id216_fall2011_wk11_mechanismDesign_II

id216_fall2011_wk11_mechanismDesign_II - Week 11: Mechanism...

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Unformatted text preview: Week 11: Mechanism Design II Seok-Hyung Bae (seokhyung.bae@kaist.ac.kr) Product Design Engineering ID216 KAIST Product Design Engineering ID216 KAIST Contents Cleghorn, Mechanics of Machines, Oxford University Press, 2005 Ch 2 & 3 1 Product Design Engineering ID216 KAIST Pt Kinematics in Cartesian Coordinates Point B in planar motion Position Velocity Acceleration 2 j r i r r y BO x BO BO ) ( ) ( B y BO x BO BO BO v j r i r r dt d v ) ( ) ( ) ( B y BO x BO BO BO a j r i r v dt d a ) ( ) ( ) ( Product Design Engineering ID216 KAIST In Radial-Transverse Coordinates Point B in planar motion Position Velocity Acceleration 3 r BO BO i r r B BO r BO BO BO v i r i r r dt d v ) ( B OB OB r OB OB BO BO a i r r i r r v dt d a ) 2 ( ) ( ) ( 2 Product Design Engineering ID216 KAIST 2 Moving Pts in Radial-Transverse Coords. Position of point B relative to point A 4 BA r BA BA i r r Product Design Engineering ID216 KAIST Relative Velocity btwn 2 Moving Pts Velocity of point B relative to point A 5 BA BA i r i r v BA BA r BA BA Product Design Engineering ID216 KAIST Acceleration of point B relative to point A Relative Acceleration btwn 2 Moving Pts 6 BA BA BA BA i a a i a a i r r i r r a C BA T BA r N BA S BA BA BA BA BA r BA BA BA BA ) ( ) ( ) 2 ( ) ( 2 Coupler or connecting rod Product Design Engineering ID216 KAIST 2 Points Separated by a Fixed Distance Given: Relative velocity Always perpendicular to the line segment joining the points...
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id216_fall2011_wk11_mechanismDesign_II - Week 11: Mechanism...

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