The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω_{1} rad/s in the clockwise direction and the link OB turns with angular velocity ω_{2} rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

If ω/ω_{n} = 2, where co is the frequency of excitation and ω_{n} is the natural frequency of vibrations, then the transmissibility of vibration will the

A disturbing mass m1 attached to the rotating shaft may be balanced by a single mass m_{2} attached in the same plane of rotation as that of m_{1}, such that (where r_{1} and r_{2} are the radii of rotation of m_{1} and m_{2} respectively)