1. Resonance
Science of Music
Fall 2005

2. Remember the Spring

3. The Result was OSCILLATORY MOTION
Time
Amplitude
etc.....

4. Sprung

5. Friction
Envelope Curve
Same Frequency
Energy Loss

6. Spring to Swing
When do you
PUSH ??

7. Video – Bowling Ball

8. Video Driving the Spring

9. Resonance is a GENERAL phenomenon

10. 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.

11. To remember -
Sound is moving energy!
Video

12. Meet Ough
Twang Sound ???
Twang Sound ???

13. At RESONANCE, this thing makes a lot of noise.
Where are we going?
sand
plate
Vibration
At RESONANCE, this thing makes a lot of noise.
Else, not.

14. Other Frequencies

15. Video on Plates

16. Back to the old guitar …

17. Little String … BIG force
What vibrations!

18. BIG Vibrations

19. Response vs Frequency
Frequency
Area of plate moving

20. 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.

21. Performer has some control.

22. Resonances of a guitar
point.

23. NEXT TIME
Bowing & More
String Stuff