Classical Oscillator Resonance: Understanding & Amplification

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Discussion Overview

The discussion revolves around the concept of resonance in classical oscillators, exploring what occurs during resonance, the reasons behind amplification, and the relationship between mathematical descriptions and physical understanding. Participants share insights, examples, and suggest further reading materials.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant expresses uncertainty about the nature of resonance, questioning what happens and why amplification occurs when a system is configured to absorb maximum energy.
  • Another participant emphasizes the importance of understanding second-order linear ordinary differential equations (ODEs) with constant coefficients as foundational knowledge for discussing resonance.
  • A participant who has performed the relevant mathematical analysis feels that the discussion lacks a physical perspective, indicating a desire for explanations that do not rely heavily on mathematics.
  • One participant provides a thought experiment involving a pendulum and a knotted handkerchief to illustrate resonance, explaining how consistent application of force at the right moments leads to increased oscillation and energy transfer.
  • A reference is made to a previous thread discussing a resonant spring-mass system, noting that real mathematical analysis is necessary to generate relevant plots.
  • A later reply indicates that the explanations provided have clarified the participant's understanding of the topic.

Areas of Agreement / Disagreement

Participants express a mix of agreement on the need for a physical understanding of resonance, while also highlighting differing views on the role of mathematics in explaining the phenomenon. The discussion remains unresolved regarding the deeper implications of resonance and its amplification.

Contextual Notes

Some participants acknowledge the limitations of purely mathematical approaches and emphasize the need for conceptual clarity. There are also references to specific experiments that may not be universally applicable or fully detailed.

samreen
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for a classical oscillator. i kno when resonance happens. what i don't know is WHAT happens in resonance. and WHY it happens. I am very sketchy bt the details...is resonance happening when the system is oriented or configured to b able to absorb max energy? why the amplification? could u suggest reading material?
 
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Make sure you know how to solve second-order linear ODE with constant coefficients
If not,don't bother to think why
 


ive dun the math...for free, damped and forced. trouble is, it feels like math.not physics. which is what I've asked.
 


not physics. which is what I've asked.

I agree wholeheartedly. a Physicist should be able to explain most things without resort to complicated maths.

Try this: Either as a thought experiment or a real one.

Hang a very heavy weight to act as a pendulum.
Take your handkerchief and tie a knot in the end.
Attack the pendulum with your knotted kerchief by hitting the weight repeatedly with the knot, always in the same direction.

You will find that if you strike at random intervals, the pendulum will scarcely move.
If however you always strike at the same point in the motion of the pendulum the blows will add up and the oscillatory motion will increase.
Eventually you will be able to get a good steady swing going.

This is resonance (at very low frequency so you can see what is happening).
The weight is accepting small packets of energy at its resonant frequency. All these packets are reinforcing one and other so energy transfer is high.
You can also upset the oscillation by striking at the wrong moment - when the pendulum is going towards the knot. Do this enough times and you will slow or stop the oscillation.
If you want to demonstrate damping in this experiment use a piece of sponge rubber on a string. The sponge will introduce damping.
 


thanx guys...makes a load of sense now
 

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