Dynamics Mechanisms The SI units are used for all following

Dynamics - Mechanisms

The SI units are used for all following parameters. A single rotating link with the length: L_2 = 10, and mass: m_2 = 1. Its CG is on the line of centres at the 5 point (the middle point of the link). Its mass moment of inertia about its CG is I_G = 2. An external force, F_P, of 20 at 145degree is applied at point P. Its kinematic data are: link angle: theta_2 = 30degree; angular acceleration: alpha = 1 (clockwise); and the acceleration at CG: a_G = 110 at 270degree. (a) Develop the Free-body Diagram. (b) For this link, find force F_12 at pin joint O_2 and the driving torque T_12 (c) Find the shaking force and shaking torque (moment) acting on the ground fixed pivot

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.)