The effects of voids and recesses on the transmission loss of honeycomb sandwich panels

Palumbo, Daniel L.; Klos, Jacob

doi:10.3397/1.3633954

Cited by 8 publications

(4 citation statements)

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“…The results show that the recessed core presents a transmission loss improvement of 3−11 dB compared to the baseline honeycomb panel over a wide frequency range, but it is traded for a 5% increase in mass and reduction of the load-bearing capability. Palumbo and Klos [83,84] extend the work presented in ref [81], remarking that this kind of panels radiate noise efficiently because the vibrational energy is concentrated around the sonic wave number. The voided honeycomb panels enhance greatly the transmission loss above 400 Hz, especially if the voids are fiberglass filled, but this is traded for load-bearing capability.…”

Section: Experimental Workmentioning

confidence: 80%

A review of the vibroacoustics of sandwich panels: Models and experiments

d’Alessandro

Petrone

Rosa

2013

Jnl of Sandwich Structures & Materials

108

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This paper reviews the most significant works in literature about the acoustic behaviour of sandwich panels, starting from the first examples of multi-layered structures, comprising a series of different layers enclosing an air-gap, to the actual configurations in which the opportunities of emerging manufacturing technologies are considered in the design stages. The focus is on presenting an exhaustive list of dedicated and validated models, which are able to predict the sound transmission through sandwich panels according to their specific configuration. Some experimental works, aimed to the model correlations, are reviewed, too.

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Section: Experimental Workmentioning

confidence: 80%

A review of the vibroacoustics of sandwich panels: Models and experiments

d’Alessandro

Petrone

Rosa

2013

Jnl of Sandwich Structures & Materials

108

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“…Palumbo et al. [319] investigated the influences of voids and recesses on the acoustic behavior of HSPs. It was presented that it was possible to significantly enhance the STL by keeping the strength and mass of the panel.…”

Section: Vibroacoustic Solutionmentioning

confidence: 99%

Prediction of acoustic wave transmission features of the multilayered plate constructions: A review

Zarastvand

Ghassabi

Talebitooti

2021

Jnl of Sandwich Structures & Materials

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This study collects all of the existent papers in the field of acoustic transmission across multilayered plate constructions. Herewith, a comprehensive source is proposed wherein approximately 410 references are reviewed and described from the first [Formula: see text] to [Formula: see text]. In the first part, in addition to the presentation of a complete explanation about the importance of the acoustic analysis of these structures, appropriate formulations are also provided. Furthermore, an overview of the thematic correspondent is carried out. Since the type of material used in these constructions can be very important in sound insulation, the significance of this subject is remarked. The papers are then classified based on their acoustic excitation fields containing plane wave, diffuse, random, and point source. After analyzing the research approaches according to different environmental properties, the articles are ordered based on their boundaries as finite and infinite. To present reliable outcomes, it is necessary to investigate a proper theory proportional to the structure’s thickness. Herewith, this issue is also discussed in detail. The review is also expanded to focus on the different vibroacoustic solutions. Before concluding remarks, the authors' research works are presented wherein either optimization algorithms or control techniques improve the acoustic performance of these structures.

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“…The noise in an aircraft cabin is mainly sourced from structural vibration and air noise caused by an engine outside the cabin as well as air flows. To reduce vibration and noise, traditional measures mainly control low-frequency and mid-frequency structural vibration and noise through applying a damping layer to the panels, and sound absorption cotton is also laid to absorb high-frequency air noise [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

A novel MPP-NSGA algorithm and its application in optimization for radiated noises in the aircraft cabin

Li¹,

Liu²,

Zhang³

et al. 2017

J. vibroeng.

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The paper used the AML method to compute transmission loss of aircraft panels and verifies correctness of the numerical simulation model by experimental test. Finally, this paper used an improved genetic algorithm to conduct a multi-objective optimization for the cabin noise. When the analyzed frequency is less than 250 Hz, transmission loss decreased rapidly with the increased analysis frequency, and decreased from the maximum 63.2 dB to 18.5 dB. Within 250 Hz-4000 Hz, the transmission loss gradually increased with the increased analysis frequency. At 250 Hz, the transmission loss had an obvious valley value. Sound radiation power was then computed based on boundary element method, and panel contribution analysis was conducted to find those panels which had an obvious impact on the cabin noise. Therefore, a multi-objective optimization was conducted on these panels and reinforced ribs. In order to further verify effectiveness of the MPP-NSGA method, it was compared with the traditional GA model and NSGA model. Optimization accuracy using MPP-NSGA model is increased, and optimization time is reduced. Through optimization with traditional GA method, the maximum sound power level decreased by 15.4 %, and the total sound power level decreased by 21.9 %. Through optimization with the NSGA method, the maximum sound power level decreased by 21.7 %, and the total sound power level decreased by 29.0 %. Through optimization with the MPP-NSGA method, the maximum sound power level decreased by 46.3 %, and the total sound power level decreased by 36.0 %. Therefore, compared with other two kinds of genetic algorithms, the MPP-NSGA method is obviously superior in noise optimization in the cabin. In the whole analysis frequency band, noise of the optimized cabin panel at each frequency point was smaller than that of the original structure, fully verifying feasibility of the optimization algorithm proposed in the paper. In addition, in the optimized structure, no panel made obvious contributions to the cabin noise, and each panel showed an equivalent contribution level. Transmission loss of the optimized cabin panel was obviously improved. However, the sound insulation valley still appeared at 250 Hz, but it was not so obvious like the original structure. After optimization, the sound insulation valley was 31.6 dB. The sound insulation valley of the original structure was 18.5 dB. Obviously, the sound insulation valley value of the optimized structure was increased by double compared with the original structure. This paper provided a valuable reference for noise reduction in the aircraft cabin.

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The effects of voids and recesses on the transmission loss of honeycomb sandwich panels

Cited by 8 publications

References 0 publications

A review of the vibroacoustics of sandwich panels: Models and experiments

A review of the vibroacoustics of sandwich panels: Models and experiments

Prediction of acoustic wave transmission features of the multilayered plate constructions: A review

A novel MPP-NSGA algorithm and its application in optimization for radiated noises in the aircraft cabin

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