In the sketch shown in Figure 3 the disk cam is used to posi

In the sketch shown in Figure 3, the disk cam is used to position the radial flat-faced follower in a computing mechanism. The cam profile is to be designed to give a follower displacement S for a counter-clockwise cam rotation theta according to the function S = k theta2 starting from dwell. For 60degree cam rotation from the starting position, the lift of the follower is 10 mm. Determine the distance R and 1 when the cam has been turned 45degree from the starting position.

Solution

The loaded four wheel trailer shown in Figure P8.10 has a total mass of 5t and is pulled along a level road. Average resistance to motion (friction and windage) is 2 per cent of the total weight and acts at the same horizontal level as the applied force P. Determine the normal reaction at each of the front and rear wheels when the trailer moves:

a) at constant velocity

b) with forward acceleration 1.5m/s².

(Average resistance to motion is 2% of total weight is not required.)