3级及4级机构加速度分析图解法

平面连杆机构中,连杆平面速度瞬时极的加速度α,取决于拐圆的位置和大小。利用α,的这一性质作3级机构和4级机构的加速度分析是本文的一点新意。加速度分析所需的各构件的角速度值通过速度瞬心求出。作为数值例子,用表格形式给出两种机构的位置、尺寸参数,瞬心位置和角速度值。

A Graphical Method for Acceleration Analysis of Third and Fourth Order Linkages

The acceleration a, of instant pole of the couple of a linkage depends on the location and magnitude of inflexion circle of the coupler. It is a novel idea in this paper that, according to this characteristic of a., the acceleration analysis for third and fourth order linkages is made. The angular velocity values of all links requisite for acceleration analysis are found through the use of instantaneous centers of velocity. As a numerical example, the parameters of location and dimension, location of instantaneous centres, and angular velocity values of the two previous linkages are given tabularly.