Interior Aircraft Noise Computations due to TBL Excitation using the Energy Finite Element Analysis 2009-01-2248

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.