| Autor: |
Raspet, Richard, Ezell, Jean, Coggeshall, Stephen V. |
| Zdroj: |
Journal of the Acoustical Society of America; 1986, Vol. 79 Issue 5, p1326-1334, 9p |
| Abstrakt: |
Blast walls and barriers are often proposed for reducing noise from explosives or artillery fire. The calculation of blast noise reduction by three-dimensional finite difference flow field codes is expensive and computer time intensive. For many cases, the source strength at the barrier is neither very strong nor very weak (acoustical). In this paper, a combined theoretical and experimental model study to investigate the range of validity of linear transient diffraction theory is described. Also, this paper further investigates the use of a finite wave propagation program to extend the utility of the linear calculation. This study demonstrates that the linear theory, with an accurate input waveform, can predict the insertion loss to within 1.5 dB for peak sound-pressure levels less than 162 dB at the barrier. For the source levels greater than 162 dB, the prediction significantly underestimates the insertion loss. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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