Results 231 to 240 of about 3,427 (254)

Hydroacoustic blockage prediction and measurement at Diego Garcia using the Adiabatic Mode Parabolic Equation Model

The Journal of the Acoustical Society of America, 2008
Underwater explosion monitoring with sparse sensors at long ranges relies on the efficient propagation of acoustic energy in the sound fixing and ranging (SOFAR) channel. When sound traveling in this channel encounters an island or seamount, it will either diffract, scatter, or be converted into seismic energy.
Zachary Upton, Michael D. Collins, Jay Pulli   +2 more
openaire   +1 more source

A ray mode parabolic equation, and examples of its application in shallow water acoustics propagation problems

Proceedings of Meetings on Acoustics, 2015
A ray mode adiabatic parabolic equation has been derived by the multi-scale expansions method. From this equation a single-mode Helmholtz equation has been obtained. Then, by using Babich method, we have obtained a mode parabolic equation in the ray centered coordinates from the derived Helmholtz equation.
Mikhail Yu. Trofimov, Sergey B. Kozitskiy, Alena D. Zakharenko, Pavel S. Petrov   +3 more
openaire   +1 more source

Modeling the acoustic vector field using parabolic equation and normal mode models.

The Journal of the Acoustical Society of America, 2010
Numerical algorithms for computing the acoustic vector field, i.e., particle velocity and pressure from an acoustic propagation model, are introduced. Implementation using both a parabolic equation and normal mode approach is considered. The parabolic equation model employed uses a split-step Fourier algorithm, although application of the technique is ...
openaire   +1 more source

A comparison of parabolic equation models with stepwise coupled modes in a shallow-water range-dependent environment

The Journal of the Acoustical Society of America, 1987
Parabolic equation calculations are compared with stepwise coupled mode COUPLE calculations for a set of runs for which the two models have overlapping capability. The PE calculations were then extended to consider the additional case of refracting sediment. Normal mode start-up fields were used in the calculations.
James M. Syck, Joseph M. Monti
openaire   +1 more source

Analytical Solution of the Parabolic Equation for Guided Mode Disappearance at a Critical Depth

1987
The fundamental problem of guided mode disappearance at a critical depth during upslope propagation in a shallow water waveguide with variable depth overlying a fluid halfspace is reconsidered. Jensen and Kuperman’s numerical solutions based on a parabolic equation (PE) have stimulated a number of analytical and numerical studies based on models in ...
openaire   +1 more source

A Program based on the Wide-Angle Mode Parabolic Equations Method for Computing Acoustic Fields in Shallow Water

Acoustical Physics, 2021
Pavel Petrov, Oleg Zaikin, Petrov P S
exaly  

Wide-Angle Mode Adiabatic Parabolic Equations

Acoustical Physics, 2002
openaire   +1 more source

Wide-angle mode parabolic equations for the modelling of horizontal refraction in underwater acoustics and their numerical solution on unbounded domains

Journal of Sound and Vibration, 2020
Pavel Petrov, Matthias Ehrhardt
exaly  

Sliding‐mode boundary control for perturbed time fractional parabolic systems with spatially varying coefficients using backstepping

Asian Journal of Control, 2023
Bo Zhuang, Juan Chen
exaly  

The coupled mode parabolic equation

Journal of the Acoustical Society of America, 1997
Michael D Collins, Abawi Ahmad T, Kuperman W A   +2 more
exaly