Understanding Vibration of an Airplane Wing in a Wind Tunnel

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SUMMARY

The discussion centers on the vibration characteristics of an airplane wing model in a wind tunnel, specifically addressing the discrepancy between the applied oscillatory force frequency of 20 Hz and the observed vibration frequency range of 48 to 68 Hz. The wing is supported at the quarter-chord length, allowing for free movement. MATLAB is utilized for signal processing to analyze the displacement data. The participants highlight the importance of understanding the dynamics of the system, as forces themselves do not possess frequencies.

PREREQUISITES
  • Understanding of aerodynamic principles related to airfoil behavior
  • Familiarity with wind tunnel testing methodologies
  • Proficiency in MATLAB for signal processing and data analysis
  • Knowledge of dynamic systems and vibration analysis
NEXT STEPS
  • Explore the principles of structural dynamics in relation to oscillatory forces
  • Investigate the effects of boundary conditions on vibration frequencies
  • Learn advanced MATLAB techniques for analyzing time-domain signals
  • Study the relationship between forcing frequencies and natural frequencies in mechanical systems
USEFUL FOR

Aerospace engineers, mechanical engineers, researchers in fluid dynamics, and anyone involved in experimental aerodynamics and vibration analysis will benefit from this discussion.

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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