Acceleration Analysis_Seibi

Acceleration Analysis_Seibi - Acceleration Analysis MEEG439...

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1 Acceleration Analysis MEEG439 SPRING 2006
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2 Vector Derivation Vector Form: / A dV dt = r r / / j j PA PA V dR dt pje d dt p je θ ϖ = = = r r ( 29 ( 29 2 tangential normal acc. acc. / / / j PA PA j j j j A dV dt d p je dt jp e d dt j e d dt p je p e α = = = = + = - r r Angular acceleration: / d dt =
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3 Tangential acceleration depends on direction of rotation Normal acceleration depends on velocity magnitude, but not direction P A P,normal A P,tangential A P ϖ
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4 4-Bar Linkage A B C O 2 O 4 A B n A B/A n A B t A B/A t A A t A A n ? ? ?
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5 4-Bar Graphical Acceleration Construction A A t A A n A B n A B/A n Start   here known known known known orientation  known orientation  known A B/A t A B t A B = A A  + A B/A
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6 4-Bar: Completing the Acceleration Polygon A A t A A n A B n A B/A n Start   here known known known known orientation  known orientation  known A B/A t A B t Intersection  of 2 unknown   tangential acc.
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7 4-Bar Acceleration Vectors A A t A A n A B n A B/A n Start   here A B/A t A B t A B A A A B/A
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Acceleration Analysis_Seibi - Acceleration Analysis MEEG439...

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