Abstract
With the extension of the applications of sandwich panels with corrugated core, sound insulation performance has been a great concern for acoustic comfort design in many industrial fields. This paper presents a numerical and experimental study on the vibro-acoustic optimization of a finite size sandwich panel with corrugated core for maximizing the sound transmission loss. The numerical model is established by using the wave-based method, which shows a great improvement in the computational efficiency comparing to the finite element method. Constrained by the fundamental frequency and total mass, the optimization is performed by using a genetic algorithm in three different frequency bands. According to the optimization results, the frequency averaged sound transmission of the optimized models in the low, middle, and high-frequency ranges has increased, respectively, by 7.6 dB, 7.9 dB, and 11.7 dB compared to the baseline model. Benefiting from the vast number of the evolution samples, the correlation between the structural design parameters and the sound transmission characteristics is analyzed by introducing the coefficient of determination, which gives the variation of the importance of each design parameter in different frequency ranges. Finally, for validation purposes, a sound insulation test is conducted to validate the optimization results in the high-frequency range, which proves the feasibility of the optimization method in the practical engineering design of the sandwich panel.
Highlights
Because of its high stiffness to mass ratio and excellent impact resistance property, lightweight sandwich panels are largely used in civil construction, high-speed vehicle, ship structure, and aerospace industries [1,2]
The sound insulation performance of the sandwich structure mainly depends on the overall stiffness of the structure, which can be significantly influenced by geometrical configuration
Paper, considering considering the afinite finitesize sizesandwich sandwichplate platewith with corrugated corrugated core core is is established established by by using using the thewave-based wave-based method
Summary
Because of its high stiffness to mass ratio and excellent impact resistance property, lightweight sandwich panels are largely used in civil construction, high-speed vehicle, ship structure, and aerospace industries [1,2]. As for the elastic structure linked sandwich plates, Brunskog [6] presented a deterministic prediction model for airborne sound insulation performances of an infinite double leaf structure In his study, both the structural and acoustical (acoustic cavities) sound transmission paths are considered. Due to the complexity of the vibro-acoustical coupling system, most of the aforementioned theoretical models can only handle the sandwich plates whose core structures are relatively simple (e.g., periodic orthogonality stiffeners). Studied the vibration and sound radiation properties of the sandwich structure with a honeycomb truss core with the spectral finite element method, and the sound transmission reduction indexes of sandwich beams with different core configurations were evaluated and compared. In association with the genetic algorithm (GA) and with the advantage of the high computational efficiency of WBM, a vibro-acoustic optimization is performed to maximize the sound transmission loss of the sandwich structure. A confirmatory sound insulation test on a real sandwich panel specimen is conducted to verify the optimization configuration
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