Reflected Wave Reduction Based on Time-Delay Separation for the Plane Array of Multilayer Acoustic Absorbers

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...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2021-12, Vol.21 (24), p.8432
Main Authors: Park, Hwijin, Won, Yeong Bae, Jeong, Sehyeong, Pyun, Joo Young, Park, Kwan Kyu, Lee, Jeong-Min, Seo, Hee-Seon, Yi, Hak
Format: Article
Language:English
Subjects:
Absorbers
acoustic absorber
Acoustic absorption
Acoustic attenuation
Acoustics
active noise control
Arrays
Communication
Delay
Experiments
Fluorides
LF noise
Multilayers
piezoelectric material
Piezoelectric transducers
Polyvinylidene fluorides
Sensors
Separation
Signal reflection
smart skin
Underwater acoustics
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Summary: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.
ISSN:1424-8220
1424-8220
DOI:10.3390/s21248432