Most efficient way to convert rope movement (KE) to rotational KE?

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Discussion Overview

The discussion centers around the efficient conversion of kinetic energy from a moving rope into rotational kinetic energy for a shaft that drives a generator. Participants explore the mechanics of this energy transfer and seek to maximize electrical energy output, addressing various factors that may influence efficiency.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant requests resources for maximizing the conversion of kinetic energy from a moving rope to rotational kinetic energy, emphasizing the goal of maximizing electrical output.
  • Another participant suggests that understanding how the speed of the rope varies with load is crucial for addressing the efficiency question.
  • A different participant notes the need for a clearer description or diagram of the system to assess efficiency, mentioning that a good belt/pulley system can achieve high efficiency but may not directly relate to kinetic energy conversion.
  • Concerns are raised about the properties of the rope, particularly its resistance to bending and unbending, which could contribute to efficiency losses.
  • One participant questions the choice of using a rope for power transfer, suggesting that belts and chains are more commonly used for such applications.

Areas of Agreement / Disagreement

Participants express varying opinions on the efficiency of the proposed system and the appropriateness of using a rope. There is no consensus on the best approach or the specifics of the system design, indicating multiple competing views and unresolved questions.

Contextual Notes

Limitations include a lack of detailed information about the system's design, the properties of the rope, and how the speed of the rope interacts with the load, which are all critical to understanding efficiency in this context.

narayan821
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I've got a moving rope that turns a shaft, which then turns a generator to create electricity. Please point me to a good resource that guides me to perform this efficiently. I would like to maximize the conversion of kinetic energy of the pulled rope system into rotational kinetic energy of the shaft, and maximize electrical energy output.
 
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I don't think we can answer this unless you describe how the speed of the rope varies with load.
 
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narayan821 said:
I've got a moving rope that turns a shaft, which then turns a generator to create electricity. Please point me to a good resource that guides me to perform this efficiently. I would like to maximize the conversion of kinetic energy of the pulled rope system into rotational kinetic energy of the shaft, and maximize electrical energy output.
This is very vague. We need to see a diagram or get a much better description to know what the system is doing. But it seems like it should be trivial to make it very efficient: a good belt/pulley system can run upwards of 95% efficient.

...however, they aren't really dealing in kinetic energy, they are transforming work. There are situations where kinetic energy may be desired, but without knowing what yours is, I can't say if it is one.
 
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We also need to know the properties of the rope. Resistance of the rope to bending/unbending will be one source of efficiency loss.
 
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Welcome to PhysicsForums. :smile:
narayan821 said:
I've got a moving rope that turns a shaft, which then turns a generator to create electricity.
Why are you using a rope? There's a reason that belts and chains are used much more for this type of power transfer application...
 
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