Watt-Ⅰ型六杆刚体导引机构的解域综合方法

Solution-region synthesis approach of a Watt-Ⅰ six-bar rigid-body guidance mechanism

给出了Watt-I型六杆机构尺寸综合的一种新方法.该方法对于刚体有限分离四位置问题通过建立机构解域,最终能够得到满足给定设计条件的全部可行解.本文首先给出解曲线公式,并介绍解曲线的映射和构成平面解域的方法.然后给出该类型机构的回路与分支缺陷判定方法.通过缺陷判定得到无缺陷的机构解可行域,从而使设计者能够得到满足更多设计要求的更优机构,避免选择机构的盲目性,提高设计效率.最后,通过综合示例说明本文所提出方法的综合过程,证明了方法的实用性和有效性.

A new approach of dimensional synthesis is introduced for Watt-I six-bar rigid-body guidance mechanisms. Through establishing the mechanism solution-region,this approach can get all feasible solutions for the finite separated four-position problem of the rigid-body in the end. This paper firstly gives the solution-curve formula and recommends the methods of solution-curve mapping and forming plane solution-region. After that,a circle and branch defects decision is proposed for this type of mechanism. Through this defect decision,the feasible region of no-defect mechanism solutions is acquired,which makes a designer be able to get much better mechanisms that meet much more design requirements,avoid the blindness of selecting mechanisms and improve the design efficiency. Finally,the synthesis process of the approach presented in this paper is illustrated through a synthesis example,which proves the practicability and effectiveness of this approach.