Affiliations: Department of Naval Architecture and Marine Engineering, University of Michigan, 2600 Draper Road, 214 NA&ME Bldg., Ann Arbor, MI 48109–2145, USA | Detroit Diesel Corporation, 13400 Outer Drive, West, Detroit, MI 48239–4001, USA | Automated Analysis Corporation, 2805 S. Industrial, Suite 100, Ann Arbor, MI 48104–6767, USA
Note: [] Corresponding author.
Abstract: In this paper a new methodology is presented for applying measured accelerations and forces as excitation on a structural finite element model in order to perform a forced frequency response analysis. The computed vibration constitutes the excitation for an acoustic boundary element analysis. The new developments presented in this paper are associated with: the equivalent force method that can prescribe the acceleration at certain parts of the structure; the integration within a single process of test data that define the excitation, with the vibration analysis, and the acoustic prediction; the utilization of the new technology in simulating the noise radiated from a running engine and determining the effects of design changes. Numerical results for noise radiated from a running engine are compared to test data for a baseline design. The effect of two structural design modifications on the radiated noise is computed, and conclusions are deduced.
Keywords: Boundary element analysis, finite element analysis, engine noise
