Acoustic Meta Atom with Segmented Resonators for Independent Wave Control
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Solution Overview
Problem
Conventional research on metamaterials has primarily focused on electromagnetic wave parameters, with little attention given to acoustic metamaterials, and existing metamaterial structures face challenges in independently controlling wave parameters and bianisotropy, requiring trial-and-error approaches due to interconnected resonant modes.
Innovation Solution
The development of meta atoms comprising a first resonator assembly and a second resonator assembly, with partitions connecting them, allows for independent control of acoustic wave parameters such as mass density and bulk modulus, and the introduction of bianisotropy through asymmetric resonance characteristics and fluid properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional metamaterial structures are used to adjust wave parameters, then one wave parameter can be adjusted, but variations of other wave parameters are inevitable
Solution Approach 1:
The patent divides the resonator system into two independent assemblies: a first resonator assembly for controlling one wave parameter and a second resonator assembly for controlling another wave parameter. This segmentation allows each assembly to independently adjust specific parameters without causing unwanted variations in other parameters, resolving the technical contradiction between parameter control precision and independent parameter control.
Solution Approach 2:
The patent introduces partitions as intermediary elements that connect the first and second resonator assemblies while preventing unwanted coupling between them. These partitions act as mediators that allow the assemblies to work independently, enabling precise control of individual wave parameters without affecting other parameters.
2Manufacturing precision
If trial and error approach is used to design metamaterial structures, then desired wave parameters can be achieved, but design time and complexity increase significantly
Solution Approach 1:
By segmenting the design into two independent resonator assemblies with clearly defined functions, the patent eliminates the need for iterative trial-and-error testing of the entire structure. Each assembly can be designed and optimized independently based on target parameter requirements, significantly reducing design time while maintaining manufacturing precision.
Solution Approach 2:
The patent enables preliminary design of each resonator assembly based on desired wave parameters before final assembly. The first resonator assembly can be pre-designed for one parameter range while the second assembly is pre-designed for another parameter range, allowing parallel development and reducing overall design time.
3Adaptability or versatility
If existing metamaterial structures are used, then material parameters can be changed, but bianisotropy cannot be independently controlled
Solution Approach 1:
The patent introduces asymmetric resonance characteristics in the resonator assemblies to achieve bianisotropy. By making the resonators asymmetric in their resonance properties rather than in their geometric shapes, the patent enables independent control of bianisotropy while maintaining relatively simple structural forms, resolving the contradiction between adaptability and device complexity.
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
Enables precise control of acoustic wave parameters and bianisotropy, facilitating the design of acoustic metamaterials that can manipulate wave parameters from negative to positive ranges, and achieve efficient impedance matching and phase modulation in acoustic metasurfaces.
Implementation Method 1
a first resonator assembly having a pair of resonators configured of two resonators disposed apart from each other with respect to an axis direction; a second resonator assembly positioned inside the pair of resonators included in the first resonator assembly, and having at least one resonator
Implementation Method 2
partitions connected between the first resonator assembly and the second resonator assembly, and supporting the first and second resonator assemblies
Data Source
AI summary
A meta atom for controlling acoustic parameters and metamaterials comprising the same, which includes a first resonator assembly having a pair of resonators configured of two resonators disposed apart from each other with respect to an axis direction; a second resonator assembly positioned inside the pair of resonators included in the first resonator assembly, and having at least one resonator; and partitions connected between the first resonator assembly and the second resonator assembly, and supporting the first and second resonator assembly.