What is the difference between SHM,oscillation and vibratory motion?

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Discussion Overview

The discussion focuses on the differences between simple harmonic motion (SHM), oscillation, and vibratory motion, exploring their definitions, types, and relationships. It includes theoretical and conceptual clarifications regarding these terms.

Discussion Character

  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants suggest that simple harmonic motion is a specific type of periodic motion, while oscillation is a more general term.
  • One participant notes that vibration may refer to mechanical oscillations around an equilibrium point, although they express confusion about its application in certain contexts.
  • Another participant distinguishes between oscillation, which involves the whole body moving as a rigid entity, and vibration, which often involves different parts of a body moving in different ways.
  • It is mentioned that simple harmonic motion is characterized by no energy loss, while damped simple harmonic motion involves energy dissipation but retains a sinusoidal form.
  • Wave motion is described as distinct from oscillations and vibrations, involving multiple oscillators that transfer motion or energy to one another.
  • One participant emphasizes that vibration and oscillation are qualitative terms, whereas SHM has a specific mathematical definition.

Areas of Agreement / Disagreement

Participants express differing views on the definitions and relationships between SHM, oscillation, and vibration, indicating that no consensus has been reached.

Contextual Notes

There are varying interpretations of the terms used, and some definitions may depend on specific contexts or applications. The discussion highlights the complexity and nuances in the terminology.

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What is the difference between SHM ,oscillation and vibratory motion?

How many types of oscillations/vibratory motion are there?
If shm is one type of oscillation the what are the other types?

Can anyone please explain?
 
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Different people probably use the terms a bit differently...

Simple harmonic motion is typically considered to be a type of periodic motion...and it may decay or not as used in everyday language.

Oscillation is a more general term,...

oops: I just checked Wikipedia...and they refer to an oscillating weight on a spring and as
simple harmonic motion...and as 'oscillations' in another article...

Wiki says:
Vibration is a mechanical phenomenon whereby oscillations occur about an equilibrium point.
I never heard of it used that way.

Aboard a boat, one refers to 'engine vibration' meaning the engine is missing, maybe a mount is loose, or maybe the drive train is out of alignment...as in a bent propeller.
I'd love to know where the 'equilibrium point' is in such a situation.

So Ill change my opening line to 'there is no consistency' ...
 
OK.

Oscillation and vibration mean basically the same thing,

However

The term oscillation is usually reserved for periodic motion in which the whole body particpates as a rigid body, eg the oscillation of a mass on a spring or the oscillation of a pendulum. In essence the whole of the body is doing the same motion.

The term vibration usually refers to some kind of motion where one part of the body goes one way and another part goes another way. This usually means flexural vibration and larger objects such as buildings or bridges or electric cables. You can here cables vibrating in the wind where they are acting like guitar strings and different parts of the string are exefcuting different motions.

Simple harmonic motion means that there is no loss of energy to for instance friction so once set going the oscillation will never cease. It is characterised by a sinusoidal displacement graph.
Damped simple harmonic motion introduces some form of energy dissipation whilst maintaining the sinusoidal form.

You should also note that wave motion is different again.

Oscillations, vibrations and SHM refer to one one single vibrating or oscillating entity.

Wave motion occurs when there are many similar oscillators that have some form of coupling to transfer the motion or energy from one to the other.
 
Last edited:
AFAIK vibration and oscillation are general terms to describe behaviour qualitatively. And SHM means something more specific (mathematically) [itex]\ddot{x}=-kx[/itex]
 

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