[Reports] / Amer.inst.of aeronautics and astronautics. N 90-4010 : Forcing level effect of internal acoustic excitation of the improvement of airfoil performance : Rep.presented at AIAA 13th aeroacoustics conf.,Oct.22-24, 1990, Tallahassee(Fl) / F.Hsiao,R.Shyu,R.Chang, 1990. - 8 p. - Текст : непосредственный.