A simple aeroacoustic model have been used in this paper for describing the dynamic behaviour of the waves near a subsonic airfoil. The decoupled controllability problem has been discussed. Several rules have been pointed out. They aim at a better efficiency of the strategy. An important aspect of the method suggested is that piezo-devices are used. Basing upon the very good experimental results obtained by J. Wojciechowski, T Szuster and J. Pietrucha [1998], who used a harmonic function for the voltage of the piezo-device, the present analysis gives a few rules which should enable one to improve the efficiency of the method.
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