A5048081281- Underwater Acoustics Research
- Underwater Vehicles and Communication Systems
- Acoustic Wave Phenomena Research
- Speech and Audio Processing
- Seismic Waves and Analysis
- Ocean Waves and Remote Sensing
- Coastal and Marine Dynamics
- Lattice Boltzmann Simulation Studies
- Seismic Imaging and Inversion Techniques
National University of Defense Technology
2021-2025
Underwater acoustic propagation is a complex phenomenon in the ocean environment. Traditional methods for calculating loss rely on solving partial differential equations. Deep learning methods, leveraging their robust nonlinear approximation capabilities, can model various physical phenomena effectively, significantly reducing computation time and cost. Despite considerable advancements study of inverse underwater problems, research focused forward modeling still nascent. This proposes an...
A coupled-mode model is a classic approach for solving range-dependent sound propagations and often used to provide benchmark solutions in comparison with other numerical models because of its high accuracy. Existing programs have disadvantages such as computational cost, weak adaptability complex ocean environments, instability. In this paper, new algorithm that uses an improved range normalization “stair-step” global matrix address dependence environments designed. This the Chebyshev–Tau...
With the increasing demand for underwater detection, interest in acoustic field of range-dependent ocean waveguides is also growing. For weakly waveguides, adiabatic modes represent a compromise between accuracy and computational cost occupy an important place simulation numerical sound fields. However, either existing adiabatic-mode programs consider too few layers media or root-finder tends to miss roots. In addition, none can solve excited by line source located anywhere plane. this...
The accurate calculation of the sound field is one most concerning issues in hydroacoustics. one-dimensional spectral method has been used to correctly solve simplified underwater acoustic propagation models, but it difficult actual ocean fields using this model due its application conditions and approximation error. Therefore, necessary develop a direct solution for two-dimensional Helmholtz equation without models. Here, two commonly methods, Chebyshev–Galerkin Chebyshev–collocation, are...
Sound waves can be used to carry out underwater activities. Rapidly and accurately simulating sound propagation is the basis for detection. The wide-angle parabolic model has a good computational speed accuracy currently main numerical mid- low-frequency propagation. classical equation discretized by finite difference method low-order scheme generally adopted. In this paper, based on spectral proposed. depth operators of each layer are via Chebyshev then assembled into global matrix forward...
The accuracy and efficiency of sound field calculations highly concern issues hydroacoustics. Recently, one-dimensional spectral methods have shown high-precision characteristics when solving the but can solve only simplified models underwater acoustic propagation, thus their application range is small. Therefore, it necessary to directly calculate two-dimensional Helmholtz equation ocean propagation. Here, we use Chebyshev–Galerkin Chebyshev collocation model equation. Then, method used...
Acoustic particle velocities can provide additional energy flow information of the sound field; thus, vector acoustic model is attracting increasing attention. In current study, a wavenumber integration (VWI) was established to benchmark solutions ocean propagation. The depth-separated wave equation solved using finite difference (FD) methods with second- and fourth-order accuracy, source singularity in this treated matched interface boundary method. Moreover, velocity calculated method,...
Simulating the acoustic field excited by pulse sound sources holds significant practical value in computational ocean acoustics. Two primary methods exist for modeling underwater propagation time domain: Fourier synthesis technique based on frequency decomposition and time-domain model (TD-UAPM). TD-UAPMs solve wave equation domain without requiring decomposition, providing a more intuitive explanation of physical process energy over time. However, time-stepping numerical can accumulate...
Normal mode models are commonly used to simulate sound propagation problems in horizontally stratified oceanic environments. Although several normal have been developed, the fundamental techniques for accurately and efficiently solving modal equation still under development. Since standard three-point central finite difference scheme (SFD) has a relatively large numerical error, at least twenty sampling grid points per wavelength should be set depth direction. Herein, novel (NFD) is...