The study of sound transmission through sandwich cylindrical shells with circumferentially corrugated cores filled with porous materials

Shahsavari, Hesamoddin; Kornokar, Mohammad; Talebitooti, Roohollah; Daneshjou, K.

doi:10.1016/j.compstruct.2022.115608

Cited by 13 publications

(4 citation statements)

References 43 publications

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“…Sun et al 10 filled honeycomb with isocyanate‐based polyimide foam, which increased the average absorption coefficient from 0.1 to 0.78 in the 100–6300 Hz region. In addition, Shahsavari et al 11 used porous material to fill a laminated cylindrical enclosure with a corrugated core. It was found that porous material improved the overall sound insulation capacity of structure in the broadband frequency range, and glass wool showed better sound absorption properties than other materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation and sound insulation of honeycomb composite structures filled with glass fiber

Ge,

Xue,

Liu

et al. 2023

Polymer Composites

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Honeycomb composite with excellent mechanical–physical properties had attracted extensive attention. To achieve outstanding sound insulation while maximizing the high‐performance of honeycomb composite, this article reported a honeycomb composite structure filled with glass fiber (HFG) based on a paper‐making process and the corresponding sandwich structure. Pulping parameters, mechanical property, air permeability and sound insulation of HFG were analyzed. The results showed that the hanging index and settling height of glass fiber slurry were inversely proportional to the beating degree, which was beneficial for reducing the coefficient of variation (CV) of HFG with value of 4%–6%. The maximum improvement in tensile strength and bursting strength of HFG were 70% and 53%, respectively. In addition, sound transmission loss (STL) of HFG was proportional to cell size, density, filling amount and thickness of the honeycomb. Compared to HFG, sandwich structure consisting of HFG and glass fiber/hot melt fiber panels effectively improved STL, especially at low‐mid frequencies. It was also found that designing holes on the surface of sandwich structure could further improve STL in certain frequency bands. The structure offered a lightweight and high‐performance response for construction, transportation and infrastructure.Highlights This article designs a new type of honeycomb filled glass fiber via paper‐making process, aiming to improve the comprehensive performance of honeycomb. By the design of embedded structure, the maximum improvement in tensile strength and bursting strength of honeycomb were 70% and 53%, respectively. By designing perforated, embedded and laminated structures, sound insulation has been improved, while reducing material quality.

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Section: Introductionmentioning

confidence: 99%

Preparation and sound insulation of honeycomb composite structures filled with glass fiber

Ge,

Xue,

Liu

et al. 2023

Polymer Composites

View full text Add to dashboard Cite

show abstract

“…The flow around these vehicles is turbulent, but to simplify the solution process, the previous studies have not considered this flow (Amirinezhad et al, 2020; Bolton and Shiau, 1996; Daneshjou and Talebitooti, 2016; 2017; Kornokar and Shahsavari, 2022; Lee and Kim, 2001; Y. Liu, 2015; Talebitooti and Choudari Khameneh, 2019; Tarkashvand and Bolhassani, 2023; Xin and Lu, 2010) or assumed that as external mean flow (Meng et al, 2012; Reaei and Tarkashvand, 2020; Shahsavari and Talebitooti, 2021; 2022; Tarkashvand et al, 2021; 2022; Xin and Lu, 2009; Xin and Lu, 2013a, 2013b; Zhou and Bhaskar, 2013). The resulting noise from TBL excitation is a sufficiently reliable prediction of what is happening in reality.…”

Section: Introductionmentioning

confidence: 99%

Investigation of sound transmission through a finite length cylindrical shell in the presence of an exterior turbulent boundary layer

Daneshjou,

Kornokar,

Saebi

2023

Journal of Vibration and Control

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This paper studies sound transmission through a thin cylindrical shell of finite length. The structure is subjected to an exterior turbulent boundary layer (TBL) excitation and the boundary conditions of its two ends are considered as simply-supported. The classical shell theory (CST) is employed to derive wave propagation in the cylindrical shell, and the Corcos model is applied to describe pressure fluctuation due to TBL. According to the existence of two axial and radial modes, a complete convergence study is presented. To examine sound transmission through the structure, a comprehensive parameters study is provided on the resulting power spectral density (PSD) of the kinetic energy. To validate the results of the present method, the statistical energy analysis (SEA) method is used. For this purpose, modeling is performed by SEA in VA One software, which shows the high accuracy of the results of the present method. The analytical predictions suggest that the sound insulation performance of such a finite length structure is enhanced considerably by increasing the thickness of the shell in a broad-band frequency range. Similar effects on sound transmission are observed for Young’s modulus and density of the shell particularly in the low and high-frequency ranges, respectively. Whereas, enhancing the turbulent pressure and freestream velocity adversely affects sound radiation into the structure.

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“…However, this study yielded less favorable results at low frequencies. Hesamoddin et al [17] used the extended boundary element method to establish an analytical model for analyzing the vibroacoustic performance of corrugated-core sandwich cylindrical shells filled with porous materials. The influence of various parameters was investigated, including porosity, porous material type, corrugated core thickness, structural damping coefficient, angle of incidence, and external Mach number.…”

Section: Introductionmentioning

confidence: 99%

Study on the Vibration and Sound Radiation Performance of Micro-Perforated Laminated Cylindrical Shells

Li,

Wang,

Zheng

et al. 2023

Applied Sciences

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In response to the problem of vibration and noise reduction in equipment with cylindrical shell structures, this paper focuses on the micro-perforated laminated cylindrical shell structure and establishes its finite element model. Through comparative analysis with experimental results, the reliability of the finite element modeling method is verified. Based on this, the paper places particular emphasis on the vibration and acoustic radiation performance of the structure in the 1–1000 Hz frequency range under free conditions to understand the impact of different laminated shell structures, micro-perforation parameters (porosity, aperture), sound-absorbing foam materials, and placement methods. The results indicate that micro-perforated structures can efficiently reduce the structural radiated sound power level at specific frequencies, but the overall reduction in radiated sound power level is not significant. Various types of foam are effective in reducing the structural radiation acoustic power level, with polyurethane performing best among them. Changing the location of foam placement has a relatively insignificant impact on the structural radiation acoustic power level.

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The study of sound transmission through sandwich cylindrical shells with circumferentially corrugated cores filled with porous materials

Cited by 13 publications

References 43 publications

Preparation and sound insulation of honeycomb composite structures filled with glass fiber

Preparation and sound insulation of honeycomb composite structures filled with glass fiber

Investigation of sound transmission through a finite length cylindrical shell in the presence of an exterior turbulent boundary layer

Study on the Vibration and Sound Radiation Performance of Micro-Perforated Laminated Cylindrical Shells

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