SOME MEASUREMENTS OF THE SONIC BANGS PRODUCED AT EXERCISE WESTMINISTER
EXPLOSIVES RESEARCH AND DEVELOPMENT ESTABLISHMENT WALTHAM ABBEY (UNITED KINGDOM)
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Opportunity was taken at Exercise WESTMINISTER to make recordings of sonic bang waveforms for use as standards of comparison by which the explosively generated simulant waveform under development at ERDE could be judged. A variation of the sonic bang waveform along the aircraft track, first reported in the USA, was observed in this country for the first time. From the recorded waveforms, energy spectra and loudness values were computed, corresponding to the median and extreme forms of the variation. It is concluded that 1 the subjective effects of sonic bangs can vary markedly with the location of the observer along the aircraft track, even though the flight conditions and local topography are constant, and 2 the ERDE Mark I explosive simulant is very suitable for the assessment of the effects of sonic bangs on building structures.