Acoustic Wave Cloaking via Spatially Periodic Meta-Material
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Solution Overview
Problem
Current meta-material technologies are limited in their ability to cloak acoustic waves, as they primarily focus on electromagnetic waves, and there is no established method to prevent acoustic waves from propagating to specific regions or to make acoustic waves invisible in specific bands.
Innovation Solution
A meta-material with spatially periodic scattering media is used, analogous to a photonic crystal structure, to block or cloak acoustic waves by obtaining target characteristics from a correlation between acoustic and electromagnetic wave mathematical models, allowing for the creation of a meta-material that can surround a region and prevent acoustic waves from propagating, regardless of frequency or velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional meta-material technologies are used, then electromagnetic wave control is achieved, but acoustic wave cloaking capability is not provided
Solution Approach 1:
The patent transforms the electromagnetic wave mathematical model parameters into acoustic wave parameters through correlation mapping. By changing the parameter domain from electromagnetic (permittivity, permeability) to acoustic (density, bulk modulus), the invention enables acoustic wave cloaking while maintaining the theoretical framework's effectiveness
Solution Approach 2:
The patent substitutes the electromagnetic field-based meta-material system with an acoustic field-based system. By replacing electromagnetic wave interaction mechanisms with acoustic wave interaction mechanisms through mathematical model correlation, the invention achieves acoustic wave cloaking functionality
2Reliability
If scattering media are arranged to have spatial periodicity, then acoustic waves in specific bands are blocked, but the device complexity increases
Solution Approach 1:
The patent divides the meta-material into discrete scattering media elements arranged in periodic spatial patterns. By segmenting the continuous material into discrete units with specific spatial periodicity, the invention achieves band-specific acoustic wave blocking while maintaining manufacturability
Solution Approach 2:
The patent assigns different spatial periodicity characteristics to different regions of the meta-material based on the target acoustic wave properties. By optimizing the local spatial arrangement of scattering media, the invention achieves effective acoustic wave blocking in specific frequency bands without requiring complex structures throughout the entire device
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The meta-material effectively blocks acoustic waves in specific bands, allowing for the isolation of noise sources and application in noise mitigation across various geometrical shapes and coordinate systems, including apartment buildings, ships, and submarines.
Implementation Method 1
arranging scattering media, having a predetermined media density, to have spatial periodicity
Implementation Method 2
blocking a region, including a target object, from an acoustic wave by disposing the meta-material
Data Source
AI summary
Disclosed herein are a method and device for cloaking an acoustic wave. A method for cloaking an acoustic wave according to an embodiment of the present invention includes: obtaining a target characteristic of a meta-material based on a correlation between an acoustic propagation mathematical model predetermined for the propagation of an acoustic wave and an electromagnetic wave mathematical model predetermined for an electromagnetic wave; arranging scattering media having a predetermined media density to have spatial periodicity so that the obtained target characteristic is achieved; and blocking a region including a target object from an acoustic wave by disposing the meta-material including the scattering media arranged to have spatial periodicity, to surround the region.