question archive A hoist drum raises a cage of mass 600 kg through a height of 120 m
A hoist drum raises a cage of mass 600 kg through a height of 120 m
Subject:Mechanical EngineeringPrice: Bought3
A hoist drum raises a cage of mass 600 kg through a height of 120 m. The drum has a mass of 250 kg and an effective diameter of 1 m and a radius of gyration of 0.36 m. There is a frictional torque of 200 Nm at the drum bearings. The cage initially has an acceleration of 1.5 m/s' until a velocity of 9 m/s is reached, after which the velocity is constant until the cage nears the top, when the final retardation is 6 m/s2. Find the: a) starting torque applied to the drum (3690 Nm) b) displacement of the cage during retardation. (6.75 m) c) time taken for the cage to reach to the top. (17.1 s) d) applied torque required for the cage to be raised at a constant velocity of 9 m/s. (3143 Nm)
