The crank of a slider crank mechanism rotates clockwise at a constant speed

of 300 rpm. The crank is 150 mm and the connecting rod is 600 mm long.

Determine :

(i)

linear velocity and acceleration of the mid-point of the connecting rod,

and

(ii)

angular velocity and angular acceleration of the connecting rod, at a

crank angle of 45 from inner dead centre position.

Note: Since D is the midpoint of AB, therefore d' is also midpoint of vector b' a'. Join o' d'. The vector o' d' represents the acceleration of midpoint D of the connecting rod i.e. aD.

By measurement, we find that aD = vector o' d' = 117 m/s2

Given: Lift = 40 mm Rise = ¼ x 360 = 900 Fall =1/6 x 360 = 600 Dwell = 1/10 x 360 =360