with intensity λ. Once the variation occurs, the mean and variance of the process both drift linearly with time. On the basis of synthesizing multivariate quality loss and tolerance cost, an economic model of process optimization, tolerance and service life optimization design is proposed. Numerical calculation shows that the proposed model is effective. Sensitivity analysis discusses the effect of model parameters on decision variables.