Acoustic Black Hole Structural Dampers With Reinforced Tips
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Solution Overview
Problem
Conventional acoustic black holes (ABHs) have weak tips that fatigue over time due to vibrations, leading to potential breakage and limited applications in non-planar structures, and manufacturing challenges exist in achieving zero thickness tips.
Innovation Solution
The ABH is designed with regions of different spatial properties, such as increased thickness or curvature, at outer edges or in material properties, to enhance fatigue resistance and maintain the acoustic black hole effect, using additive manufacturing for structural damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tip of the ABH reduces to zero thickness to achieve ideal wave attenuation, then the wave reflection is minimized and damping performance is improved, but the structural strength is reduced and fatigue resistance deteriorates
Solution Approach 1:
The patent applies local quality by creating regions of different spatial properties within the ABH structure. Specifically, it introduces regions with increased thickness or different curvature at critical locations (such as the tip or outer edges) to enhance local strength and fatigue resistance while maintaining the overall tapering profile necessary for wave attenuation. This allows the structure to have both good damping performance and improved structural integrity.
Solution Approach 2:
The patent employs composite materials by combining different spatial property regions within the ABH. It integrates regions with varying thickness, curvature, or material properties to create a composite structure that simultaneously achieves wave attenuation and enhanced fatigue resistance. This composite approach allows optimization of both damping performance and structural strength.
2Reliability
If the tip thickness is reduced to achieve acoustic black hole effect, then wave speed decreases and reflection is minimized, but manufacturing precision becomes more difficult to achieve
Solution Approach 1:
The patent applies partial action by not reducing the tip thickness to zero, but rather to a small finite value or by introducing regions of increased thickness at the tip. This partial approach to achieving the ABH effect (not going to the theoretical limit of zero thickness) makes manufacturing more feasible while still providing sufficient wave attenuation and reflection minimization.
Solution Approach 2:
The patent uses local quality by introducing regions of different spatial properties at specific locations. Instead of uniformly reducing the entire ABH tip to zero thickness, it creates localized regions with increased thickness or different curvature at the tip or outer edges, making manufacturing more precise and feasible while maintaining the acoustic black hole effect in the critical wave propagation regions.
3Adaptability or versatility
If conventional ABH design is used in non-planar structures, then application versatility is improved, but the structural integrity and fatigue resistance deteriorate
Solution Approach 1:
The patent applies local quality by creating regions of different spatial properties at specific locations within the ABH. When applied to non-planar structures, it introduces regions with increased thickness or different curvature at critical stress locations to enhance local fatigue resistance while maintaining the overall ABH profile necessary for wave attenuation and structural versatility.
Solution Approach 2:
The patent employs composite materials by integrating regions with varying spatial properties into the ABH structure. This composite approach allows the structure to be adapted to non-planar geometries while maintaining structural integrity and fatigue resistance through the combined properties of different regions.
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 modified ABH exhibits improved fatigue resistance and maintains wave attenuation performance, extending its functional life and enabling application in various structures beyond planar forms.
Implementation Method 1
The acoustic black hole effect is typically achieved by introducing a power law taper into a beam or plate that changes the thickness over a set distance. This change in thickness profile causes the flexural waves propagating along the direction of the ABH to decrease in wave speed.
Implementation Method 2
An acoustic black hole was originally described by Mironov in 1988... provides examples of different types of 'one-dimensional' acoustic black holes... The ABH effect can also be achieved using other gradient functions, including a power-cosine curve, for example.
Data Source
AI summary
There is provided an acoustic black hole comprising: in a first axis, along a line, a variation from a first characteristic to a second characteristic to a third characteristic, wherein the acoustic black hole comprises a taper from the first characteristic to the third characteristic, and wherein the second characteristic is a deviation from the taper.