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Transmission loss of honeycomb sandwich structures with attached gas layers |
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| Authors: | Christina J. Naify Changzheng Huang Matthew Sneddon Steve Nutt |
| Affiliation: | 1. M.C. Gill Composites Center, Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089-0241, USA;2. Wavefront Scientific, 4442 York Blvd., Suite 10, Los Angeles, CA 90041, USA;1. Environmental Acoustics Laboratory, Department of Architecture, Graduate School of Engineering, Kobe University, Rokko, Nada, Kobe 657-8501, Japan;2. Kajima Technical Research Institute, Tobitakyu, Chofu, 182-0036 Tokyo, Japan;1. National Institute of Aerospace, 100 Exploration Way, Hampton, VA 23666-6186, United States;2. NASA Langley Research Center, 2 North Dryden Street (MS 463, Bldg 1208), Hampton, VA 23681-2199, United States;1. Vibroacoustics & Complex Media Research Group, LTDS-CNRS UMR 5513, Ecole Centrale de Lyon, Écully, 69134, France;2. Pasta-Lab, Dipartimento di Ingegneria Industriale, Universitá degli Studi di Napoli Federico II, Napoli, 80125, Italy;1. Institute of Mechanics, Otto-von-Guericke-Universität, Magdeburg, Germany;2. School of Engineering and Applied Sciences, Harvard University, USA |
| Abstract: | Layering gasses of differing acoustic impedances on a panel substantially reduced the amount of sound energy transmitted through the panel with respect to the panel alone or an equivalent-thickness single species gas layer. The additional transmission loss derives from successive impedance mismatches at the interfaces between gas layers and the resulting inefficient energy transfer. Attachment of additional gas layers increased the transmission loss by as much as 17 dB at certain frequencies. The location and ordering of the gasses with respect to the panel were important factors in determining the magnitude of the total transmission loss. Theoretical analysis using a transfer matrix method was used to calculate the frequency dependence of sound transmission for the different configurations tested. The method accurately predicted the relative increases in transmission loss observed with the addition of different gas layer configurations. |
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