This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Design of Lightweight Fibrous Vibration Damping Treatments to Achieve Optimal Performance in Realistic Applications
Technical Paper
2019-01-1524
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
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.
Recommended Content
Authors
Citation
Xue, 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
Title | Description | Download |
---|---|---|
Unnamed Dataset 1 |
Also In
References
- Bruer , C. and Bolton , J. S. Vibro-Acoustic Damping of Extended Vibrating Systems Proceedings of AIAA Aeroacoustics Conference Palo Alto, CA 1987 10.2514/6.1987-2661
- Lai , H.-Y. , Bolton , J.S. and Alexander , J.H. Structural Damping by the Use of Fibrous Blankets Proceedings of Noise-Con Ypsilanti, MI 1998 403 408 http://docs.lib.purdue.edu/herrick/18
- 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 Proceedings of Noise-Con Ypsilanti, MI 1998 409 414 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 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 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 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 10.1016/j.jsv.2003.04.003
- Kim , N. , Lee , S. , Bolton , J.S. , Hollands , S. , and Yoo , T. Structural Damping by the Use of Fibrous Materials SAE Technical Paper 2015-01-2239 2015 10.4271/2015-01-2239
- 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 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 10.1016/j.apacoust.2018.01.011
- Xue , Y. and Bolton , J.S. Fibrous Material Microstructure Design for Optimal Damping Performance Proceedings of the Symposium on the Acoustics of Poro-Elastic Materials (SAPEM) Le Mans, France 2017 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 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 Proceedings of the Inter-Noise Chicago, IL 2018 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 Journal of Physics: Conference Series (in press) and Proceedings of Recent Advances in Structural Dynamics (RASD) Lyon, France 2019 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 2019
- Bolton , J.S. Porous Materials for Sound Absorption and Transmission Control Proceedings of the Inter-Noise Rio de Janeiro, Brazil 2005 http://docs.lib.purdue.edu/herrick/50