复杂产品概念设计多学科过程建模方法研究

Research on multi-disciplinary process modeling of conceptual design for complex product

为了使复杂产品概念设计的过程模型支持多学科优化,实现概念设计过程中的求解功能,确定产品设计的综合最优方案,提出了基于扩展Petri网与NSGA-Ⅱ算法相结合的多学科过程建模方法.针对复杂产品设计过程的特点,分析了概念设计在多学科优化过程中的重要作用,研究了扩展Petri网模型建立和NSGA-Ⅱ算法的执行过程,给出了以扩展Petri模型的变迁序列作为NSGA-Ⅱ算法染色体,结合属于Petri网模型元素的选择算子、交叉算子进行NSGA-Ⅱ优化运算的方法.将上述方法应用于某工业汽轮机的设计,并通过实例验证了该方法对于不同的设计要求,可以给出不同情况下的Pareto最优解集,是进行复杂产品概念设计过程建模的一种切实有效方法.

An approach for multi-disciplinary process modeling based on the extended Petri net and NSGA- ]I algorithm was presented to support multi-disciplinary optimization of process modeling of conceptual design for complex product, solve function in conceptual design, and determine product synthesis optimal design. The important function of conceptual design was analyzed in multi-disciplinary optimization according to characteristics of the design process of complex product, and the establishment of Petri net model and implementation of NSGA-Ⅱ algorithm were given. A method based on transition sequences of the extended Petri net model used as NSGA-Ⅱ algorithm chromosomes, combined with the selection and crossover operator of Petri net model elements to carry on NSGA- Ⅱ optimization operation was implemented. The modeling method was applied to an industrial steam turbine design project for instance, and results demonstrated that it can give Pareto optimal solutions for the different design request under various circumstances, and it was a practical valid method for process modeling of conceptual design for complex product.