Flywheel Inertia: Calculating Mass & Radius

  • Context: High School 
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    Flywheel Inertia
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Discussion Overview

The discussion revolves around calculating the inertia of a flywheel, particularly in the context of a project aimed at minimizing electricity consumption using a motor, flywheel, and generator system. Participants explore the complexities of inertia calculations, the feasibility of power output, and the implications of energy conservation laws.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • Some participants express uncertainty about the calculation of flywheel inertia, noting that the formula I=1/2(mass*radius²) may not apply to all shapes.
  • Others suggest modeling the flywheel in 3D CAD software to obtain inertia values directly.
  • There is a contention regarding the feasibility of generating more power than is input, with some arguing it is impossible due to energy conservation laws, while others propose that short bursts of power could be achievable.
  • Participants discuss the need to consider the angular speed and torque in relation to the flywheel's mass and design.
  • Some suggest breaking down complex shapes into simpler components to calculate inertia, while others emphasize the limitations of using a bicycle flywheel for significant energy storage.
  • Concerns are raised about the project's viability, particularly regarding the ability to sustain a 4kW output for 15 minutes.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the feasibility of the project or the calculations required for the flywheel's inertia. There are competing views on the potential for power generation and the implications of energy conservation.

Contextual Notes

Participants highlight limitations related to the assumptions about energy storage and the specific design of the flywheel system. The discussion reflects varying levels of understanding regarding the application of physical laws to the proposed project.

Who May Find This Useful

This discussion may be of interest to individuals working on energy systems, mechanical engineering projects, or those studying the principles of inertia and energy conservation in practical applications.

  • #31
Absolutely not possible
 
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  • #32
Flywheels are to store excess energy in part of a cyclic process and to release the stored energy in the next phase, not to supply continuous energy like a prime mover
 

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