Lecture_20 - Kinematics and Dynamics Kinematics and...

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Unformatted text preview: Kinematics and Dynamics Kinematics and Dynamics of Machines of Machines ENGR 3270U ENGR 3270U Lecture 20 Lecture 20 Yuping He University of Ontario Institute of Technology November 26, 2008 1.2 Chapter 13 Static Force Analysis of Mechanisms 13.1 Introduction Conditions: (1) Mechanisms deliver forces or components subject to loads; (2) Motion is slow or inertial forces can be neglected. Motivations: (1) Conversion of kinematic designs into physical mechanism design requires consideration of loads on components; (2) For safety purposes, component stress or deflection analyses are required under critical situations. Methods: (1) The basis of all static analysis is Newtons third law; (2) Static equilibrium equations should be generated; (3) Free-body diagram method is a useful tool. 1.3 13.2 Forces, Moments, and Couples j F i F F y x + = 2 1 F F F + = j r i r r y x + = F r M F F = Force: Addition of forces: Arm position vector : Moment of a force about a point: F r F P F r M n F F = Two noncollinear forces forming a couple: F F n r F 1.41....
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Lecture_20 - Kinematics and Dynamics Kinematics and...

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