具有迭代特征的复杂机械产品概念设计模型

NEW ITERATION-BASED CONCEPTUAL DESIGN MODEL OF COMPLEX MECHANICAL PRODUCTS

针对机械产品概念设计的复杂性,提出一种基于迭代的功能—行为—机构—结构模型(FBMS)。从机械产品设计的特点出发,研究复杂机械系统的功能、行为、机构和结构之间的关系,揭示行为和机构在功能到结构转换过程中的桥梁作用,由此提出基于行为和机构的映射关系,进而结合设计过程的迭代特征建立基于迭代的FBMS模型。在综合考虑该模型中各要素特点的基础上,给出其形式化描述方法。通过对迭代设计过程中行为和机构作用特点的分析,给出迭代设计的具体步骤及相应的迭代算法流程。以一个具体机械产品设计为例,对FBMS模型的有效性进行验证,并对其整体特性进行分析。结果表明,该模型有助于机械产品概念设计阶段的机构组合创新,以及功能与结构之间的优化匹配。

In view of the complexity of the conceptual design of mechanical products, an iteration-based function-behavior-mechanisms-structure （FBMS） model is proposed. According to the characteristics of the design of mechanical products, the close relationships among the function, behavior, mechanisms and structure of the mechanical systems are studied, which imply that the behavior and mechanisms are a bridge across function and structure. Therefore, a new model, which supports the iterative process in the conceptual design and fimction-behavior-mechanisms-structure mapping approaches, is established, further, the formal description method of the model is proposed by taking key points of the model into account. Based on the analysis of the operational characteristics of behaviors and mechanisms in iterative design process, the detailed steps of iterative design and the corresponding iterative algorithm are presented. Finally, the design of a real-life mechanical product is taken as an example to validate the effectiveness of the FBMS model, and then the integral characteristics of the model arc analyzed by comparing with those of existed models.The results show that the model is helpful for the innovative synthesis of mechanisms and optimal function-structure matching in the conceptual design.