+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, find necessary force required for clockwise rotation of the drum in N.

(a) 32

(b) 64

(c) 96

(d) 128

The question was posed to me during an interview for a job.

This interesting question is from Differential Band Brake topic in section Brakes and Dynamometers of Machine Dynamics

1 Answer

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by (38.6k points)
Right option is (b) 64

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 = T2x150 – T1x35

P = 64N.

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