Flexural Wave Absorbers Using Coupled Resonators
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Solution Overview
Problem
Traditional solutions for absorbing flexural waves in thin wall structures often reduce bending stiffness and add mass, while failing to effectively absorb low-frequency flexural waves across broad frequency domains.
Innovation Solution
The use of metasurfaces with inner and outer portions and beam strips, where coupled resonators, including lossy and lossless resonators, are disposed on the beam strips to absorb flexural waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional dampening materials or nonlinear materials are used to absorb flexural waves, then wave absorption is improved, but bending stiffness is reduced and mass is added
Solution Approach 1:
The patent changes the physical parameters of the structure by introducing resonators with specific natural frequencies that match target flexural wave frequencies. These resonators are designed with precise mass, stiffness, and damping parameters to achieve frequency-selective absorption without compromising overall structural bending stiffness. The resonators are coupled to the beam strips in a way that locally modifies vibration characteristics only at resonant frequencies.
Solution Approach 2:
The patent employs a composite structure combining beam strips with attached resonators (including membrane resonators and plate resonators). This composite configuration allows the system to exhibit both the structural integrity of the beam strips and the frequency-selective absorption characteristics of the resonators, achieving wave absorption without significant mass addition or stiffness reduction.
2Object-affected harmful factors
If traditional dampening materials or nonlinear materials are used to absorb flexural waves, then wave absorption is improved, but mass is added to the structure
Solution Approach 1:
The patent achieves frequency-selective absorption by carefully designing resonator parameters (mass, stiffness, damping) rather than using bulky dampening materials. The resonators are optimized to provide maximum absorption at specific frequencies with minimal mass, leveraging resonance phenomena to amplify the absorption effect of small mass additions.
Solution Approach 2:
The resonators are strategically placed at specific locations along the beam strips where flexural waves exhibit particular characteristics. This localized approach concentrates absorption functionality only where needed, avoiding unnecessary mass addition across the entire structure. The resonators target specific frequency ranges, providing local quality enhancement rather than uniform mass distribution.
3Object-affected harmful factors
If traditional dampening materials or nonlinear materials are used, then some frequency ranges are absorbed, but low frequency flexural waves are not absorbed
Solution Approach 1:
The patent designs resonators with natural frequencies specifically tuned to low frequency flexural wave ranges. By adjusting resonator mass, stiffness, and coupling characteristics, the system achieves absorption at low frequencies where traditional dampening materials are ineffective. Multiple resonators with different natural frequencies can be deployed to cover broad frequency domains including low frequencies.
Solution Approach 2:
The resonators are designed to dynamically respond to incoming flexural waves by vibrating at their natural frequencies, which are matched to target wave frequencies including low frequencies. This dynamic resonance mechanism allows the system to adaptively absorb waves across different frequency ranges, particularly low frequencies, by activating the appropriate resonator modes.
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
This configuration effectively absorbs flexural waves across a range of frequencies, minimizing vibration and noise transmission without compromising the structural integrity or adding excessive mass.
Implementation Method 1
coupled resonators are disposed on the beam strips to absorb flexural waves
Implementation Method 2
flexural waves, also known as bending waves, propagating across a surface of structure and deforming the structure transversely to the surface
Implementation Method 3
The metasurface also includes a lossy resonator and a lossless resonator disposed on each of the plurality of beam strips
Data Source
AI summary
A flexural wave absorber includes a metasurface with an inner portion, an outer portion, and a plurality of beam strips extending between the inner portion and the outer portion. The metasurface also includes a plurality of coupled resonators disposed on the plurality of beam strips. The plurality of coupled resonators can include a lossy resonator and a lossless resonator, two lossy resonators and a lossless resonator, or a lossy resonator and two lossless resonators. In addition, each of the plurality of beam strips can have multiple pairs of coupled resonators disposed thereon that work at or absorb different frequency ranges.