Acoustic Transient Signal Study.
Abstract
The acoustic properties of a mechanical impact generator, the IMP MOD X-1, were measured in the near and far field. The pressure waveform had excellent reproducibility in peak pressure, pulsewidth, rise time, and decay. The peak pressure at 1 yard, on-axis, was 141 db re 1 microbar and the pulsewidth was 33 microsec. In general, about 50% of the energy was below 14kc and 85% below 35kc. For ranges greater than 3 yards, the -3db beamwidth was 17 degrees + or - 3 degrees. The waveform was represented by five (5) complex conjugate pairs of decaying exponentials with an accuracy (in the mean-squared sense) at 2.66% or better. Although the cavitation limit for C-W intensity was greatly exceeded during tests, there was no evidence of cavitation. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1966
- Accession Number
- ADA031794
Entities
People
- Alan A. Winder
- Allan N. Cohen