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Aerospace Vibration Frequency

  1. Sep 9, 2010 #1
    Hello all.

    I have a question about a wing model...

    The model I have is an airplane wing (airfoil) in a wind tunnel. The wing is supported at the quarter-chord length and the wing body is free to move.

    My model is in the time domain with an oscillatory force at 20 Hz applied to the wing. When I look at the results, I see an oscillating signal for the displacement of the wing.

    Then I use this data in MATLAB for signal processing. The force on the wing has a frequency of 20 Hz, but the frequency of the vibration ranges from 48 to 68 Hz. Why do I get a range for the vibration, when the force on the wing is oscillating at 20 Hz?

    Thanks guys!
  2. jcsd
  3. Sep 18, 2010 #2
    Twin boom?

    Forces do not have frequencies... Need input!
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