Question

The free body diagram bellow showing a hoist drum has a moment of inertia of 55 kgm2 and is used to raise a lift of mass 500kg with an upward acceleration of 2.5 m/s2. If the friction couple at the drum bearing is 0.35 KN m and the drum diameter is 1.5 m, Determine: 1. The torque required at the drum. 2. The power required after accelerating for 5 seconds from rest. Motion E ma Accelerated hoist; load raised

Answer 1

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a = R X uxo 2.5 = a = 3.33 rad/sec2 at block ng tring - ma BT-500 (9.8 +215) Ta 6150N by ca la To - TR- (Torque) I a T - 6150 X 1.5 2 - 350 =55X3.33 T 5145.65 Nom (ii after 5 sec woot 3.33 X5 wa 16.65 pa TX W 5145.65 x 16.65 p=85675.07 Watt

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