自然方程式在平面连杆机构综合中的应用

相邻两杆间均不能作相对整周转动的平面四杆机构(Nongrashof机构)的连杆轨迹曲线，广泛应用于非等速运动机构中。在连杆曲线以其特征参数分类的基础上，利用其特征参数的自然方程式，将创成曲线与理想曲线一致程度的判定问题，归结为曲线上的特征参数及自然方程式的一致程度的判定，进而用此方法进行了曲线创成机构综合，充分显示了该方法的有效适用性。

The synthesis of curve generating mechanisms

Nongrashof Planar Four-link mechanisms generate complex coupler curves with non uniform velocity when the driving link oscillates in such a manner that coupler and driven links belong to different composition loops in going and returning respectively. In this paper, a pattern matching method is presented for synthesizing the coupler curves of the nongrashof mechanism, The method consists of magnification or reduction of the coupler curves , arrangement of equidistant points on ideal and coupler curves, one-to-one correspondence of points on both curves so that the norm of their natural equations may be minimized and coordinate transformation of the coupler curves so that the maximum difference between both curves may be minimized.