Acoustic signatures of ground combat vehicles are very important to their survivability. In particular, low frequency tones can be used to identify vehicles beyond the line of site. In the range of 10-200 Hz, the structure-borne acoustic radiation is mainly due to the track force/moment inputs. In this work, full-vehicle models were developed to numerically simulate the radiated acoustic signature at the design stage. The loads applied on the hull of the vehicle were computed from a specialized code previously developed by the US Tank Command (TACOM). It simulates the interaction of the hull, sprocket, idler, roadwheels, roadarms, and track. The loads generated from this analysis comprise the excitation for the vibration calculations. The boundary element method was used to compute the radiated sound pressure in the semi anechoic condition after mapping normal vibration velocities (calculated from a finite-element model) onto the vehicle's surfaces. Description of the entire process of generating the loads, incorporating them in the finite element analysis, and using the vibration results for the acoustic signature of the army vehicle is presented. This program is partially funded by an U.S. Army SBIR contract granted to Automated Analysis Corporation (AAC).
Numerical load generation, vibration analysis, and acoustic signature prediction of a ground vehicle
1997
6 Seiten, 8 Quellen
Conference paper
English
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