If a 1000kg Mass resting on a friction free airbed....

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Discussion Overview

The discussion revolves around the recovery of electrical braking energy from a 1000kg mass that is accelerated and then allowed to decelerate on a friction-free airbed. Participants explore various scenarios, including the use of magnetic components and alternative methods of energy recovery.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about the percentage of electrical braking energy that could be recovered from a moving 1000kg mass using modern technology.
  • Another participant suggests that if the mass is a magnet moving through a coil of a linear motor, efficiencies could range from 95% to 98.5%, depending on the technology used, including superconductors for potentially higher efficiencies.
  • A participant clarifies that they are discussing a non-magnetic mass and questions the feasibility of using a 1000kg magnet as suggested.
  • Questions are raised about the conditions affecting the mass, such as whether it can be attached to other objects, how long it will remain on the track, and the influence of air resistance.
  • Another participant proposes the idea of using elastic collisions with a magnetic mass to facilitate energy recovery.
  • Concerns are expressed about the necessity of acceleration and deceleration, with suggestions for using springs or raising the ends of the track to improve efficiency.

Areas of Agreement / Disagreement

Participants express differing views on the methods of energy recovery and the feasibility of using magnetic components. There is no consensus on the best approach or the implications of various conditions affecting the system.

Contextual Notes

Participants have not fully resolved the assumptions regarding the nature of the mass (magnetic vs. non-magnetic) and the specific conditions under which energy recovery would occur. The discussion includes various hypothetical scenarios that remain unverified.

Fizzics
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Question: If a 1000kg Mass resting on a friction free airbed is accelerated from zero to 1 Metre per second by a drive motor, then the motor is disconnected, how much electrical braking energy could be recovered from the moving mass in percentage terms using modern technology. Thank you in advance for your considered replies which should be very helpful to me.
 
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If the mass is a magnet traveling through the coil of a linear motor, then the efficiency should be comparable to a power transformer - in the commercial sector, about 95 to 98.5%.
It depends on how "off-the-shelf" you require. If you want to use super-conductors, you could get higher efficiencies.
 
.Scott said:
If the mass is a magnet traveling through the coil of a linear motor, then the efficiency should be comparable to a power transformer - in the commercial sector, about 95 to 98.5%.
It depends on how "off-the-shelf" you require. If you want to use super-conductors, you could get higher efficiencies.
Hi Scott,
I'm talking about a non magnetic mass accelerating then deaccelerating in a linear fashion oscillating backwards and forwards, I was also wondering whether it is actually possible to have a 1000kg magnet working in the way you have suggested?
 
Am I allowed to attach something to it? If I do nothing, how long will it stay on the track? Is it also subject to air resistance?
If it's non-magnetic, I will need to "touch" it in some other way. For example,attaching it to a magnet or placing it onto a trolley.
What are your rules?

Can I arrange an elastic collision between the 1Mg mass and another 1Mg mass that is magnetic?
 
Hi Scott
Thanks for your feedback it has been very helpful and food for thought, I hope to come back with a reply to your last question in the next couple of days.
 
Fizzics said:
I'm talking about a non magnetic mass accelerating then deaccelerating in a linear fashion oscillating backwards and forwards,
Why accelerate and decelerate if you do not need to? A big spring at each end of the track, or one mounted on the cart would be more economical.
If it was a railway I would advocate raising the ends of the track. If you needed a longer time at the ends a flat "landing" could be provided.
 

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