Question

Given: A mechanism is made up of link OA, AB, and DE. Pins D and E on link DE are constrained to move along straight guides. Link OA is pinned to ground at O and pinned to link AB at A. Link AB is also pinned to link DE at point B. Pin D moves to the right with a speed of Vp. For the position shown, find: (a) The location of the instant center for link DE. (10 pts.) (b) The location of the instant center for link AB. (10 pts.) (c) The direction of rotation for link AB -clockwise, counter-clockwise, or instantaneously at rest. (10 pts.) Provide an argument for your answer. VD

Answer 1

As the velocity at D is moves towards a Given, velocity at point is along horisontal direction. right, the velocity at pornt to moves towards an upwards. hence the direction of velocity cet is Ē is vatical dire ficu. linte DE center of Instant Draw SVE IC B WAE From IC, we can inspect the angular we do city of link D E is counto colockelse direction (cow] ie [wo 5]

From TC, we can find the direction of velocity at point is! The direction of velocity at point 5 is perpendiculas to the toline IC.B. and direction in the direction of angulad Velocity of link DE. From the dink of the point À moves in circula path, hence the velocity at point a À on the link oĀ is perpendicular to the dink OA le to the velocity at point A is along horizontal direction, either positive x-anes os negative axis. VA >) 01) CAT).

the Instant center of line AB Draw L B VA IC B A WAB

At Instant cento, هوا have only rotational motion only. From the inspection, we get the direction of velocity at point A and angul as velocity of denk AB. At Il, we can observe that the angelal velocity of link AB is clockwis direction only. hence, the direction of link AB clock wise direction L. and Velocity at point is horizontal direction towards de ft direction le Ja

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