Experimental measurements were conducted to determine the effect of ground conditions near the source on blast noise levels. The measurements were conducted at two locations, one with temperature soil conditions and one with a seasonal snow cover. Pressure sensors were used to record the waveforms produced by the detonation of 0.57-kg charges of C4 explosive at distances between 10 m and 110 m. The measured blast waveforms were elongated and the peak amplitudes were significantly reduced at all distances when a snow cover was present. These measurements show that the interaction of the blast wave with the ground near the explosion is an important factor in the blast noise levels received at long propagation distances. This finding indicates that modification or control of the ground properties near military artillery training locations is a potential method of mitigating the noise produced by these activities.
Reduction of blast noise by a snow cover
Noise Control Engineering Journal ; 50 , 6 ; 200-203
2002
4 Seiten, 21 Quellen
Article (Journal)
English
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