基于基因模型的机构变异方案设计

针对传统机构变异的复杂性,分析了生物基因遗传和变异的机理与机构变异的相似性,总结出由遗传特征、变异特征和联结特征集等特征组成的构件、运动副基因表达式和由构件特征矩阵、运动副特征矩阵和联结关系矩阵等3个矩阵组成的机构基因表达式,并根据机构基因表达式建立了机构的基因模型.为保留机构遗传特征归纳出机构基因变异的3条变异法则,模仿生物的基因突变根据变异法则规定了6种对机构基因模型的变异运算,即自发变异、极端变异、互换变异、反向变异、重组变异和杂交变异等.利用机构的基因模型对由平面六杆机构、平面四杆机构和棘轮机构等组成的原机构进行基因变异运算获得2种变异机构,对基于基因模型的机构变异方案设计的步骤进行了说明,证明了该设计的可行性.

Gene model based conceptual design of mechanism variation

Traditional mechanism variation is complex. The genetic expressions of component and kinematic pair composed of inheritance characteristic, variation characteristic and the set of link characteristics, and the genetic expressions of mechanism composed of components characteristic matrix, kinematic pair characteristic matrix and link relation matrix, were summarized by analyzing the comparability between the principle of biologic genetic inheritance and variation and that of  mechanism variation. And a mechanism gene model was created according to the genetic expressions of mechanism. Three rules of mechanism gene variation, according to which six variation operations on the mechanism gene model including voluntary variation, extreme variation, interchanged variation, reversed variation, recombinant variation and hybrid variation were proposed by simulating biological gene mutation, were concluded in order to reserve the inheritance characteristics of the mechanism. The steps of gene model based conceptual design of mechanism variation were explained and the design feasibility was proved by having obtained two variation mechanisms using the method proposed to take variation operations on the original mechanism composed of planar six bar mechanism, planar four bar mechanism and ratchet mechanism etc．