An Active Control Method of Reflected Sound Wave In Underwater Acoustic Tube

Abstract

Passive sound absorbing materials have limited the properties of sound absorption for low frequency sound waves. Therefore, an active control method proposed to eliminate the low-frequency reflected echo. But the passive sound absorption material, sensor and control source of piezoelectric material are completely separately in the traditional active control method. It is not suitable for engineering application, although it has some control effect. In this paper, an active control method based on integrated hydrophone proposed, which integrates all the devices together and combines with FLMS filter algorithm to control the reflected acoustic wave. Besides, the experimental study on active control of the reflected sound waves in the underwater acoustic tube is finished, the active control experiment of reflected acoustic wave carried out for single frequency signal in underwater acoustic tube, and the effect of active control of reflected acoustic wave is over 6 dB.