Finite Element Analysis on Acoustic and Mechanical Performance of Flexible Perforated Honeycomb‐Corrugation Hybrid Sandwich Panel

Abstract

Since proposed, the perforated honeycomb-corrugation sandwich panel has attracted a lot of attention due to its superior broadband sound absorption at low frequencies and excellent mechanical stiffness/strength. However, most existing studies have assumed a structure made of high-strength materials and studied its performance based on the ideal rigid-wall model with little consideration for acoustic-structure interaction, thereby neglecting the structural vibrations caused by the material’s elasticity. In this paper, we developed a more realistic model considering the solid structural dynamics using the finite element method (FEM) and by applying aluminum and rubber as the structural material. The enhancement of the low-frequency performance and inhibition of broadband absorption coexisted in low-strength rubbers, implying a compromise in the selection of Young's modulus to balance these two influences. Further analysis on thermal-viscous dissipation, mechanical energy, and average structural stress indicated that the structure should work right below the resonant frequency for optimization. Based on these findings, we designed a novel aluminum-rubber composite structure possessing enhanced low-frequency absorption, high resistance to shear load, normal compression, and thermal expansion. Our research is expected to shed some light on noise control and the design of multifunctional acoustic metamaterials.

Sustainable Perforated Acoustic Wooden Panels Designed Using Third-Degree-of-Freedom Bezier Curves with Broadband Sound Absorption Coefficients

“…To calculate the surface impedance on the 3D panel, we followed previous works [ 35 , 36 ] and used Equation (7): where p s is the surface pressure of the panel, u n is the normal velocity at the same point, u is the velocity vector at the given analysis point, n is the vector normal to the surface of the acoustic panel, and the symbol < > stands for the averaging operation. Following [ 35 , 36 ], the impedance was averaged across the panel’s whole surface, including the effects of both the perforated and non-perforated parts. For , a rectangular sample was used with a size of 3 × 3.5 m as it reflected the required conditions for the later ISO 354 [ 37 ] measurements.…”

“…To calculate the surface impedance on the 3D panel, we followed previous w [35,36] and used Equation ( 7):…”

“…The goal was to justify the perform with just 50 mm of backing material and an overall panel depth of 90 mm to invest whether it is possible to use this configuration to achieve satisfactory performance i low-frequency range, considered the most difficult in the current design. To calculate the surface impedance on the 3D panel, we followed previous works [35,36] and used Equation (7):…”

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

“…Intense vibration and noise provide a hostile environment for passengers and crew, possibly even destroying the inherent structural and fundamental properties of material at the expense of its service life. 1,2 One of the methods to reduce noise is to effectively utilize the acoustic properties of materials and structures. Honeycomb has been extensively applied in the aerospace and highspeed railroad industries for its remarkable stability and mechanical properties with lightweight.…”

“…A major challenge in the accelerated development of transportation infrastructure is noise suppression. Intense vibration and noise provide a hostile environment for passengers and crew, possibly even destroying the inherent structural and fundamental properties of material at the expense of its service life 1,2 . One of the methods to reduce noise is to effectively utilize the acoustic properties of materials and structures.…”