Influence of hole shape on sound absorption of underwater anechoic layers

Ye, Changzheng; Liu, Xuewei; Xin, Fengxian; Lu, Tian Jian

doi:10.1016/j.jsv.2018.04.008

Cited by 82 publications

(46 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this paper, the properties of the acoustic vector field near the underwater planar cavity baffle are analyzed. The baffle used in the flank array is long enough to be simplified to an infinite planar multilayer structure, so the acoustic vector field near the planar cavity baffle can be obtained based on the transfer matrices and matched boundary conditions [22][23][24][25]. The properties of pressure, particle velocity vector, and complex intensity are analyzed in detail.…”

Section: Introductionmentioning

confidence: 99%

Properties of the Acoustic Vector Field near the Underwater Planar Cavity Baffle and Its Application

Chen

Zhu

Yang

2022

JMSE

View full text Add to dashboard Cite

In order to apply the acoustic vector hydrophone on a ship, the properties of the acoustic vector field near the underwater planar cavity baffle are studied based on the Euler description and Lagrange description. The acoustic vector field is calculated based on the transfer matrices and matched boundary conditions. It is shown that the interference structure appears in the acoustic field. In particular, the particle velocity direction and intensity vector cannot directly reflect the azimuth of the source. The points at which the particle velocity is zero are saddle points and nodal points in the particle velocity vector field. Moreover, the particle motion is generally an ellipse near the planar cavity baffle. Furthermore, this paper defines a parameter that can fully represent the particle motion, and the direction of arrival (DOA) can be estimated using a single acoustic vector hydrophone using this parameter in some cases. At the end, the validity of the theoretical calculation and the method of using the parameter to estimate the DOA are verified experimentally.

show abstract

Section: Introductionmentioning

confidence: 99%

Properties of the Acoustic Vector Field near the Underwater Planar Cavity Baffle and Its Application

Chen

Zhu

Yang

2022

JMSE

View full text Add to dashboard Cite

show abstract

“…Over recent decades, sound absorption layers attached to ships have been gradually utilized to reduce the transmission of underwater sound, which could availably increase the sound wave absorption and thus isolate the noise inside ships as well as suppress the ship vibration [ 11 , 12 , 13 , 14 ]. Currently, damping materials are most commonly utilized as sound absorption layers to reduce vibration and sound noise, which include viscoelastic materials, composites, metal, and intelligent damping materials [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Solution for Dynamic Mechanical Parameter Influence on Underwater Sound Absorption of Polyurethane-Based Composite

Yin

Liu

Wang

et al. 2022

IJMS

View full text Add to dashboard Cite

Underwater noise pollution, mainly emitted by shipping and ocean infrastructure development of human activities, has produced severe environmental impacts on marine species and seabed habitats. In recent years, a polyurethane-based (PU-based) composite with excellent damping performance has been increasingly utilized as underwater sound absorption material by attaching it to equipment surfaces. As one of the key parameters of damping materials, dynamic mechanical parameters are of vital importance to evaluating the viscoelastic damping property and thus influencing the sound absorption performance. Nevertheless, lots of researchers have not checked thoroughly the relationship and the mechanism of the material dynamic mechanical parameters and its sound absorption performance. In this work, a finite element model was fabricated and verified effectively using acoustic pulse tube tests to investigate the aforementioned issues. The influence of the dynamic mechanical parameters on underwater sound absorption performance was systematically studied with the frequency domain to reveal the mechanism and the relationship between damping properties and the sound absorption of the PU-based composite. The results indicate that the internal friction of the molecular segments and the structure stiffness were the two main contributors of the PU-based composite’s consumption of sound energy, and the sound absorption peak and the sound absorption coefficient could be clearly changed by adjusting the dynamic mechanical parameters of the composite. This study will provide helpful guidance to develop the fabrication and engineering applications of the PU-based composite with outstanding underwater sound absorption performance.

show abstract

“…The anechoic layer exhibits excellent sound absorption properties; however, it works well only in a specific frequency band, depending on the pore shape. In addition, to increase the sound absorption bandwidth using anechoic coatings, different pore sizes must be designed [ 11 , 12 , 13 ]. In a study based on a viscoelastic material, a certain method was adopted to increase the sound absorption performance according to the material of the inner core and angle of the ellipsoidal.…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of an Active Reflection Controller That Can Reduce Acoustic Signal Refer to the Angle of Incidence

Pyun

Park

Kim

et al. 2021

Sensors

View full text Add to dashboard Cite

Techniques for reducing the reflection of acoustic signals have recently been actively studied. Most methods for reducing acoustic signals were studied using the normal-incidence wave reduction technique. Although the technique of canceling an object from the normal incidence wave is essential, research on reducing acoustic signals according to the angle of incidence is required for practical applications. In this study, we designed, fabricated, and experimented with an active reflection controller that can reduce acoustic signals according to the angle of incidence. The controller consists of a transmitter on one layer, a receiver sensor on two layers, and an acoustic window on three layers. To reduce the reflected signal, a combination of the time delay and phase was applied to the controller to minimize the acoustic signal by up to −23 dB at an angle of 10°. A controller array simulation was performed based on the results of a controlled experiment. In conclusion, our proposed controller can reduce acoustic signals according to the angle of incidence, which makes it suitable for many applications.

show abstract

Influence of hole shape on sound absorption of underwater anechoic layers

Cited by 82 publications

References 35 publications

Properties of the Acoustic Vector Field near the Underwater Planar Cavity Baffle and Its Application

Properties of the Acoustic Vector Field near the Underwater Planar Cavity Baffle and Its Application

Finite Element Solution for Dynamic Mechanical Parameter Influence on Underwater Sound Absorption of Polyurethane-Based Composite

Design and Analysis of an Active Reflection Controller That Can Reduce Acoustic Signal Refer to the Angle of Incidence

Contact Info

Product

Resources

About