On the active control of spectral lines of ship radiated noise

By properly setting up a secondary sound source on ship´s shell, it is theoretically feasible to suppress ship radiated noise in a local region. Since low frequency line spectrum of ship radiated noise contains significant signature information, its active control has always been an important research task. Due to sound interference, to actively control various spectral lines, the phase compensation of corresponding secondary sound signal varies according to different frequencies of spectral lines. Based on a normalized LMS algorithm, this paper proposes an approach utilizing multi-channel noise cancellation system to actively control multiple line spectrum signals of ship radiated noise. Simulation results demonstrated the effectiveness of the approach.