Abstract

This paper presents a control technique for reducing the reflection of acoustic signals for the plane array of multilayer acoustic absorbers underwater. In order to achieve this, a plane array of multilayer acoustic absorbers is proposed to attenuate low-frequency noise, with each unit consisting of a piezoelectric transducer, two layers of polyvinylidene fluorides and three layers of the acoustic window. Time-delay separation is used to find the incident and reflected acoustic signals to achieve reflected sound reduction. Experimental comparison of the attenuation rate of the reflected acoustic signal when performing passive and active controls is considered to verify the effectiveness of the time-delay separation technique applied plane array absorbers. Experiments on the plane array of smart skin absorbers confirmed that the reduction of reflected acoustic signals makes it suitable for a wide range of underwater applications.

Highlights

  • A passive acoustic absorber has traditionally been used as a method of acoustic absorption underwater

  • An experiment with reflected wave reduction control was conducted to evaluate the performance of a plane array with multilayer acoustic absorbers

  • The application of the active control to the plane array with multilayer is allowed for a digital controller to generate a control signal with the same magnitude as the opposite phase, whereas the passive control scheme is entirely dependent on the natural material’s sound-absorbing properties and has no control over them

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Summary

Introduction

Active noise control (ANC), a combination of smart material and an active digital controller, was researched

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