Passion LOVE to Create.ppt

Passion LOVE to Create Enthusiasm is one of the most powerful engines of success. When you do a thing, do it with all your might. Put your whole soul into it. Stamp it with your own personality. Be active, be energetic, be enthusiastic and faithful and you will accomplish your object. Nothing great was ever achieved without enthusiasm Ralph Waldo Emerson American author, poet and philosopher The Theory of Machines and Mechanisms Chapter 2. Kinematic Analysis Sun Zhihong Zhsun@dhu.edu.cn Room307,No.3 Teaching Building Main Topics of Today Kinematic analysis by vector equation and graphic method 3.Kinematic analysis by vector equation and graphic method Velocity of points at the same link VB = VA + VBA Notice: VBA is the relative velocity of point B to point A, it is perpendicular to AB and has the same direction of ω 3.Kinematic analysis by vector equation and graphic method Example 1 In a four-bar linkage mechanism ABCD, the length of link AB, BC, CD and AD are known, and the angular velocity of link AB is ω1. Find ω2，ω3，VC，VE. 3.Kinematic analysis by vector equation and graphic method The velocity of two coincide points at two links VB2=VB1+VB2B1 3.Kinematic analysis by vector equation and graphic method Velocity polygon Velocity polygon is similar to the shape of the link, e.g. velocity polygon △abc ∽ link △ ABC, but the corresponding sides are vertical to each other, and the order of the point are same. VA 3.Kinematic analysis by vector equation and graphic method Example 3: the angular velocity of link AB and the size of all links are known. Please find ω5 求VB 用速度公式: VB ? =? ω1LAB 求VC 用同一构件两点之间的速度矢量方程: VC ? =? VB? +? VCB 求VD2（VD4） 用速度影象法 求VD5 用两构件重合点之间的速度矢量方程 求ω5 用速度公式 3.Kinematic analysis by vector equation and graphic method General laws of vector equation and graphic method 3.Kinematic analysis by vector equation and graphic method 3.Kinematic analysis by vector equation and graphic method Exampl