Questions tagged [braking]

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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 ...
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0 answers

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?
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6 votes
5 answers

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 ...
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3 votes
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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 clean/dry steel on steel has a (static) ...
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0 votes
2 answers

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

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

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 ...
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0 votes
0 answers

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....
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1 vote
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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 ...
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1 vote
0 answers

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 ...
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