Multistate Reliability Model and Quality Loss Analysis

小行星9500126 本研究整合动态多状态可靠性模型与品质损失分析，以描述产品性能退化随时间的变化。 在这种建模方法中，产品性能水平表示为在任何给定时间的产品设计参数和环境因素的函数。 将定义一个质量损失函数，用于衡量一段时间内的产品性能水平。 该模型和损失函数，然后导致可靠性驱动的产品参数设计，产品性能评估，可靠性驱动的产品公差设计，可靠性和鲁棒性设计集成。 该研究部分建立在与福特汽车公司合作的基于可靠性的机动车系统蒸发排放的工作上，使用蒸发排放作为典型的性能退化问题。 与福特汽车公司的合作使这项研究的结果得到验证，结合理论研究与实际的可靠性为基础的研究，汽车燃料系统的蒸发排放量为1995年和随后的车型年。 这项研究将有助于机动车制造商的能力，以满足新的标准，蒸发排放的清洁空气法和美国环保署和加州空气资源委员会。 它还将开发可靠性驱动的产品设计技术，并建议更广泛使用的强大的设计集成策略。

9500126 Yang This research integrates dynamic multistate reliability model and quality loss analysis in order to describe the product performance degradation as a function of time. In this modeling approach the product performance level is expressed as the function of product design parameters and environmental factors at any given time. A quality loss function which measures the product performance level over a time period will be defined. The model and loss function then lead to reliability-driven product parameter design, product performance evaluation, reliability-driven product tolerance design, and reliability and robust design integration. The research is partially built upon work in collaboration with the Ford Motor Company on reliability-base motor vehicle system evaporative emission, using evaporative emission as a typical performance degradation problem. Collaboration with Ford Motor Company allows the results of this research to be validated by combining the theoretical research with a practical reliability-based study of a motor vehicle fuel system's evaporative emission for 1995 and subsequent model years. This research will contribute to motor vehicle manufacturers' ability to meet new standards for evaporative emission governed by the Clean Air Act and set by the EPA and the California Air Resource Board. It will also develop techniques for reliability-driven product design and suggest robust design integration strategies that can be used more generally.