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ME 363: Mechanics of Machines

ME 363: Mechanics of Machines. Dr. A. Al- Abduljabbar Mechanical Engineering Department, King Saud University, Riyadh, Saudi Arabia. For the mechanism shown, find all instant centers of velocity & the velocities of points B and C . w 2 = 10 rad /s. Also find the mechanical advantage.

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ME 363: Mechanics of Machines

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  1. ME 363: Mechanics of Machines Dr. A. Al-Abduljabbar Mechanical Engineering Department, King Saud University, Riyadh, Saudi Arabia

  2. For the mechanism shown, find all instant centers of velocity & the velocities of points B and C. w2 = 10 rad/s. Also find the mechanical advantage Fi Fo Dr. Al-Abduljabbar

  3. 1. Get Primary Centers 2. Get Secondary Centers • A) Center (13):12, 23 & 14, 34 (1,3) • B) Center (24): 12, 14 & 23, 34 (2,4) (2,3) (1,2) (3,4) (1,4)at ∞ Dr. Al-Abduljabbar

  4. 3. Velocities 1. vA= vC.23 =w2* r2 = 10 (rad/s)* 2 (2cm) = 20 cm/s vA 2. vA= vC.23 =w3* rAC.13 3. vB=w3 * rBC.13 4. vC=w3* rCC.13 vB • From graph, measure lengths to get: • w3 =3.8 rad/s (from 2) • vB= 3.8 * 2.6 = 10 cm/s (from 3) • vB= 3.8 * 5.2 = 20 cm/s (from 4) Dr. Al-Abduljabbar

  5. 4. Mechanical Advantage vA G Fi E vB Fo Dr. Al-Abduljabbar

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