Understanding Vibration of an Airplane Wing in a Wind Tunnel

AI Thread Summary
The discussion centers on a wind tunnel experiment involving an airplane wing model subjected to a 20 Hz oscillatory force. Despite the applied force frequency, the observed vibration frequency of the wing ranges from 48 to 68 Hz. Participants question why this discrepancy occurs, noting that forces themselves do not possess frequencies. The conversation seeks clarification on the relationship between the applied force and the resulting vibrations in the wing model. Understanding this phenomenon is crucial for accurate modeling and analysis in aerodynamics.
wizkidder
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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!
 
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wizkidder said:
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.

Twin boom?

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!

Forces do not have frequencies... Need input!
 

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