Lecture_05

Lecture_05 - 2 B Label the intersection of the two...

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Kinematics and Dynamics of Machines ENGR 3270U Lecture 5 Yuping He University of Ontario Institute of Technology September 22, 2008
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1.1 Chapter 2: Graphical Kinematic Analysis for Simple Mechanisms Example 1 Design a fourbar Grashof crank-rocker mechanism to give of rocker rotation from a constant speed motor input, and to provide a time ratio of 1:1.25. o 45
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1.2 Draw the output link in both extreme positions, in any convenient location, such that the desired angle of motion, , is subtended. 4 Calculate , , and using equations described. In this example, , , . B O 4 o 160 o 200 o 40 Draw a construction line through point at any convenient angle. 1 B Draw a construction line through point at angle from the first line.
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Unformatted text preview: 2 B Label the intersection of the two construction lines . 2 O The line now defines the base link. 4 2 O O Calculate the lengths of crank and coupler by measuring and and solve simultaneously: 2 2 B O 1 2 B O 1.3 Coupler + crank = 1 2 B O Coupler - crank = 2 2 B O Double check the Grashof condition. Example 2 1.4 Position Analysis Velocity Analysis Acceleration Analysis 1.5 2.4 The Velocity Image Theorem Notation Theorem Given the triangle PQR in a rigid body, the triangle pqr in the velocity diagram will be similar to triangle PQR, rotated from PQR by in the positive direction, and magnified by the factor . o 90 1.6 Example:...
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Lecture_05 - 2 B Label the intersection of the two...

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