Development of a Multistream Acoustic Propagation Model Including Scattering by Turbulence.
Abstract
The objective of the ARL research effort in acoustic propagation is to provide the Army with a multistream model for investigating acoustic detection systems operating in a variety of realistic battlefield conditions. The first step is to account for scattering from turbulent regions of the atmosphere with an explicit algorithm. The turbulent region is considered to be a collection of vortices with a distribution of characteristic sizes and velocities and random orientation and position. Each vortex (turbule) is characterized as a known (or assumed) velocity distribution in three dimensional space. The scattering from each turbule is determined by solving the fluid equations. The contribution to the sound pressure level at the detector location of all turbules is summed up accounting for the propagation characteristics of the atmospheric medium. The algorithms devised to model the above picture of the turbulent region are then used in existing (or appropriately modified) propagation models. Progress in incorporating turbulence scattering into the Past Field Program (PFP) acoustic propagation model is recounted in this report. (MM)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1995
- Accession Number
- ADA296565
Entities
People
- Daniel M. Brown
- Harry J. Auvermann
- Richard L. Reynolds
Organizations
- United States Army Research Laboratory