Review on Multi-scale Structural Design of Submarine Stealth Composite

Qian, Chao; Li, Yongqing

doi:10.12783/dtetr/icaenm2017/7834

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…After a literature investigation, we find that current research still has some shortcomings:Although the local-structure design based on traditional acoustic theory is clear, its preparation is difficult, or the parameters of the prepared materials are contradictory to the setting parameters, which make it hard to achieve the expected performance [10]. Some theoretical studies are limited in terms of preparation techniques, and they lack experimental verification.…”

Section: Discussionmentioning

confidence: 99%

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From Local Structure to Overall Performance: An Overview on the Design of an Acoustic Coating

et al. 2019

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Based on the requirements of underwater acoustic stealth, the classification and research background of acoustic coatings are introduced herein. The research significance of acoustic coatings is expounded from the perspective of both the military and civilian use. A brief overview of the conventional design process of acoustic coatings is presented, which describes the substrates used in different countries. Aimed at the local design of acoustic coatings, research progress on passive and semi-active/active sound absorption structure is summarized. Focused on the passive acoustic coatings; acoustic cavity design and optimization, acoustic performance of acoustic coatings with rigid inclusions or scatterers, and acoustic coatings with a hybrid structure are discussed. Moreover, an overview of the overall design of acoustic coatings based on the sound field characteristics of the submarine is also presented. Finally, the shortcomings of the research are discussed, breakthroughs in acoustic coating design research are forecast, and the key technical issues to be solved are highlighted.

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Section: Discussionmentioning

confidence: 99%

“…Although the local-structure design based on traditional acoustic theory is clear, its preparation is difficult, or the parameters of the prepared materials are contradictory to the setting parameters, which make it hard to achieve the expected performance [10].…”

Section: Discussionmentioning

confidence: 99%

From Local Structure to Overall Performance: An Overview on the Design of an Acoustic Coating

et al. 2019

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“…Such an elastomeric cladding material with porosities and cavities on the hull of submarine brought about it hard to be intercepted by sonar systems. Such an engineered rubber layers and coatings have paved the way for lower detection ranges of sonars by absorbing acoustical waves [5,6,8,9]. Combining geometrical form, configuration and variety of shapes of elastomeric layers along with manipulating acoustical impedance result in reduced sonar signals by absorbtion of sound waves [10].…”

Section: Introductionmentioning

confidence: 99%

“…Materials with highly porous shape and form and adjustment of acoustical impedance implement considerably lower sonar signals via absorption of sound waves [8,9,10,18]. The effects of porousity to underwater sound absorbtion is widely reviewed in theoretical elsewhere [4,19].…”

Section: Introductionmentioning

confidence: 99%

Underwater acoustic performance of SiC foam ceramic materials

et al. 2023

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One of the major tasks of the underwater warfare is to detect underwater objects such as vehicles, vessels, weapons and equipment. The conduct of underwater warfare mostly depends upon the advancement of detection and identification sensors and materials. The wide variation in types and characteristics of materials may affect the underwater detection capabilities despite recently developed sonar systems. The materials with high porosity are known to provide lower acoustical signature than conventional metallic plates in common. The aim of this study is to examine the acoustical signature and the efficiency of open celled SiC foam ceramics as covering and/or casing material for naval mines. Sonar frequencies widely used in mine countermeasure operations for detection purposes, 80 kHz, 85 kHz, 90khZ, 95 kHz and 100 kHz were applied to the acoustic tests. The experimental results obtained from the study shows that the SiC foam ceramic plate leads a 19,2% reduction in reflection, 90,5% and 96% lower values are obtained in transmission and 78,4% and 68,6% lower values are obtained at 60° and 30° in scattering compared to the reference steel plate. Article Highlights This study investigates underwater acoustic performance of open celled SiC foam ceramics the range of 80–100 kHz in the acoustic test pool environment for the very first time. Highly tortuose and porous structure of open celled SiC foam ceramic leads a considerable decrease in scattering, reflection and transmission properties. The study reveals that SiC foams ceramics are potential candidates in reducing acoustical signature as covering and/or casing material for future naval mine applications.

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Design of acoustic coating for underwater stealth in low-frequency ranges

Ranjbar,

Bayer

2024

J Braz. Soc. Mech. Sci. Eng.

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In this study, it is aimed to protect underwater vehicles against active sonar systems by anechoic coating. A matrix material with close acoustic impedance to water, resistivity to hydrostatic pressure, suitability for the marine environment, and high material loss factor is selected. At low frequencies, the inclusions in different shapes and sizes are added to the matrix material. Since solid inclusions will increase the coating mass considerably, air cavities are preferred as inclusions. More attention is paid to low-frequency absorption, especially below 1 kHz, because of advancing sonar technology. The acoustic performance of the designed models is compared in three frequency ranges: low (below 3 kHz), middle (3–6 kHz), and high (6–10 kHz). The designed models are constructed by considering hydrostatic pressure; hence, volume of air cavities is tried to decrease, while absorption performance is aimed to increase. Therefore, a conical cavity which commonly used in the literature is optimized by chancing its dimensions and location. Also, novel approaches, gong shape cavity, and sandglass cavities are introduced. The results show that, not only cavity shape, but also its location and dimensions are highly influential on absorption performance. High-volume cavities increase the absorption performance at the low-frequency range, but they are not effective at high frequencies. The gong shape and sandglass air cavities show broadband absorption; also, gong shape cavity volume is less than literature models. Thus, its usability increases at deep waters. The results of this study provide novel underwater acoustic coating models for various applications.

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Review on Multi-scale Structural Design of Submarine Stealth Composite

Cited by 7 publications

References 21 publications

From Local Structure to Overall Performance: An Overview on the Design of an Acoustic Coating

From Local Structure to Overall Performance: An Overview on the Design of an Acoustic Coating

Underwater acoustic performance of SiC foam ceramic materials

Design of acoustic coating for underwater stealth in low-frequency ranges

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