Fabric Layer Acoustic Resonator for Broadband Absorption
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Solution Overview
Problem
Existing sound absorbing devices using acoustic resonators are cost and structurally prohibitive for broadband acoustic absorption, as they are designed for specific frequency ranges and require multiple resonators of different sizes.
Innovation Solution
A sound absorbing device with a chamber and at least one fabric layer extending across the opening, where the fabric layers are configured to move relative to each other, adjusting the range of acoustic frequencies absorbed, and can include multiple fabric layers with varying pore sizes and elasticity to enhance acoustic absorption across a broader frequency range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple acoustic resonators of different sizes are used for broadband acoustic absorption, then the frequency absorption range is improved, but the device complexity and cost increase
Solution Approach 1:
The patent combines multiple fabric layers with different pore sizes into a single integrated structure that covers the opening of a single acoustic resonator chamber. This merging approach allows the system to absorb multiple frequency ranges simultaneously without requiring multiple separate resonators, thereby reducing structural complexity while maintaining broadband absorption capability.
Solution Approach 2:
The fabric layers serve multiple functions: they act as acoustic absorption elements, provide frequency tuning mechanisms, and can be configured in various arrangements (stacked contact, spaced apart, elastic) to address different acoustic requirements. This multi-functionality allows a single resonator structure to handle broadband absorption that would traditionally require multiple specialized resonators.
2Adaptability or versatility
If multiple acoustic resonators of different sizes are used for broadband acoustic absorption, then the frequency absorption range is improved, but the cost increases
Solution Approach 1:
The patent merges the function of multiple resonators into a single chamber by placing multiple fabric layers over its opening. This reduces the number of separate components that need to be manufactured and assembled, thereby lowering manufacturing costs while achieving broadband absorption across multiple frequency ranges.
Solution Approach 2:
The patent achieves frequency range adjustment by changing the parameters of the fabric layers (pore size, material composition, spacing, elasticity) rather than changing the physical size of multiple resonator chambers. This parameter-based tuning is more cost-effective as it involves modifying properties of existing components rather than manufacturing additional resonators of different dimensions.
3Adaptability or versatility
If fabric layers are configured to move relative to each other for adjustable frequency absorption, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The patent incorporates movable fabric layers that can change their relative positions or configurations to dynamically adjust the acoustic absorption characteristics. This dynamic capability allows the system to adapt to different frequency requirements without requiring complex mechanical actuation systems, as the movement can be achieved through simple elastic deformation or repositioning of the fabric layers.
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 device effectively absorbs a broad range of acoustic frequencies by converting acoustic energy into heat, offering a cost-effective and efficient solution compared to traditional acoustic resonators, with adjustable fabric configurations to optimize absorption characteristics.
Implementation Method 1
The at least one fabric layer extending across the opening is at least one of at least two fabric layers stacked relative to and in direct contact with each other, at least two fabric layers stacked relative to and spaced apart from each other by a predefined distance, at least one elastic fabric layer configured to vibrate independently from the chamber, and a three dimensional fabric layer with pores having a depth to diameter ratio of at least 100:1
Implementation Method 2
at least one elastic fabric layer configured to vibrate independently from the chamber
Implementation Method 3
Acoustic resonators, e.g., Helmholtz resonators and quarter-wave tubes, are used for acoustic absorption of specific frequency ranges
Data Source
AI summary
A sound absorbing device includes a chamber with an opening and at least one fabric layer extending across the opening. The at least one fabric layer extending across the opening is at least two fabric layers stacked relative to and in direct contact with each other, at least two fabric layers stacked relative to and spaced apart from each other by a predefined distance, at least one elastic fabric layer configured to vibrate independently from the chamber, or a three dimensional fabric layer. The at least two fabric layers stacked relative to and in direct contact with each other and the at least two fabric layers stacked relative to and spaced apart from each other by a predefined distance are configured to move relative to each other, and the at least one elastic fabric layer is configured to vibrate independently from the chamber.