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Old   March 14, 2007, 12:04
Default Aerodynamics Influence Coefficents, AIC
  #1
Bukhari
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Hi,

What are these Aerodynamic Influence Coefficents and how we can get these from Unsteady pressure distribution using FFT.

Thanks
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Old   March 20, 2007, 04:56
Default Re: Aerodynamics Influence Coefficents, AIC
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Paolo Lampitella
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Are you talking about something Aeroelastic or just Aerodynamic?
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Old   March 20, 2007, 06:15
Default Re: Aerodynamics Influence Coefficents, AIC
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Bukhari
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That's related to AeroElasticity
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Old   March 20, 2007, 12:08
Default Re: Aerodynamics Influence Coefficents, AIC
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Luca
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hi, have a look at www.aero.polimi.it/~cavagna under the publications section. Luca
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Old   March 21, 2007, 06:43
Default Re: Aerodynamics Influence Coefficents, AIC
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Paolo Lampitella
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I'm not able to go further because it's not my field. You should follow the Luca's link.
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Old   March 21, 2007, 07:14
Default Re: Aerodynamics Influence Coefficents, AIC
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Bukhari
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Hi,

Thanks a lot, I will be looking on these papers.
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Old   March 21, 2007, 07:16
Default Re: Aerodynamics Influence Coefficents, AIC
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Bukhari
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Thanks,

That might help!
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Old   March 21, 2007, 11:20
Default Re: Aerodynamics Influence Coefficents, AIC
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Peter Attar
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The classic definition of aerodynamic influence coefficients is that the the A_ij component of the coefficent matrix relates the velocity potential at a point "i" to the "downwash" w at a point j(normal velocity on the wing) ie:

phi_1=A_11*w_1+A_12*w_2+A_13*w_3+..... phi_2=A_21*w_1+A_22*w_2+...

etc

you can also think of them as relating the force at point f_i to the downwash at a point j ie

f_1=B_11*w_1+B_12*w_2+B_13*w_3+..... f_2=B_21*w_1+B_22*w_2+...

the A_ij(and B_ij) are functions of Mach number and reduced frfequency.

As far as determining them from unsteady pressure measurements you would need additional data such as surface velocities I believe. A search of the literature should come up with numerous methods for approximation these coefficients numerically.
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