Lecture_4_-_Posit_4-Bars - ME 371 Chapter 4 Position...

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ME 371 Lecture 4 1 ME 371 Chapter 4 Position Analysis 4-Bar Linkages
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ME 371 Lecture 4 2 4-Bar Linkages Crank-rocker Slider-crank Cam-follower
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ME 371 Lecture 4 3 Grashof Condition • Simple relationship which predicts the behavior of a four-bar linkage’s inversions based only on the link lengths. (Inversion: Created by grounding a different link in the kinematic chain) • The linkage is Grashof : at least one link will be capable of making a full revolution with respect to the ground plane • The linkage is Non-Grashof : no link will be capable of a complete revolution relative to any other link.
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ME 371 Lecture 4 4 Grashof Condition S= length of the shortest link L= length of the longest link P= length of one remaining link Q= length of the other remaining link •Type I : S + L < P + Q (Grashof) •Type II : S + L > P + Q (Non Grashof) •Type III : S + L = P + Q
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ME 371 Lecture 4 5 Type I - Grashof S+ L< P+ Q – and ground either link adjacent to S - Crank-rocker
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Lecture_4_-_Posit_4-Bars - ME 371 Chapter 4 Position...

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