# Aerodynamics Influence Coefficents, AIC

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 March 14, 2007, 12:04 Aerodynamics Influence Coefficents, AIC #1 Bukhari Guest   Posts: n/a Hi, What are these Aerodynamic Influence Coefficents and how we can get these from Unsteady pressure distribution using FFT. Thanks

 March 20, 2007, 04:56 Re: Aerodynamics Influence Coefficents, AIC #2 Paolo Lampitella Guest   Posts: n/a Are you talking about something Aeroelastic or just Aerodynamic?

 March 20, 2007, 06:15 Re: Aerodynamics Influence Coefficents, AIC #3 Bukhari Guest   Posts: n/a That's related to AeroElasticity

 March 20, 2007, 12:08 Re: Aerodynamics Influence Coefficents, AIC #4 Luca Guest   Posts: n/a hi, have a look at www.aero.polimi.it/~cavagna under the publications section. Luca

 March 21, 2007, 06:43 Re: Aerodynamics Influence Coefficents, AIC #5 Paolo Lampitella Guest   Posts: n/a I'm not able to go further because it's not my field. You should follow the Luca's link.

 March 21, 2007, 07:14 Re: Aerodynamics Influence Coefficents, AIC #6 Bukhari Guest   Posts: n/a Hi, Thanks a lot, I will be looking on these papers.

 March 21, 2007, 07:16 Re: Aerodynamics Influence Coefficents, AIC #7 Bukhari Guest   Posts: n/a Thanks, That might help!

 March 21, 2007, 11:20 Re: Aerodynamics Influence Coefficents, AIC #8 Peter Attar Guest   Posts: n/a 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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