Resonance

Science of Music

Remember the Spring

The Result was OSCILLATORY MOTION

Am

plitu

de Time

Sprung

m

kf

2

1

Friction

Same Frequency

Envelope Curve

Energy Loss

Springto Swing

Video – Bowling Ball

VideoDriving the Spring

Resonance is a GENERAL phenomenon

Solid Objects

All have their own modes of vibration. Each has its own resonant frequency. Musical Examples

Cymbals – (very melodic!) Drum Bell Guitar &similar stringed instruments.

To remember -

Meet Ough

Where are we going?

Vibration

platesand

At RESONANCE, this thing makes a lot of noise.Else, not.

Other Frequencies

Video on Plates

Back to the old guitar …

Little String … BIG force

BIG Vibrations

Response vs Frequency

Frequency

Are

a of

pla

te m

ovin

g

What’s Happening?? It’s all about energy.

String vibrates Gradually loses energy

The plates begin to vibrate and produce a strong sound which is what we hear.

The plates are vibrating in many modes at the same time.

As the string loses energy, it stops supplying energy to the plates.

The sound from the plates decrease with time as they run out of energy. Each mode has a different rate of energy loss.

Performer has some control.

Resonances of a guitar

point.