Accession Number:

AD0687222

Title:

A NEW EXPLOSIVES TECHNIQUE FOR SYNTHESIZING A WIDE RANGE OF PRESSURE WAVEFORMS IN AIR. PART I. APPROXIMATE THEORY OF AIR BLAST FROM EXTENDED EXPLOSIVE CHARGES,

Descriptive Note:

Corporate Author:

EXPLOSIVES RESEARCH AND DEVELOPMENT ESTABLISHMENT WALTHAM ABBEY (ENGLAND)

Personal Author(s):

Report Date:

1968-10-02

Pagination or Media Count:

29.0

Abstract:

A new technique for generating air blast waves using spatially extended explosive charges has been devised. It has been found to be capable of synthesizing pressure waveforms having a wide range of shapes and durations and was applied, among other things, to the simulation of sonic bangs, the applications of the technique being described separately in the second part of the report ERDE 10R68. In this first part of the report a phenomenological theory of the air blast from such charges is developed under certain simplifying assumptions. These assumptions are firstly that the given spatial distribution of explosive may be reduced to an equivalent linear distribution in the line-of-sight by making an extension of the energy hypothesis commonly applied to the case of spherically symmetric explosions. Secondly, this linear distribution is in turn regarded as an infinite set of elementary linear charge elements generating acoustic wavelets the combined effects of which are obtained by linear superposition. For such a model of the air blast process, the pressure wave in the far field may be represented exactly in terms of an assumed shape of element waveform. Author

Subject Categories:

  • Ammunition and Explosives
  • Explosions

Distribution Statement:

APPROVED FOR PUBLIC RELEASE