基于B样条的凸轮式开关机构轮廓线设计方法

摘要/Abstract

摘要： 针对凸轮式开关机构轮廓线与力值曲线定量关系复杂、轮廓线形状描述困难的问题，采用B样条方法，依据能量理论研究了开关机构轮廓线的设计方法。给出了开关机构B样条曲线描述方程及其微分表达式，建立了机构内部弹性势能与外力功的关系式，提出了轮廓线逐步迭代设计算法。利用MATLAB设计了雨刷开关机构轮廓线，结果表明根据能量关系设计开关机构轮廓曲线能达到预期的力值要求,采用B样条曲线方程比高次多项式拟合方程更能有效提高轮廓线设计精度和开关设计质量。

关键词: 凸轮式开关, 轮廓线, 能量关系, B样条

Abstract: In order to investigate the problems of complex contour description and complex quantitative relationship between cam-type switching mechanism contours and force value curves, a design method of cam contour was suggested based on B-spline and energy theory. The descriptive and the differential equations of B-spline were given, the quantitative relationship equation between the internal potential energy and external work of switching mechanism was established, and the iterative design algorithm of mechanism contours was presented. A cam-type wiper switch contour was designed by using MATLAB and the suggested cam contour design method, which involved the energetic relationship equation and the iterative algorithm. The design results indicate that the derived contour may satisfy the expected force value curve requirements, and the derived force value curves by using B-spline are more effective in improving the contour precision and the switch performance than that by using high-order polynomial fitting curves.

Key words: cam-type switching mechanism, contour, energetic relationship, B-spline

中图分类号:

TH112

王伟, 姚华忠. 基于B样条的凸轮式开关机构轮廓线设计方法[J]. 中国机械工程.

WANG Wei, YAO Huazhong. Design Method of Cam-type Switching Mechanism Contours Based on B-Spline[J]. China Mechanical Engineering.

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