变拓扑机构可变运动副设计目录研究

可变运动副作为变拓扑机构改变拓扑结构的关键所在,其结构设计是变拓扑机构构型综合的难点.基于可变运动副拓扑变化方式的研究,构建可变运动副设计目录,用于可变运动副的结构设计.分别针对可变运动副的改变轴线方位、改变数目和改变类型等三类拓扑变化过程,分析可变运动副的约束变化特征,并采用运动副约束函数的算术运算进行描述.在归纳设计可变运动副结构形式的基础上,对可变运动副拓扑变化方式、约束变化特征和对应结构等设计信息进行分类和汇编,构建可变运动副设计目录.应用实例表明,采用可变运动副设计目录,能快速有效地设计可变运动副结构,为含可变运动副的变拓扑机构构型综合提供了方便.
Variable joints are the crucial structures for changing topological characteristics of variable topology mechanisms. Design of variable joints is a challenge for the type synthesis of variable topology mechanism. Based on the concept and method of design catalogue,the design catalogues of variable joints were proposed to design the structures of variable joints. Adopting the arithmetic operation of constraint functions,the constraint variation features of variable joints were described in the three processes of topological variations (including changing the axis azimuth,changing the numbers and changing the types),respectively. Based on summarizing and designing the corresponding variable structures of general joints,the design catalogues of variable joints were established through classifying and compiling the design information,including the ways of topological variations,constraint variation features,and structures of variable joints. Meanwhile,the example shows that the design catalogues of variable joints are applicable to design the structures of variable joints for variable topology mechanisms effectively. This method provides convenience for type synthesis of variable topology mechanisms with variable joints.