基于设计结构矩阵的变型设计过程动态规划

摘要

针对目前变型设计过程模型主要限制在零件级的粒度,导致活动间关系赋值较为粗糙,且往往需要遍历所有可能的设计过程,时间长,效率低,不能满足产品设计过程中的动态变化等问题,提出了一种基于设计结构矩阵的变型设计动态规划方法.依据建立的变型产品设计活动层次结构模型,定义了参数级粒度的设计活动间约束关系及其优先级数值,通过对虚拟活动的打包和分解操作,实现复杂耦合条件下基于DSM的设计过程动态规划.以轴承产品设计过程为例,验证了该方法的有效性.%Existing models of variant design process were mostly built at part level,and activity relationship definition was coarsely grained.Design process planning had to traverse all of the possible design activities,which resulted in low design efficiency and bad dynamic adaptation.A dynamic planning method for variant design process based on design structure matrix (DSM) was presented.Firstly,the variant design activity hierarchy model was built,including product level,feature level and parameter level.According to the hierarchy model,the product design activities can be divided into six types.The constraint relationships and their priority values between design activities at each level were defined.Then,the concept of virtual activity was proposed considering that traditional DSM cannot deal with the dynamics of design process.By packaging and decomposition operations of virtual activities,dynamic planning of the design process under complex coupling condition was achieved based on DSM.The design process planning and execution were alternated with each other.With the selection of dynamic design activities,the design process planning was adjusted continuously so as to ensure optimal execution sequence of the design activities.Finally,the method presented was applied to develop the bearing design wizard.Compared with traditional methods,the method presented was easier to adapt to dynamic design process,and it improved process planning efficiency and shortened design time.