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Difficulty with band type brake

  1. Apr 6, 2017 #1
    1. The problem statement, all variables and given/known data

    What is the brake torque and the needed force to stop the drum.
    Photo of problem: https://gyazo.com/5c814dc6791b29362cc2835dacf7005a
    5c814dc6791b29362cc2835dacf7005a.png

    Data not on photo: Max pressure is 0.7MPa and friction coefficient is 0.2.

    2. Relevant equations
    T=(P1-P2)D/2
    p=2P/bD
    dP-fdN=0
    dN=Pdθ
    3. The attempt at a solution
    The only thing I've been able to do is use p=2P/bD and rearange it to get F=8.68N
    I am unsure of what dθ is supposed to be since the band lifts up on a portion of the drum.
     
    Last edited by a moderator: Apr 6, 2017
  2. jcsd
  3. Apr 6, 2017 #2
    This looks like a textbook problem, and I suspect that the intent is that you use the given geometry, neglecting any lifting of the band.
     
  4. Apr 7, 2017 #3

    CWatters

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    There seems to be some information missing? Any braking force will eventually stop the drum if it's not being driven.
     
  5. Apr 7, 2017 #4
    This was all the data I was given in the problem. There might be some eqations I forgot but the data is all there, at least what the teacher put.
     
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