Difficulty with band type brake

Join the discussion
Registration is free. Ask a follow-up in this thread, or start your own.
Sign up Log in
3 replies · 2K views
torrgud
Messages
2
Reaction score
0

Homework Statement


[/B]
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.

Homework Equations


T=(P1-P2)D/2
p=2P/bD
dP-fdN=0
dN=Pdθ

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:

Discussion

Physics news on Phys.org
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.
 
There seems to be some information missing? Any braking force will eventually stop the drum if it's not being driven.
 
CWatters said:
There seems to be some information missing? Any braking force will eventually stop the drum if it's not being driven.

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.