Wideband noise and vibration cancellation is one of the actual acoustical task. Low-frequency excitation cancellation is an intricate problem especially in wide frequency band. Due to the insufficient efficiency of passive absorbers at low frequencies, active methods and technical means are recommended for attenuation of disturbances. The active cancellation problem decision is illustrated in presentation with regard to the air duct in which wide frequency band excitation is propagated. The noise disturbance power attenuation averaged in the operating frequency band was 11–12 dB. The maximum spectral densities are suppressed at 16–17 dB.
72.70.+m Noise processes and phenomena
05.40.Ca Noise
$^1$Prokhorov General Physics Institute of the Russian Academy of Sciences\
$^2$Central design bureau for marine engineering “Rubin”\
$^3$N.N. Andreyev Acoustics Institute
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