A PROOF OF THREE-RIGID PANEL RULE WITH INFINITE VIRTUAL HINGE ¹⁾

Based on the plane motion of the rigid body, two theorems of kinematic characteristics of the virtual hinge and the infinite virtual hinge are proposed and proved. On this basis, a proof of the three rigid panel rule with infinite virtual hinge is given, which can help understanding better the geometric composition of the plane system and developing a new geometric composition analysis method of the plane system