概念设计产品的模糊可靠性预测及方案评价

对概念设计产品进行了模糊可靠性预测,将故障树底事件发生可能性的模糊语言描述量化为模糊集的元素。在可靠性预测过程中针对基于模糊集理论的变参数逐点运算模型的不足,利用参数型Hamacher算子建立了定参数逐点运算模型并在此基础上依据设计者的主观判断确定预测结果,提高了分析效率并得到了更合理的结果。利用物理规划进行概念设计方案评价,为概念设计方案评价提供了新的途径。最后用实例说明了上述方法的可行性及合理性。     

Hybrid optimization model of product concepts

Deficiencies of applying the simple genetic algorithm to generate concepts were specified. Based on analyzing conceptual design and the morphological matrix of an excavator, the hybrid optimization model of generating its concepts was proposed, viz. an improved adaptive genetic algorithm was applied to explore the excavator concepts in the searching space of conceptual design, and a neural network was used to evaluate the fitness of the population. The optimization of generating concepts was finished through the ＂evolution - evaluation＂ iteration. The results show that by using the hybrid optimization model, not only the fitness evaluation and constraint conditions are well processed, but also the search precision and convergence speed of the optimization process are greatly improved. An example is presented to demonstrate the advantages of the orooosed method and associated algorithms.