# CDO 463 3 Resonance

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1. String vibrate at
even and odd multiples
2. Tubes vubrate at
odd multiples
3. Free vibration
• object vibrating at its natural frequency
• ex) tuning fork, string, column of air in a tube closed at one end
4. Natural frequency is determined by
length, mass, and stiffness of an object
5. forced vibration
• using on vibrating system to cause another to vibrate
• ex) holding a tuning fork on a table - forcing it to vibrate
6. driving force
the energy being supplied (tuning fork)
7. driven system
the system to which the energy is being supplied (table)
8. Will every driving force make the driven system vibrate?
NO
the frequency of the driving force and the natural frequency of the driven system
10. Resonance occurs
when the frequency of te driving force is at or near the driven system
11. the closer the frequency of the driving force is to the natural frequency od the driven system...
the lower the amplitude of the forced vibration
12. Resonance curves (frequency response curves) show the relationship between
the frequency of the driving force and the amoplitude of forced vibration.
13. Peaks of amplitude occur when
the frequency of the driving force matches the natural frequency of the driven system (resonance).
14. lightly damped
high amplitude of forced vibration, restricted range of frequencies resonated
15. highly damped
low amplitude of forced vibration, broad range of frequencies resonated
16. Is the vocal tract highly or lightly damped?
highly damped
17. What can be resonated?
Anything that can vibrate
18. Examples of air-filled resonators
• tube
• simple Helmholtz resonator
• double Helmholts resonator
19. What are important characteristics of air filled resonators?
• volume
• length of neck
• opening
20. Which example if an air-filled resonator is a model for the vocal tract?
Double Helmholts Resonator
21. In the double Helmholtz resonator,
l1 and A1 represent
l2 and A2 represent
• tongue constriction
• lip constriction
22. In tube vibration f0, f3, f5 correspond with
• fo = F1
• f3 = F2
• f5 = F3
23. In string vibration, f0, f2, f3, f4 correspond with
• f0 = F1
• f2 = F2
• f3 = F3
• f4 = F4
24. The resonant frequencies of the air-filled tube will match the..
natural frequencies of the tube when pulsed
25. Perturbation theory describes
the effects of constriction, or perturbations, on the resonant frequencies / quality of sound of the tube
26. Pertrbation theory explains that
• constriciton near antinodes decrease resonant frequencies
• constriction near nodes increase resonant frequencies
27.   The tube will resonate frequencies that
match its natural frequencies
28. Resonance are...
Filters are...
• peaks
• valleys
29. filters
opposite sid eof the rsonator coin
30. resonation looks at the
output in terms of the frequencies that are enhanced
31. filters look at
the output in temr of the frequencies that are absorbed or reduced in energy
 Author: shanamd2011 ID: 177889 Card Set: CDO 463 3 Resonance Updated: 2012-10-16 00:18:50 Tags: Basic Acoustics Resonance Folders: Description: Resonance Show Answers: