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Consider the Fig 4.5 that shows a four bar mechanism,

Four Bar Mechanism” = C

Here,

Velocity at point B, VB = 1. AB = 0. BO

Or,

0 = 1. AB/ BO

 

Velocity at point C, VC = 2. CD = 0. CO

Or,

0 = 2. CD/ CO

 

Using the above two equations, we get the following ratio-

1/ 2 = CD/ AB . BO/ CO