This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Interior Aircraft Noise Computations due to TBL Excitation using the Energy Finite Element Analysis
Technical Paper
2009-01-2248
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The Energy Finite Element Analysis (EFEA) has been developed for evaluating the vibro-acoustic behavior of complex systems. In the past EFEA results have been compared successfully to measured data for Naval, automotive, and aircraft systems. The main objective of this paper is to present information about the process of developing EFEA models for two configurations of a business jet, performing analysis for computing the vibration and the interior noise induced from exterior turbulent boundary layer excitation, and discussing the correlation between test data and simulation results. The structural EFEA model is generated from an existing finite element model used for stress analysis during the aircraft design process. Structural elements used in the finite element model for representing the complete complex aircraft structure become part of the EFEA structural model. Solid acoustic elements are generated for all interior acoustic spaces and for modeling the acoustic fiberglass treatment placed between the fuselage and the trim panels. Simulations are performed for a untreated fuselage configuration (fuselage without acoustic treatment) and for a green configuration (fuselage + acoustic treatment and trim panels). The structural vibration and the interior SPL is computed by the EFEA. For both configurations the simulation results are validated through comparison to the test data.
Recommended Content
Authors
Topic
Citation
de Lima, W., Vlahopoulos, N., Sbragio, R., and He, J., "Interior Aircraft Noise Computations due to TBL Excitation using the Energy Finite Element Analysis," SAE Technical Paper 2009-01-2248, 2009, https://doi.org/10.4271/2009-01-2248.Also In
References
- Vlahopoulos N. Garza-Rios L.O. Mollo C. 1999 “Numerical implementation, validation, and marine applications of an energy finite element formulation” Journal of Ship Research 43 143 156
- Zhang W. Wang A. Vlahopoulos N. Wu K. 2003 “High frequency vibration analysis of thin elastic plates under heavy fluid loading by an energy finite element formulation” Journal of Sound and Vibration 263 21 46
- Zhang W. Wang A. Vlahopoulos N. 2002 “An alternative energy finite element formulation based on incoherent orthogonal waves and its validation for marine structures” Finite Elements in Analysis and Design 38 1095 1113
- Zhang W. Vlahopoulos N. Wu K. 2005 “An energy finite element formulation for high frequency vibration analysis of externally fluid-loaded cylindrical shells with periodic circumferential stiffeners subjected to axi-symmetric excitation” Journal of Sound and Vibration 282 679 700
- Zhang W. Vlahopoulos N. Wu K. Wang A. 2005 “High Frequency Vibration Analysis of Stiffened Plates under Heavy Fluid Loading by an Energy Finite Element Analysis Formulation,” Finite Elements in Analysis and Design 41 11-12 1056 1078
- Wang A. Vlahopoulos N. Buehrle R. D. Klos J. 2005 “Energy Finite Element Analysis of the NASA Aluminum Testbed Cylinder,” SAE Paper 2005-01-2372 2005 SAE Noise and Vibration Conference Traverse City, Michigan
- Vlahopoulos N. Wang A. Wu K. 2005 “An EFEA formulation for computing the structural response of complex structures,” Proceedings of IMECE 05, 2005 ASME IMECE Orlando FL Paper Number IMECE2005-81113
- Zhang G. Vlahopoulos N. “Validation of an EFEA formulation for computing the vibrational response of complex structures,” 2007 SAE Noise and Vibration Conference, SAE Paper No. 2007-01-2324 SAE 2007 Transactions of Passenger Cars - Mechanical Systems
- Zhang G. Vlahopoulos N. “A substructuring formulation for the energy finite element analysis,” 2007 SAE Noise and Vibration Conference, SAE Paper No. 2007-01-2325 SAE 2007 Transactions of Passenger Cars - Mechanical Systems
- Dong J. Choi K.K. Wang A. Zhang W. Vlahopoulos N. “Parametric design sensitivity analysis of high-frequency structural-acoustic problems using energy finite element method,” International Journal for Numerical Methods in Engineering 62 83 112 2005
- MES/EFEA2.0 User's Manual Michigan Engineering Services LLC 2007
- de Lima W. J. Wang A. Vlahopoulos N. “Prediction of the Vibroacoustic Response of a Business Jet using Energy Finite Elements,” Noise-Con 2008 Dearborn, MI July 2008
- Allard J.F. Champoux Y. 1992 New empirical equations for sound propagation in rigid frame fibrous materials Journal of the Acoustical Society of America 91 3346 3353
- Yan X. “Energy Finite Element Developments for High Frequency Vibration Analysis of Composite Structures,” Department of Naval Architecture and Marine Engineering, University of Michigan 2008
- Cockburn A. Robertson J.E. 1974 Vibration response of spacecraft shrouds to in-flight fluctuating pressures Journal of Sound and Vibration 33 4 399 425
- Hwang Y.F. Bonness W.K. Hambric S.A. 2008 Comparison of semi-empirical models for turbulent boundary layer wall pressure spectra Journal of Sound and Vibration