spherical four-bar meaning in English

球面四连杆组

Four parameters for determining the type of circuit of spherical four - bar linkage are defined . according to the relationship of these parameters , three types of circuit of spherical four - bar linkage are found , which is proved in view of geometry point . base on the theory of sphere triangle , an approach of identifying the circuit and branch defect of spherical four - bar linkage is proposed
首先提出了四个回路类型判断参数，根西安理工大学博士学位论文据这些参数之间的关系，将球面4r机构回路分为三种类型，并从几何的观点进行了证明;然后基于球面三角理论，提出了球面4r机构回路及分支缺陷识别的转角符号法，而由空间第一组机构与其等效球面4r机构回路特性的等效性，此方法对空间第一组机构的回路和分支缺陷的识别同样有效。