Comparison of NOISEMAP Computer Program with and without the SAE Lateral Attenuation Model
BOLT BERANEK AND NEWMAN INC CANOGA PARK CA
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This study compares the noise contours generated by using the lateral attenuation model presently incorporated in NOISEMAP and the new SAE attenuation model. Because the SAE model assumes higher attenuation values than those now used in NOISEMAP, contours based upon the SAE model are smaller in area than those based upon NOISEMAP. In comparing the two attenuation models, the areas within SEL contours were calculated for both the F-4 and the B-52 airplanes. Additionally, the SEL contours using the two attenuation models were computed for the takeoff and landing operations associated with the F-4. Field measured data at a civilian airport in California were used in order to compare the effectiveness of the two attenuation models when applied to calculating single event and cumulative noise exposure contours. In general both models yielded predicted values that agreed well with field measured data for elevation angles of 25 degrees and higher. However, field measured data were simply not available at more critical lower elevation angles zero to 25 degrees, and thus it was not possible to conclude at this time which attenuation model is better. Additional studies are recommended in order to directly compare the predicted noise environments using these two different lateral attenuation models with field measured data at elevation angles of zero to 25 degrees.
- Computer Programming and Software