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Module 1 - Physical Acoustics

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Intro  ::   Acoustics  ::   Vibration  ::   Waves  ::   Resonance

Resonance

Physical systems will resonate when excited by a force applied at a specific frequency. Consider a simple mechanical system: a child in a swing. The swing has a natural frequency that is determined by its length. If the swing is given a small push at the right time in each cycle, its amplitude gradually increases. This is an example of resonance.

To successfully complete this chapter you should...

  • Read chapter 4 in your text book (pages 53 - 62).
  • Carefully study the important concepts on resonance.
  • Be able to describe the nature of resonance.
  • Be able to calculate the resonant frequencies for vibrating strings and pipes.
  • Be able to draw the resonant modes for strings in pipes.

Important Concepts

Partials
Harmonics
Overtones
Open and closed pipes
Acoustic impedance
Sympathetic vibration

Copyright 2008, by the Contributing Authors. Cite/attribute Resource . admin. (2005, January 25). Module 1 - Physical Acoustics. Retrieved January 07, 2011, from Free Online Course Materials — USU OpenCourseWare Web site: http://ocw.usu.edu/Electrical_and_Computer_Engineering/Science_of_Sound/Module_1_-_Physical_Acoustics_3.htm. This work is licensed under a Creative Commons License Creative Commons License