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Design of Lightweight Fibrous Vibration Damping Treatments to Achieve Optimal Performance in Realistic Applications
ISSN: 0148-7191, e-ISSN: 2688-3627
Published June 5, 2019 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
In recent work, it has been shown that conventional sound absorbing materials (e.g., lightweight fibrous media) can provide structural damping when placed adjacent to vibrating structures, including infinite panels, partially-constrained panels and periodically-supported panels typical of aircraft structures. Thus, a fibrous layer may serve two functions at once: absorption of airborne sound and the reduction of structure-borne vibration. It has also been found that the damping is primarily effective below the critical frequency of the structure, and that the damping results from viscous interaction between the fibrous layer and the evanescent near-field of the panel, in the region where incompressible flow caused by the panel vibration oscillates primarily parallel with the panel surface. By using a near-field damping (NFD) model based on the Biot model for acoustical porous media, it has been shown that a properly-optimized fibrous layer can provide levels of damping comparable with those provided by conventional, constrained-layer, visco-elastic, damping treatments. Based on the idea that vibrating structures exhibit a certain wavenumber/frequency response spectrum, the focus of the current study has been on evaluating the power dissipated by a fibrous treatment as a function of wavenumber and frequency, and on identifying the material microstructure (i.e., fiber size) required to maximize the power dissipation, and hence damping, in a specific wavenumber/frequency range. To demonstrate the wavenumber/frequency-matching procedure, an example involving a simplified model of a vehicle component will be considered here, and it will be shown how a fibrous layer can be designed to maximize its damping effectiveness when applied to a realistic base structure, such as an automotive floor pan.
CitationXue, Y., Bolton, J., and Herdtle, T., "Design of Lightweight Fibrous Vibration Damping Treatments to Achieve Optimal Performance in Realistic Applications," SAE Technical Paper 2019-01-1524, 2019, https://doi.org/10.4271/2019-01-1524.
Data Sets - Support Documents
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- Gerdes, R.W., Alexander, J.H., Gardner, B.K., Lai, H.-Y., and Bolton, J.S. , “The Use of Poro-Elastic Finite Elements to Model the Structural Damping Effect of Fibrous Acoustical Treatments,” in Proceedings of Noise-Con, Ypsilanti, MI, April 1998, 409-414, presentation, https://docs.lib.purdue.edu/herrick/195.
- Nadeau, S., Champoux, Y., and Mongeau, L. , “Trim and Floor Influence on Vibrational Response of an Aircraft Model,” Journal of Aircraft 36(3):591-595, 1999, doi:10.2514/2.2475.
- Cummings, A., Rice, H.J., and Wilson, R. , “Radiation Damping in Plates, Induced by Porous Media,” Journal of Sound and Vibration 221(1):143-167, 1999, doi:10.1006/jsvi.1998.1987.
- Gerdes, R.W., Alexander, J.H., Gardner, B.K., Lai, H.-Y., and Bolton, J.S. , “Numerical Modeling of the Damping Effect of Fibrous Acoustical Treatments,” SAE Technical Paper 2001-01-1462, 2001, doi:10.4271/2001-01-1462.
- Tomlinson, D., Craik, R.J.M., and Wilson, R. , “Acoustic Radiation from a Plate into a Porous Medium,” Journal of Sound and Vibration 273(1-2):33-49, 2004, doi:10.1016/j.jsv.2003.04.003.
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- Xue, Y. and Bolton, J.S. , “Microstructure Design of Lightweight Fibrous Material Acting as a Layered Damper for a Vibrating Stiff Panel,” The Journal of the Acoustical Society of America 143(6):3254-3265, 2018, doi:10.1121/1.5038255.
- Xue, Y., Bolton, J.S., Gerdes, R.W., Lee, S., and Herdtle, T. , “Prediction of Airflow Resistivity of Fibrous Acoustical Media having Two Fiber Components and a Distribution of Fiber Radii,” Applied Acoustics 134:145-153, 2018, doi:10.1016/j.apacoust.2018.01.011.
- Xue, Y. and Bolton, J.S. , “Fibrous Material Microstructure Design for Optimal Damping Performance,” in Proceedings of the Symposium on the Acoustics of Poro-Elastic Materials (SAPEM), Le Mans, France, December 2017, presentation, http://docs.lib.purdue.edu/herrick/168.
- Xue, Y., and Bolton, J.S. , “Fibrous Material Microstructure Design for Optimal Structural Damping,” The Journal of the Acoustical Society of America 143(3):1715, 2018, presented at 175th ASA Meeting, Minneapolis, MN, May 2018, presentation, https://docs.lib.purdue.edu/herrick/176.
- Xue, Y., Bolton, J.S., Herdtle, T., Lee, S. and Gerdes, R.W. , “A Comparison between Glass Fibers and Polymeric Fibers when Serving as a Structural Damping Medium for Fuselage-Like Structures,” in Proceedings of the Inter-Noise, Chicago, IL, August 2018, paper 1478, 12 pages, presentation, https://docs.lib.purdue.edu/herrick/179.
- Xue, Y., Bolton, J.S., Herdtle, T., Lee, S. and Gerdes, R.W. , “Structural Damping by Layers of Fibrous Media Applied to a Periodically Constrained Vibrating Panel,” in Journal of Physics: Conference Series (in press) and Proceedings of Recent Advances in Structural Dynamics (RASD), Lyon, France, April 2019, presentation, to appear on https://docs.lib.purdue.edu/herrick/.
- Xue, Y, Bolton, J.S., Herdtle, T., Lee, S., and Gerdes, R.W. , “Structural Damping by Lightweight Poro-Elastic Media,” Journal of Sound and Vibration (in review), 2019.
- Bolton, J.S. , “Porous Materials for Sound Absorption and Transmission Control,” in Proceedings of the Inter-Noise, Rio de Janeiro, Brazil, August 2005, paper 2084, 20 pages, presentation, http://docs.lib.purdue.edu/herrick/50.