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Questions tagged [braking]

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Any information on magnetic braking with copper?

I have an engineering project where I have to design and build a model of a drop tower from a theme park. The tower itself can be no taller than 40cm. I plan to use magnetic braking with copper to ...
18jbrana's user avatar
0 votes
1 answer
41 views

How to model a driver's appropriate braking for deceleration, and throttle for acceleration for a car moving on a straight road?

A project team within my company is stuck on a conundrum and have asked me for some insights. They want to develop a driver model (mathematical or drawn) where input is the car's velocity profile, and ...
Balaji Harihar's user avatar
1 vote
2 answers
74 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 ...
James Strieter's user avatar
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 ...
Noil's user avatar
  • 182
3 votes
5 answers
827 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) ...
Azendale's user avatar
  • 131
0 votes
2 answers
82 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 ...
Shivam Goswami's user avatar
18 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 ...
NMech's user avatar
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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 ...
David's user avatar
  • 61
0 votes
0 answers
68 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....
Andrew's user avatar
  • 1
1 vote
0 answers
108 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 ...
KDGH's user avatar
  • 33
1 vote
0 answers
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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 ...
Manu H's user avatar
  • 426