【摘要】 以四连杆机械为例,其自由度是1,整个机构的质心只需一个独立参变数描述.故机构的质心对该参数的导数等于零即机构质量中心保持固定的充要条件.通过对线性方程组基础理论的巧妙利用,给出了四连杆在工作状态下质心保持稳定的几何特征.更多还原

【Abstract】 Take the four-bar linkage for example,the freedom of motion is 1,and only one independent parameter is required in the description of the entire centroid of the mechanics. Therefore,that the differential coefficient of the mechanical centroid compared with the parameter is zero is the necessary and sufficient condition to the maintaining of the stability of the mechanical centroid. With the tactful employment of the basic theory of linear equations set,the paper presents the geometrical features which are displayed with the stability of the centroid at the working state of the four-bar linkage.更多还原