Low-Frequency Noise Impulses from Explosions

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Abstract
For military noise evaluation, noise impulses from explosions of 60 g – 2 20 kg equivalents of TNT (trinitrotoluene) were measured at distances of 10 – 300m. Noie and air-blast sensors (an LC-33 pencil gauge, a Kistler 6103 detonation sensor, B&K 8103 and B&K 8105 hydrophones and a B&KI 4136 microphone) were used for the measurements. The peak values, A-durations, impulse energies and frequency transforms were usually analysed from the tape-recorded signals (waveform analyser DATA 6000). At a distance of 100m, the means of the 60 g and 20 kg explosions were as follows: 144 dB and 163 dB for the peak values, 4.0 ms and 13.0 ms for the A-durations, 250 Pa 2s and 51 kPa 2s for the impulse energies, and 1200 Hz and 15 Hz for the most prominent frequencies, respectively. The peak levels decreased 5–8 dB when the distance was doubled. A graphic nomogram was formed from the peak values for training, safety, and noise control purposes.

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