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Title: Modeling and observations of an elevated, moving infrasonic source: Eigenray methods

Journal Article · · Journal of the Acoustical Society of America
DOI: https://doi.org/10.1121/1.4980096 · OSTI ID:1467369
 [1];  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of Mississippi, Oxford, MS (United States). National Center for Physical Acoustics (NCPA)

In this paper, the acoustic ray tracing relations are extended by the inclusion of auxiliary parameters describing variations in the spatial ray coordinates and eikonal vector due to changes in the initial conditions. Computation of these parameters allows one to define the geometric spreading factor along individual ray paths and assists in identification of caustic surfaces so that phase shifts can be easily identified. A method is developed leveraging the auxiliary parameters to identify propagation paths connecting specific source-receiver geometries, termed eigenrays. The newly introduced method is found to be highly efficient in cases where propagation is non-planar due to horizontal variations in the propagation medium or the presence of cross winds. Finally, the eigenray method is utilized in analysis of infrasonic signals produced by a multi-stage sounding rocket launch with promising results for applications of tracking aeroacoustic sources in the atmosphere and specifically to analysis of motor performance during dynamic tests.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20); LANL Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1467369
Report Number(s):
LA-UR--17-20026
Journal Information:
Journal of the Acoustical Society of America, Journal Name: Journal of the Acoustical Society of America Journal Issue: 4 Vol. 141; ISSN 0001-4966
Publisher:
Acoustical Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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  • The Journal of the Acoustical Society of America, Vol. 105, Issue 6 https://doi.org/10.1121/1.424634
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Cited By (3)

Propagation Modeling Through Realistic Atmosphere and Benchmarking book October 2018
Estimating tropospheric and stratospheric winds using infrasound from explosions text January 2019
A Three‐Dimensional Array for the Study of Infrasound Propagation Through the Atmospheric Boundary Layer journal August 2019