Abstract: The reduction of interior noise of propeller aircraft has been a main problem which is cared by acousticians.The methods for noise control which are generally adopted are absorp-tion,damping,insulation,etc. But the effects of reduction for low frequency noise are not sat-isfying because the properties of the material become worse at low frequency.Recently the technique of active sound control is considered to be an effective manner to controI the low fre-quency noise,especially the interior noise of propeller aircraft. Thismper first,theoretically,discusses the possibility for active control of sound radiation from an airplane panel,them intro-duces an adaptive active control system and last experimental results on active control of sound radiatio and sound transmission through panel are presented.The results are encouraging.

Key words: aircraft compartments, acoustic propagation noise prediction (aircraft)noise re-duction