Flexural Wave Bandpass Filtering With Resonator Arrays
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Solution Overview
Problem
Existing systems struggle to effectively filter out non-target flexural waves while allowing target waves to pass through structures, leading to potential damage and noise generation due to the inherent limitations of mechanical resonators, which result in leakage damping and limited quality factors.
Innovation Solution
An absorption system utilizing at least two mechanical resonators spaced at a distance greater than 0.45λ, aligned in a linear array, operates in an embedded state with an infinite Q factor, allowing target flexural waves to pass while reflecting or absorbing non-target waves, achieving a narrow bandpass filtering effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high strength-to-mass materials are used in structures, then weight is reduced and strength is improved, but the structure becomes more susceptible to flexural wave transmission causing damage and noise
Solution Approach 1:
The patent introduces mechanical resonators as intermediary elements coupled to the high strength-to-mass material structure. These resonators act as mediators that selectively interact with flexural waves, absorbing target frequency waves while allowing non-target waves to pass through, thereby protecting the structure from harmful flexural wave effects without compromising the inherent strength benefits of the high strength-to-mass material.
Solution Approach 2:
The patent applies local quality by positioning mechanical resonators at specific locations and orientations on the structure surface. Each resonator is configured with specific mechanical properties (mass, stiffness, damping) tailored to target particular frequency ranges. This localized customization allows different regions of the structure to handle different frequency components of flexural waves, optimizing protection while maintaining overall structural integrity.
2Object-affected harmful factors
If traditional resonators are used to absorb flexural waves, then wave absorption is achieved, but the resonators either absorb or reflect all waves without selective filtering
Solution Approach 1:
The patent segments the wave absorption function by using multiple mechanical resonators with different resonant frequencies arranged in an array. Each resonator segment targets a specific frequency band, creating a distributed filtering system. This segmentation allows the overall system to selectively absorb only target frequency waves while permitting non-target frequency waves to pass through, achieving frequency-selective absorption that traditional single-resonator systems cannot provide.
Solution Approach 2:
The patent employs dynamic tuning capabilities where the mechanical resonators can be adjusted or configured to change their resonant frequencies. This dynamic property allows the filtering system to adapt to different target frequency requirements, enhancing versatility. The resonators' dynamic response characteristics enable precise control over which frequency components are absorbed versus transmitted, providing adaptable frequency selectivity.
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 system efficiently filters non-target flexural waves while transmitting target waves, enhancing structural integrity and reducing noise, suitable for applications in signal processing and sensing devices.
Implementation Method 1
a resonator attached to the structure absorbs the flexural waves, thus negating the adverse effects of the propagating wave
Implementation Method 2
reflecting a non-target flexural wave that propagates through the longitudinally extending body
Data Source
AI summary
System, methods, and other embodiments described herein relate to absorbing flexural waves. In one embodiment, a system includes a longitudinally extending body that is subject to a flexural wave and a bandpass filter. The bandpass filter transmits a target flexural wave having a particular wavelength and blocks a non-target flexural wave. The bandpass filter includes at least two mechanical resonators coupled to a surface of the longitudinally extending body and aligned in a first linear array along a length dimension of the longitudinally extending body. The at least two mechanical resonators of the first linear array are separated by a distance based on the particular wavelength.