Numerical: Angular Velocity of Link in Four Bar Chain (ABCD Mechanism)

Problem Statement

In a four-bar chain ABCD, AD is fixed and is 150 mm long. The crank AB is 40 mm long and rotates at 120 r.p.m. clockwise, while the link CD = 80 mm oscillates about point D.
Given that links AB and BC are of equal length and angle ∠BAD = 60°, find the angular velocity of link CD.

Solution : Given Data

NAB= 120 r.p.m (clockwise)

AD = 150 mm (fixed)

AB = 40 mm (crank)

CD = 80 mm (oscillating link)

AB = BC

∠BAD = 60°

Solution of four bar chain angular velocity problem