瞬心无穷远近似直线导向机构综合及解域寻优方法  

Synthesis and Solution Region Optimization Method of a Straight-line Mechanism with Instant Center at Infinity

作　　者：钱卫香[1] 杨银烁 靳智超 屈卓成 Qian Weixiang;Yang Yinshuo;Jin Zhichao;Qu Zhuocheng(College of Mechanical Engineering,Xi'an University of Science and Technology,Xi'an 710054,China)

机构地区：[1]西安科技大学机械工程学院,陕西西安710054

出　　处：《机械传动》2023年第7期29-34,共6页Journal of Mechanical Transmission

基　　金：陕西省自然科学基金项目(2021JLM-01)。

摘　　要：对连杆平面瞬心趋向无穷远的一类平面四杆直线导向机构,在给定理想直线点位与机架一定铰点位置的设计条件下,提出一套通用机构综合模型。推导了机构综合解析求解公式,给出了机构综合及寻优方法示例。该方法可综合得到无穷多满足理想直线点位要求的直线机构,并可根据设计需求施加运动学约束,计算可行机构解域,绘制解域上感兴趣的运动性能分布图;设计者可准确快捷地从无穷多设计方案中找出满足约束的全局最优直线机构。综合示例表明,所提方法为瞬心无穷远直线机构综合这一类问题提供了新的解决思路;综合过程简单直观、通用性强,适用于瞬心无穷远具有2阶、3阶密切直线机构的计算机辅助设计,有利于这类机构设计质量的提升并有效压缩设计周期。A set of mechanism synthesis universal model is presented in this study.Given the expected straight-line and a fixed pivot,this model can solve the synthesis problem of the straight-line guide mechanism when the instant center tends to infinity in the coupler plane.In addition,mechanism synthesis formulas are derived and an example of mechanism optimization method is given.Based on the synthesis model,an infinite number of straight-line mechanism solutions that can satisfy the expected straight-line requirements are obtained.Then feasible solution regions are computed by imposing constraints.According to the design requirements,the designer can find promptly the optimal straight-line mechanism meeting constraints from an infinite number of mechanisms.The demonstration shows that this method provides a new way for straight-line mechanism synthesis with instant center at infinity,the synthesis process is simple and intuitive,and has universality.It is suitable for computer aided design of straight-line mechanism with second-order and third-order,which is beneficial to improve the design quality and compress the design cycle.

关 键 词：直线导向机构 瞬心无穷远 机构综合 机构解域 计算机辅助设计 

分 类 号：TH112[机械工程—机械设计及理论]