2.4 Kinematic(运动学)rules of planar structures Stability of a triangle(三角形) 三> Rule 1:1 rigid body joint Rule 2:2 rigid bodies Rule 3:3 rigid bodies 同榜大学 土水2程学院 Rule 1:1 rigid body joint Rule 1:rigid body I and joint C connected by two links form a stable system without (a) redundant restraint provided that the two 777777777 links do not lie on the (b) same straight line 同傍大学 土本1程学院 12
Rule 2:2 rigid bodies To form a stable system with no redundant restraint provided that A)the link do not cross the hinge B)the three links do not intersect at the same point 同榜大学 TONGII UNIVERS Rule 3:3 rigid bodies To form a stable system with no redundant restraint provided that the three hinges(A,B and C) do not lie on the same straight line 同榜大学 土本1程学院 14 TONGJI UNIVERSITY