Numerical simulation and experimental verification of multi-highlight dual-target acoustic scattering based on...

Area of Science:

• Underwater Acoustics
• Acoustic Scattering Modeling
• Numerical Simulation

Background:

• Gas cylinders are vital acoustic components in underwater diver operations.
• Acoustic scattering from cylinder bodies and edges significantly impacts target detection.
• Accurate modeling is needed for identifying and detecting small underwater targets.

Purpose of the Study:

• To develop a refined model for acoustic scattering from dual gas cylinders.
• To analyze the coupling mechanisms of acoustic scattering from multiple small targets.
• To establish a theoretical framework for predicting multi-target acoustic scattering.

Main Methods:

• A three-dimensional numerical model using the Boundary Element Method (BEM).
• Calculation of full-aspect target strength frequency responses.
• Analysis of scattering mechanisms including energy superposition and interference fringes.
• Full-scale experimental validation in a controlled lake environment.

Main Results:

• The study revealed coupling mechanisms among scattering sources like cylinder bodies, edges, and valve structures.
• Resonant modal features of single gas cylinders were extractable even under dual-target coupling.
• A quantitative relationship between geometric configuration and resonant frequency response was established.
• The proposed coupling mechanism model was validated through full-scale experiments.

Conclusions:

• A theoretical framework for predicting acoustic scattering from multiple small targets was developed.
• The model effectively characterizes multi-target coupling scattering mechanisms in realistic underwater environments.
• The findings enhance the acoustic feature identification and detection of underwater targets.