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?
  9. Resonance is all about
    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
Card Set:
CDO 463 3 Resonance
2012-10-16 00:18:50
Basic Acoustics Resonance

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