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Hybrid FE-SEA Modeling and Experimental Validation of an Aircraft Floor Structure for the Analysis of Vibration Isolators
Technical Paper
2012-36-0526
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The Hybrid FE-SEA method is a recently developed numerical technique that deals with the so-called mid-frequency problem. Such problems involve the dynamic analysis of systems that include, at the same frequency range, components with high and low modal density. Systems with a reduced number of modes are usually modeled using deterministic methods, as the Finite Element (FE) Method, while modal dense systems need to be treated by means of statistical methods such as the Statistical Energy Analysis (SEA). Neither FE nor SEA can properly describe a system that displays the mid-frequency behavior due to a prohibitive computational cost (FE) or the lack of accuracy (SEA). The floor structure of an aircraft is a typical case of a mid frequency problem, where the floor beams are relatively rigid and have very few modes while the floor panels have a very high modal density. These characteristics considerably complicate the design of the vibration isolators installed between the floor beams and the floor panels. In this study, the floor structure is modeled using the Hybrid FE-SEA method, with the floor beams as FE subsystems and the floor panels as SEA subsystems. The model of each component is separately validated through experimental tests, and later coupled as a Hybrid FE-SEA model. Finally, the numerical results from the Hybrid FE-SEA model are compared with experimental results validating its performance.
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Authors
- Gregorio G. Azevedo - Federal University of Santa Catarina
- Marcelo Bustamante - Federal University of Santa Catarina
- Julio A. Cordioli - Federal University of Santa Catarina
- Samir N. Y. Greges - Federal University of Santa Catarina
- Jeff Weisbeck - ITT - Enidine Inc.
- Andre de Oliveira - ESI South America
Citation
Azevedo, G., Bustamante, M., Cordioli, J., Greges, S. et al., "Hybrid FE-SEA Modeling and Experimental Validation of an Aircraft Floor Structure for the Analysis of Vibration Isolators," SAE Technical Paper 2012-36-0526, 2012, https://doi.org/10.4271/2012-36-0526.Also In
References
- Wilby, J.F. “Aircraft interior noise” Journal of Sound and Vibration 1996 190 3 545 564
- Bhat, W.V. Wilby, J.F. “Interior noise radiated by an airplane fuselage subjected to turbulent boundary layer excitation and evaluation of noise reduction treatments” Journal of Sound and Vibration 18 4 449 464 1971
- Hain, H.L. Vibration isolation insert for aircraft floor panels and the like 1999 US Patent 5,876,024
- Wright, R.I. Kidner, M.R.F. “Vibration absorbers: A review of applications in interior noise control of propeller aircraft” Journal of Vibration and Control 10 8 1221 1237 2004
- Shorter, P.J. Langley, R.S. “On the reciprocity relationship between direct field radiation and diffuse reverberant loading” Journal of the Acoustal Society of America 117 1 85 95 2005
- Shorter, P.J. Langley, R.S. “Vibro-acoustic analysis of complex systems.” Journal of Sound and Vibration 288 3 669 699 2005
- Langley, R.S. Cordioli, J.A. “Hybrid deterministic-statistical analysis of vibro-acoustic systems with domain couplings on statistical components” Journal of Sound and Vibration 321 893 912 2009
- Cordioli, J.A. COTONI, V. “Review of some industrial applications of the hybrid FE-SEA method to vibro-acoustic prediction and analysis” Proceeding of NOVEM Oxford - UK 2009
- VA One 2011 “User's Guide, ESI Group” Nov. 2011
- Clarkson, B. L. Ranky, M. F. “Modal density of honeycomb plates” Journal of Sound and Vibration 1983 91 103 118