Questions tagged [braking]
The braking tag has no usage guidance.
10
questions
1
vote
2
answers
65
views
Is it normal for freight trains to require an external braking mechanism?
Today I heard a claim that the recently derailed train in Ohio was physically incapable of stopping except at its normal stops.
I am skeptical of that claim because:
Normally a vehicle contains ...
- 111
0
votes
0
answers
11
views
Can electronic brakeforce distribution (EBD) continuously vary the brake torque applied at each wheel?
It's a simple question, but I haven't been able to find an answer to it. Can an EBD system vary brake torque continuously, as opposed to the pulse-based mode of operation of the typical ABS?
- 101
6
votes
5
answers
3k
views
Could a mainspring be used to generate train acceleration during starting-up from the kinetic energy stored during its slowing down?
When waiting for the underground, I've always been wondering why we could not absorb the kinetic energy of the train to slow it down at the station and then to release this energy to help it ...
- 182
3
votes
5
answers
736
views
Why can't trains stop in 2x the distance of trucks from the same speed?
It is my understanding that every axle on a modern train has brakes.
According to this page https://www.engineeringtoolbox.com/friction-coefficients-d_778.html clean/dry steel on steel has a (static) ...
- 131
0
votes
2
answers
66
views
What will be the force F for the given brake system?
I am getting two ways to find F. One is Fx0.2=30 Nm which gives F=150N Other is Fx0.2-640x0.13=0 which gives F=416N I am confused which one is incorrect. I know problem is too basic but still not ...
16
votes
3
answers
5k
views
Why do heavy trucks use air brakes?
I was having a discussion today, which led to the question
why do heavy trucks still use air brakes?
To my knowledge, it has been used for at least 40 years (I remember that as a kid), and ...
- 24k
6
votes
5
answers
1k
views
Ways to brake an axle
I am currently studying Mechanical Engineering and am doing an assignment where I have to design a wire rope tensioner where a wire rope is unspooled from a drum, but the wire has to be at a specific ...
- 61
0
votes
0
answers
33
views
Way to keep object on linear rail in the position you leave it in despite smaller external forces?
Problem:
I have a rod on a linear rail system. This rod can be pushed forward or backwards. There is air blowing out of the front of the rod (~2 lbf) causing it to move to the back position by default....
- 1
1
vote
0
answers
53
views
Force necessary to resist motion due to torque on a drum brake
A drum is subjected to a counterclockwise torque of 16 in-lb. What horizontal force is necessary to resist motion?
Coefficient of friction = 0.40
Weight is neglected.
I'm having a hard time on this ...
- 33
1
vote
0
answers
31
views
Does westinghouse braking system prevent using anti-lock system?
This question concerns the Westinghouse braking system. If I understand correctly this video, in an emergency braking (e.g. in case of failure in main air pressure line) the pressure in the main ...
- 426