162A 3 - Velocity - MA

# 162A 3 - Velocity - MA - 162A. Introduction to Mechanisms...

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162A. Introduction to Mechanisms and Mechanical Systems Chapter 3: Indices of Merit & Mechanical Advantage

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Indices of Merit s What makes a good mechanism or a bad one? b Velocity Ratio b Displacement Ratio b Mechanical Advantage b Transmission Angle s We study this so we can turn around and exploit what makes it a good one for your purpose
Velocity Ratio Freudenstein’s theorem s We saw that the ratio of angular velocity of the output link to that of the input link is inversely proportional to the segments into which the common IC cuts the line of center s Freudenstein’s theorem makes use of the line connecting ICs P 13 and P 24 , called the collineation axis. An extremum of the velocity ratio in a 4-bar linkage occurs when the collineation axis is perpendicular to the coupler link s Because R P12P14 is the fixed length, the extremes of the velocity ratio occur when R P24P12 is minimum or maximum s We use velocity ratio to design an appropriate 4-bar linkage

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## This note was uploaded on 08/08/2011 for the course MAE 162A taught by Professor Glenn during the Spring '08 term at UCLA.

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162A 3 - Velocity - MA - 162A. Introduction to Mechanisms...

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