Sound transmission through double cylindrical shells lined with porous material under turbulent boundary layer excitation

Zhou, Jie; Bhaskar, Atul; Zhang, Xin

doi:10.1016/j.jsv.2015.07.014

Cited by 56 publications

(30 citation statements)

References 48 publications

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“…4. It is shown that the change in the composition of the physical properties of the separating liquid and the material of the outer shell of the enclosing cylindri cal module determine the angle of deflection of sound waves emitted into the liquid in the form of a relation sin a = c V [10].…”

Section: Discussionmentioning

confidence: 99%

“…With the advent of new computer technologies, it has now become practical to simulate sound distribution using pressure, including phase information, in empty confined spaces [9]. Modeling possibilities are also considered, using methods of optics transformation for bending wave layers within elongated rod designs [10]. The transmission of sound through the double walls of a cylindrical shell with a lining of a vaporelastic material in the active zone is used, which excites pressure oscillations due to the external turbulent boundary layer [11].…”

Section: Research Of Existing Solutions Of the Problemmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of efficiency of deck diverce masking from distribution-diversion glaiders by a formable embody buffer zone

Карачун

Mel’nick

Fesenko

2017

TAPR

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Проведено аналіз одного з технічних рішень засобів ефективного маскування літаків тактичної палубної авіації корабельного базування. Розглянуто механізм досягнення невидимості літака штучним формуванням в рідині огороджувальної поверхні міжоболочного простору у вигляді зони каустики, конфокальної внутрішньої поверхні зовнішньої оболонки. Сформульовані умови ефективного досягнення необхідного ступеня скритності літака на палубі авіаносця. Ключові слова: кут аберації, ультразвукове випромінювання, резонанс хвильового збіги, зони каустики, огороджуюча поверхня.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Research Of Existing Solutions Of the Problemmentioning

confidence: 99%

Analysis of efficiency of deck diverce masking from distribution-diversion glaiders by a formable embody buffer zone

Карачун

Mel’nick

Fesenko

2017

TAPR

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“…Combining Eqs. (11), (12), (15), (17), and (20), the transmitted wave and reflected wave can be represented by the incident wave and the deflection of the plate,…”

Section: A Effective Parameters Of the Metamaterials Plate Via Effectmentioning

confidence: 99%

“…13 It was also demonstrated STL through an aeroelastic plate with orthogonal rib-stiffeners under external mean flow were improved significantly with the increase of Mach number over a wide frequency range. 14 As external mean flow was added on one side of a sandwich plate 9 or cylindrical shell 15 under different lined porous cores, higher STL was yielded when larger Mach number was applied.…”

mentioning

confidence: 99%

Sound transmission loss through metamaterial plate with lateral local resonators in the presence of external mean flow

Wang

Sheng

Qin

2017

The Journal of the Acoustical Society of America

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In the context of sound incident upon a metamaterial plate, explicit formulas for sound transmission loss (STL) are derived in the presence of external mean flow. Metamaterial plate, consisting of homogeneous plate and lateral local resonators (LLRs), is homogenized by using effective medium method to obtain the effective mass density and facilitate the calculation of STL. Results show that (a) vigorously oscillating LLRs lead to higher STL compared with bare plate, (b) increasing Mach number of the external mean flow helps obtain higher STL below the coincidence frequency but decreases STL above the coincidence frequency due to the added mass effect of light fluid loading and aerodynamic damping effect, (c) the coincidence frequency shifts to higher frequency range for the refracted effect of the external mean flow. However, effects of the flow on STL within negative mass density range can be neglected because of the lateral local resonance occurring. Moreover, hysteretic damping from metamaterial can only smooth the transmission curves by lowering higher peaks and filling dips. Effects of incident angles on STL are also examined. It is demonstrated that increasing elevation angle can improve the sound insulation, while the azimuth angle does not.

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“…In [18], sound transmission through double walls of a cylindrical shell with porous substrate material in the active zone, which is disturbed by pressure oscillations through external turbulent boundary layers, is investigated. The Bayot model is used to describe a sound wave propagating in a porous material.…”

Section: Research Of Existing Solutions Of the Problemmentioning

confidence: 99%

Reduction of technological risks of flight operation by artificial formation of the buffer zone to penetrating acoustic radiation

Карачун

Mel’nick

Fesenko

2017

TAPR

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Sound transmission through double cylindrical shells lined with porous material under turbulent boundary layer excitation

Cited by 56 publications

References 48 publications

Analysis of efficiency of deck diverce masking from distribution-diversion glaiders by a formable embody buffer zone

Analysis of efficiency of deck diverce masking from distribution-diversion glaiders by a formable embody buffer zone

Sound transmission loss through metamaterial plate with lateral local resonators in the presence of external mean flow

Reduction of technological risks of flight operation by artificial formation of the buffer zone to penetrating acoustic radiation

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