A SHOCK WAVE ATTENUATION TREATMENT FOR BALLISTIC RANGES

Authors
  1. Heckman, D.
  2. Lahaye, C.
  3. Moir, L.
  4. and others
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
The studies at DREV have been concerned with a wide range of shock deflection schemes and attenuation schemes using acoustic materials. Deflection schemes have not proved adequate because of diffraction effects, while normally highly absorbent acoustic materials appear very reflective at the low pressures to which the ranges are evacuated. However, a treatment based on smoothly tapered fiberglass wedges, installed as shown in Fig. 4, has been found to produce significant improvement. Figure 5 compares test results obtained in firings through untreated and treated cylinders using Atlantic Research Corporation LC-5 pressure transducers; the reflected shocks evident in the former case cannot be detected in the latter. Electrostatic probe results indicate a significant reduction in wake disturbance with the wedge treatment, provided the range geometry is symmetrical. Some residual effect does remain, probably due to the presence of a smeared pressure distribution persisting as a result
Report Number
REPR-46/70 —
Date of publication
15 Jul 1970
Number of Pages
3
Reprinted from
AIAA J, vol 8, no 7, 1970, p1355-1357
DSTKIM No
71-08137
CANDIS No
11633
Format(s):
Originator's fiche received by DSIS

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