Effect of perforation on the sound transmission through a double-walled cylindrical shell

Zhang, Qunlin; Mao, Yijun; Qi, Datong

doi:10.1016/j.jsv.2017.08.041

Cited by 24 publications

(5 citation statements)

References 18 publications

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“…In the mass-controlled region (i.e. beyond the ring frequency), on the other hand, the SMC controller is not expected to contribute to STL enhancement, as it does not add any mass to the structural system, and other approaches should be sought [4][5][6]8,9]. The most interesting observation is perhaps the superior performance of ERF-based SMC controller in elegant avoidance of the highly undesirable structural/acoustic resonance-based dips within the stiffness-controlled region (particularly near the ring frequency), nearly regardless of angle of incidence.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…M is the mass matrix, E t ð Þ (kV/mm) is the electric voltage, and the coefficient matrices ðM; F; D 1 ; D 2 , K 1 ; K 2 Þ will be defined in Appendix 2. Also, one can employ the transformation x t ð Þ ¼ ½q t ð Þ; _ q t ð Þ T to put the coupled system matrix dynamic equation (9) into the state-space form…”

Section: Fluid/structure Compatibility and Coupled System Equationsmentioning

confidence: 99%

“…In particular, the vibroacoustics of fluid-submerged cylindrical structures experiencing incident sound waves and/or wideband mechanical excitations is an imperative multi-physics (fluid/solid interaction) problem of fundamental interest that has been extensively investigated in the past few decades [1][2][3][4]. Reduction of sound transmission through (acoustic radiation from) such structures based only on the classical passive (viscoelastic/porous) sound insulation/absorption treatments (e.g., see [5][6][7][8][9]) is not eminently practical due to several reasons such as unfavorable increase in structural weight/volume, and deterioration of the vibration damping or sound absorbing material performance with environmental harshness and variations in frequency and temperature. Similarly, using secondary interior acoustic sources (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Active damping of sound transmission through an electrorheological fluid-actuated sandwich cylindrical shell

Hasheminejad

Cheraghi

Jamalpoor

2018

Jnl of Sandwich Structures & Materials

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An exact model is proposed for sound transmission through a sandwich cylindrical shell of infinite extent that includes a tunable electrorheological fluid core, and is obliquely insonified by a plane progressive acoustic wave. The basic formulation utilizes Hamilton’s variational principle, the classical and ﬁrst order shear deformation shell theories, the Kelvin–Voigt viscoelastic damping model (for the electrorheological fluid-core layer), and the wave equations for internal/external acoustic domains coupled by the proper fluid/structure compatibility relations. The Fourier–Bessel series expansions are used to arrange the governing (coupled) system equations in state-space form. The classical Sliding Mode Control law is then applied to semi-actively reduce sound transmission through the composite cylinder by smart variation of stiffness and damping characteristics of the electrorheological fluid-core actuator layer according to the control command. Numerical results present both the uncontrolled and controlled sound transmission loss spectra of the sandwich cylindrical shell at three angles of incidence for three distinct sets of material input parameters that represent the electric-field dependency of the complex shear modulus of the electrorheological fluid-core layer. The superior soundproof performance of electrorheological fluid-based sliding mode control system in avoiding the highly detrimental sound transmission loss dips occurring throughout the critical resonance and coincidence regions is demonstrated. Likewise, remarkable enhancements in the sound insulation characteristics of the electrorheological fluid-actuated structure utilizing the first or second electrorheological fluid material model are achieved within the stiffness-controlled region, especially at lower frequencies in near-grazing incidence situation. A number of limiting cases are introduced and validity of the formulation is confirmed by comparison with the available data.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Fluid/structure Compatibility and Coupled System Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Active damping of sound transmission through an electrorheological fluid-actuated sandwich cylindrical shell

Hasheminejad

Cheraghi

Jamalpoor

2018

Jnl of Sandwich Structures & Materials

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“…These applications include indoor sound field adjustment [2,3], muffler design [4,5], sound barriers [6,7], acoustic windows [8], and more. Zhang et al [9,10] suggest that when subjected to external plane waves or external turbulent boundary layer pressure excitation, the micro-perforation theory of the inner shell can theoretically enhance the mid-frequency sound insulation performance of double-walled cylindrical shells. However, in both of these cases, adding a lining in the annular space of the double-walled cylindrical shell does not improve the structural sound insulation performance.…”

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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“…Zhang et.al. [1] analyzed the effect of perforation on the sound transmission through a double-walled cylindrical shell. Then, Zhang et.al.…”

Section: Introductionmentioning

confidence: 99%

Influence of Frame Weld on Mechanic Performance of Double-walled Shell

et al. 2023

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Weld type between parts will make a difference on structural performance, which is especially important for a daouble-walled shell. To get clear this problem, numerical simulation is conducted to investigate the influence of weld plans between frame and out shell on structural stress and stability. Numerical results show that the change of weld plan between frame and out shell is small in case of a 15MPa external pressure, stress of shell is below the critical value, and the ultimate bearing capacity changes a little. Thus, the weld plan of point weld for frame and out shell could be applied while the double-walled shell is under construction.

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Effect of perforation on the sound transmission through a double-walled cylindrical shell

Cited by 24 publications

References 18 publications

Active damping of sound transmission through an electrorheological fluid-actuated sandwich cylindrical shell

Active damping of sound transmission through an electrorheological fluid-actuated sandwich cylindrical shell

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

Influence of Frame Weld on Mechanic Performance of Double-walled Shell

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