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Modeling Directionally Radiating Acoustical Enclosures to Determine Noise Levels
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English
Abstract
A computer modeling procedure has been developed to assess the effect of an enclosure on far-field noise levels. The model accounts for directional radiation patterns and enclosure diffraction effects for each of the six sides. Each side is represented as a point source, and for a given receiver location, all possible noise paths are appropriately weighted and summed. Application is made for several tractor shovels which use various design changes directed towards meeting Environment al Protection Agency standards. Comparisons between predictions and test measurements show good agreement.
Authors
Citation
O'Keefe, E., "Modeling Directionally Radiating Acoustical Enclosures to Determine Noise Levels," SAE Technical Paper 810699, 1981, https://doi.org/10.4271/810699.Also In
References
- Noise Emmission Standards for Wheel and Crawler Tractors, SAN No. 1172. ONAC 77-2.
- Beranek L.L. Noise and Vibration Control, McGraw-Hill New York 1971
- O'Keefe E.J. Stew art D.R. “Insertion Loss Measurements of Small Rectangular Enclosures” Noise Control Engineering, July/Aug 1980
- Tweed L.W. Tree D.R. “Three Methods for Predicting the Insertion Loss of Close-Fitting Enc losures” Noise Control Engineering March/April 1978
- Ver I.L. “Reduction of Noise by Acoustical Enclosures” Isolation and Mechanical Vibration, Impact and Noise” Snowden J.C. Ungar E. ASME Serial AMD 1 1973 192 220