Vibro-acoustic analysis of micro-perforated sandwich structure used in space craft industry

Omrani, Abderrazak; Tawfiq, Imad

doi:10.1016/j.ymssp.2010.07.010

Cited by 10 publications

(4 citation statements)

References 12 publications

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“…Sound radiation of vibrating sandwich plates has been studied in recent years. Omrani and Tawfiq [6] have carried out a vibro-acoustic analysis of a micro-perforated sandwich structure and developed a numerical local impedance model to describe the influence induced by the perforation through software. Assaf et al [7] have given a finite element formulation, which takes the effects of fluid loading into consideration, to conduct the vibro-acoustic analysis of damped sandwich plates.…”

Section: Introductionmentioning

confidence: 99%

Vibration and Acoustic Response of Rectangular Sandwich Plate under Thermal Environment

Liu

2013

Shock and Vibration

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In this paper, we focus on the vibration and acoustic response of a rectangular sandwich plate which is subjected to a concentrated harmonic force under thermal environment. The critical buckling temperature is obtained to decide the thermal load. The natural frequencies and modes as well as dynamic responses are acquired by using the analytical formulations based on equivalent non-classical theory, in which the effects of shear deformation and rotational inertia are taken into account. The rise of thermal load decreases the natural frequencies and moves response peaks to the low-frequency range. The specific features of sandwich plates with different formations are discussed subsequently. As the thickness ratio of facing to core increases, the natural frequencies are enlarged, and the response peaks float to the high-frequency region. Raising the Young's modulus of the core can cause the similar trends. The accuracy of the theoretical method is verified by comparing its results with those computed by the FEM/BEM.

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Section: Introductionmentioning

confidence: 99%

Vibration and Acoustic Response of Rectangular Sandwich Plate under Thermal Environment

Liu

2013

Shock and Vibration

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“…Figure 1 shows a single-layer HMPP structure. e structure is composed of MPP on the upper surface, a honeycomb core in the middle, and a bottom panel below [24]. e improved cellular structure of the honeycomb core is proposed to obtain better and adjustable sound absorption performance in this work.…”

Section: Structural Acoustic Impedancementioning

confidence: 99%

Design of Honeycomb Microperforated Structure with Adjustable Sound Absorption Performance

Yan

Chen

et al. 2021

Shock and Vibration

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In this work, a double-layer honeycomb microperforated structure with adjustable back-cavity’s height is designed based on cylinder honeycomb structure and microperforated panel (MPP). The sound absorption performance can be changed by adjusting the height of back-cavity. Thus, a better absorption performance is achieved by changing the position of the inner MPP. Acoustic impedance of the structure was calculated based on transfer matrix method. The sound absorption coefficient of the structure was obtained by finite element method (FEM). Meanwhile, the 3D printing technology was used to produce the experimental samples. The experimental results demonstrate that the sound absorption coefficient of the structure is greater than 0.8 in the range of 750–1250 Hz, greater than 0.9 in the range of 2297–3592 Hz, and above 0.5 in the range of 500–4000 Hz. In addition, the feasibility of achieving adjustable sound absorption by means of changing the height of the back-cavity is verified by theoretical, simulation, and experimental results. The structure proposed in this work can realize the function of wide-band and better sound absorption performance by changing the position of the inner MPP, which can be applied to effectively reduce different frequencies noise.

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“…The last two terms in equation ( 1) denote end corrections, for the sound radiates at both ends of the perforation and part of the air moves along the MPP panel when it flows in and out of the perforation [25,26]. For the air cavity behind the perforations of each MPP, the acoustic impedance is…”

Section: Theoretical Modelmentioning

confidence: 99%

Ultralight micro-perforated sandwich panel with hierarchical honeycomb core for sound absorption

Peng

Xin

et al. 2021

Jnl of Sandwich Structures & Materials

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A theoretical model is developed to study the superior sound absorption performance of ultralight mirco-perforated sandwich panels with double-layer hierarchical honeycomb core. Numerical simulations are performed to validate theoretical model predictions and explore physical mechanisms underlying the sound absorption. Systematic parametric study is implemented to investigate the influence of specific structural parameters on sound absorption. To maximize sound absorption, optimal structural parameters of the hierarchical sandwich are obtained using the method of simulated annealing. It is demonstrated that viscous dissipation of the air inside micro-perforations and around inlet/outlet regions dominates sound absorption. Compared to micro-perforated sandwich panels with regular honeycomb core, not only the proposed hierarchical construction has much improved load-bearing capacity, but also significantly enhanced sound absorption covers a wide range of frequency.

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Vibro-acoustic analysis of micro-perforated sandwich structure used in space craft industry

Cited by 10 publications

References 12 publications

Vibration and Acoustic Response of Rectangular Sandwich Plate under Thermal Environment

Vibration and Acoustic Response of Rectangular Sandwich Plate under Thermal Environment

Design of Honeycomb Microperforated Structure with Adjustable Sound Absorption Performance

Ultralight micro-perforated sandwich panel with hierarchical honeycomb core for sound absorption

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