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Lecture05_ME343F09

Lecture05_ME343F09 - ME343-Dynamics of Machinery Mechanism...

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ME343-Dynamics of Machinery - Mechanism Design - Velocity Analysis Oct. 12 th , 2009
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Design of In-Line Slider-Crank Mechanism- Review 2 ) ( max 4 2 R L = Given: (ΔR 4 ) max 3 L does not affect the stroke of in-line slider-crank mechanism ) ( ) ( 2 3 2 3 1 2 L L L L AC AC - - + = - 1 2 max 4 ) ( AC AC R - = 2 max 4 2 ) ( L R =
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Time Ratio stroke quicker of Time stroke slower of Time = Q Some machine design applications require a difference in the average speed of the forward and return strokes. Typically the return stroke needs to be as fast as possible, so maximum time is available for the working stroke. A measure of the quick return action of a mechanism is the time ratio , Q : An imbalance angle , β will be apparent in a mechanism. ) 1 ( ) 1 ( 180 o + - = Q Q β Therefore, the desired Q can be used to determine the required β. β β - + = o o Q 180 180
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Design of Offset Slider-Crank Mechanism 2 1 2 L D C = 1 2 1 AC AC D C - = ) ( 1 2 2 1 2 AC AC L - = 2 3 1 L L AC - = 2 1 3 L AC L + =
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Example Design a slider crank mechanism with the following characteristics: Q=1.25 – ΔR 4 max =2.75”
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