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A 55kg load is suspended on the end of a cable, the other end of which is wound around a drum of diameter 500mm. The drum is rotated by a motor which has a torque output of 180NM and this lifts the load through a vertical height of 35m. The drum has a moment of inertia of 25 kgm2. Mass (m) = 55kg d = 500mm Torque output (T) = 180Nm h = 35m %3D Moment of inertia (I) = 25kgm²

A 55kg load is suspended on the end of a cable, the other end of which is wound around a drum of diameter 500mm. The drum is rotated by a motor which has a torque output of 180NM and this lifts the load through a vertical height of 35m. The drum has a moment of inertia of 25 kgm2. Mass (m) = 55kg d = 500mm Torque output (T) = 180Nm h = 35m %3D Moment of inertia (I) = 25kgm²

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A 55kg load is suspended on the end of a cable, the other end of which is wound around a drum of diameter 500mm. The drum is rotated by a motor which has a torque output of 180NM and this lifts the load through a vertical height of 35m. The drum has a moment of inertia of 25 kgm². Mass (m) = 55kg d = 500mm Torque output (T) = 180Nm h = 35m Moment of inertia (I) = 25kgm2 (a) Determine the time taken to lift the load (b) Due to bearing wear, the drum bearing are replaced with heavy duty versions which have a friction torque rating of 10NM. Calculate the effect that this will have on the time to lift the load.
Transcribed Image Text:A 55kg load is suspended on the end of a cable, the other end of which is wound around a drum of diameter 500mm. The drum is rotated by a motor which has a torque output of 180NM and this lifts the load through a vertical height of 35m. The drum has a moment of inertia of 25 kgm². Mass (m) = 55kg d = 500mm Torque output (T) = 180Nm h = 35m Moment of inertia (I) = 25kgm2 (a) Determine the time taken to lift the load (b) Due to bearing wear, the drum bearing are replaced with heavy duty versions which have a friction torque rating of 10NM. Calculate the effect that this will have on the time to lift the load.
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