该模型的拓扑结构可以是任意型式，允许包含四边形单元、三角形单元和梁（杆）单元。
The model may be various non-simple topological structures and contain any combinations of beams, triangular elements and quadrilateral elements.
从球面三角理论出发，对球面四杆机构构件扭角和机构回路的关系进行分析；
Starting off from the theory of spherical triangle, an analysis was carried out on the relation between component twist angle of spherical four-bar linkage and circuit of mechanism.
结构元素包括杆元、平面梁元、空间梁元、平面三角板元、平面矩形板元和弯曲矩形板元等。
Structural elements contain bar, plane beam, space beam, triangular and rectangular plates with membrane stresses, rectangular plate element with bending deformations.
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