+1 vote
in Machine Dynamics by (34.3k points)
For the given figure, the brake can sustain a torque of 350 N-m and coefficient of friction between the band and drum is 0.3, If the drum rotates in anticlockwise direction, find force in N.

(a) 804

(b) 756

(c) 850

(d) 900

The question was asked during an online interview.

My question is taken from Differential Band Brake topic in chapter Brakes and Dynamometers of Machine Dynamics

1 Answer

0 votes
by (38.6k points)
The correct option is (a) 804

Easiest explanation: 2.3 log(T1/T2) = μ.θ = 0.3×3.93 = 1.179

          log(T1/T2) = 1.129/2.3

              = 0.51

      T1/T2 =  3.255

Braking torque = (T1-T2)r

T1-T2 = 2000

therefore T1 = 2887N T2 = 887N

Px500 = T1x150 – T2x35

P = 804N.

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