Citation

Kong B, Lee K, Lee S. J. Acoust. Soc. Am. 2012; 131(4): 3532.

Affiliation

School of Mechanical and Aerospace Engineering, Seoul National University 301-1214, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea, bhgong03@snu.ac.kr.

Copyright

(Copyright © 2012, American Institute of Physics)

DOI

unavailable

PMID

22502463

Abstract

In the present study, acoustic signals from M40A1 recoilless rifle were measured according to recommendations of International Organization of Standardization (ISO) using B&K 2250 sound analyzers. Contrary to expectations from previous studies about shooting noise, the signal recorded at each point shows different waveform in comparison with the others. This means that an additional acoustic source was present, and there was no doubt that it was located at a tail nozzle of the weapon through temporal and geometric relations between the microphone arrays. Spectral analysis and frequency band filter were used to find out what kind of acoustic source there was, and it was concluded that acoustic properties of the additional source was much close to those of jet noise rather than blast noise. Based on these results, consequently, a hybrid model has been developed to predict the sound pressure level of shooting noise from recoilless rifles using predicting algorithms applicable to acoustic sources, blast noise and jet noise, relatively.

Language: en