Difficulty with band type brake

Join the discussion
Ask a follow-up here, or get your own question answered by working scientists, mathematicians and engineers — people, not an autocomplete.
Real named experts · corrections over time · the nuance an AI answer skips
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:
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.
 
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.