Sound transmission loss of sandwich plate with pyramidal truss cores

Abstract

This paper presents the theoretical model of sandwich plate with pyramidal truss cores to investigate the acoustic property of transmission loss. The two-dimensional periodic model is established based on the assumption that the trusses are regarded as Euler-Bernoulli beams. The fluid-structure interaction is considered by imposing velocity continuity condition at fluid-structure interfaces. The periodic governing equations are derived by using space harmonic expansions and the principle of virtual work. Meanwhile, the practical specimens are fabricated by slitting and snap-fit assembly to conduct sound insulation experiment via standing wave tube method. The theoretical result shows satisfactory agreement with experimental data. The numerical discussions are conducted to demonstrate the effects of incident angles and topological parameters which should be helpful for practical design.

Comparative Study of Sound Transmission Losses of Sandwich Composite Double Panel Walls

“…Wang et al [65] conducted some experiments to validate their theoretical model on the STL of sandwich panels with pyramidal truss cores. The effects of truss stiffness, incident angles, elevation angles, face-sheet thickness and material properties on the STL of the pyramidal truss core were carefully studied.…”

“…In their results, the STL increased with increased Mach number along the downstream direction while it decreased along the upstream directions. In addition, the authors observed minimal shifts in the peaks and dips of the STL curves toward higher frequency during downstream event and toward lower frequency Wang et al [65] conducted some experiments to validate their theoretical model on the STL of sandwich panels with pyramidal truss cores. The effects of truss stiffness, incident angles, elevation angles, face-sheet thickness and material properties on the STL of the pyramidal truss core were carefully studied.…”

Sound transmission loss of sandwich panel with closed octahedral core

“…Sound transmission loss (STL) of panels is one of important acoustic issues for investigators in the past decades. The most appealing structures for sound transmission are sandwich structures made of multiple layer panels and cores [1–18]. Sandwich panels can be designed to have low density, high stiffness-to-mass ratio, excellent mechanical and acoustic characteristics, and hence have been widely applied as soundproof concepts.…”

“…Wang et al. [1] and Wangand Ma [4] established the periodic model of sandwich panel with pyramidal truss cores in two dimensions to calculate STL. Tang et al.…”

Fabrication and mechanical properties of three-dimensional enhanced lattice truss sandwich structures

“…Lightweight functional sandwich structures have been stimulated by the desire for superior and controllable mechanical properties that are expected and vital for actual applications [1–6]. To date, X-type metallic lattice truss cores prepared with stainless steels [7,8], octet lattice truss samples made from titanium alloys [9], tetrahedral cellular structures fabricated from carbon-fiber composites [10], and C/SiC pyramidal lattice truss sandwich panels [11], have been fabricated and investigated.…”