Analytical Study on the Rate of Sound Transmission Loss in Single Row Honeycomb Sandwich Panel Using a Numerical Method

Honeycomb structures have recently, replaced with conventional homogeneous materials. Given the fact that sandwich panels containing a honeycombcore are able to adjust geometric parameters, including internal angles, they aresuitable for acoustic control applications. The main objective of this study wasto obtain a transmission loss curve in a specific honeycomb frequency range alongwith same overall dimensions and weight. In this study, a finite element model(FEM) in ABAQUS software was used to simulate honeycomb panels, evaluateresonant frequencies, and for acoustic analysis. This model was used to obtainacoustic pressure and then to calculate the sound transmission loss (STL) inMATLAB software. Vibration and acoustic analysis of panels were performedin the frequency range of 1 to 1000 Hz. The models analyzed in this designincludes 14-single row-honeycomb designs with angles of −45°, −30°, −15°,0°, +15°, +30°, +45°. The results showed that a-single row and −45°cell anglehoneycomb panel in the frequency range of 1 to 1000 Hz had the highest STLas well as the highest number of frequency modes (90 mods). Furthermore, thepanel had the highest STL regarding the area under the STL curve (dB∙Hz).The panels containing more frequency mods, have a higher transmission loss.Moreover, the sound transmission loss is more sensitive to the cell angle variable(θ). In other studies, the STL was more sensitive to the number of honeycombcells in the horizontal and vertical directions, as well as the angle of cells.