Integrated Broadband Acoustic Attenuator Design
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Solution Overview
Problem
Current acoustic attenuation technologies face limitations in effectively addressing both low and high frequency noise due to size constraints and the need for multiple resonators with varying lengths, which increases complexity and cost.
Innovation Solution
An integrated, tunable acoustic attenuator assembly that combines low frequency sound attenuation devices with acoustic chambers and high frequency sound attenuation devices featuring sound-absorbing projections, allowing for adjustable openings and frequency tuning mechanisms to cover a broad range of frequencies without requiring extensive length adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple resonators with varying lengths are used to achieve broadband attenuation, then the frequency range is improved, but the device complexity and size increase
Solution Approach 1:
The patent combines low frequency attenuation (via resonant chambers) and high frequency attenuation (via sound absorbing material) into a single integrated device. Multiple functions are merged into one unit, eliminating the need for separate resonators for different frequency ranges, thus reducing device complexity while maintaining broadband capability
Solution Approach 2:
The integrated attenuator device performs multiple functions simultaneously: it attenuates both low frequency noise through resonant chambers and high frequency noise through sound absorbing projections. This multi-functional design allows a single device to cover a broad frequency spectrum without requiring multiple specialized components
2Adaptability or versatility
If resonator chamber length is adjusted to tune frequency, then the frequency coverage is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies different structural solutions to different frequency ranges within the same device: resonant chambers with specific geometries for low frequency attenuation and sound absorbing projections for high frequency attenuation. This localized approach allows frequency tuning through geometric design rather than complex length adjustments, simplifying manufacturing while maintaining frequency adaptability
Solution Approach 2:
The patent achieves frequency tuning by changing geometric parameters of the resonant chambers (such as chamber volume, opening area, and shape) rather than adjusting chamber lengths. This approach to parameter optimization allows for standardized manufacturing processes while still enabling frequency customization through design variations
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 solution provides efficient broadband acoustic attenuation by dissipating low frequency noise through resonant chambers and absorbing high frequency noise, reducing complexity and cost while allowing for post-manufacturing frequency adjustments, thus enhancing flexibility and effectiveness.
Implementation Method 1
A low frequency sound attenuation device can include at least one sound attenuation chamber through which excited air resonates
Implementation Method 2
A high frequency sound attenuation device can include projections formed from a sound absorbing material that absorbs excited air
Data Source
AI summary
An acoustic attenuation assembly includes a low frequency sound attenuation device having at least one sound attenuation chamber containing a volume and mass of air. First and second openings are associated with each low frequency chamber through which excited air resonates. The first and second openings extend through the first sheet into each low frequency chamber. Each chamber has an open side. A high frequency sound attenuation device is secured to the low frequency attenuation device and closes the open side of each chamber. The high frequency sound attenuation device includes a plurality of projections formed from a sound absorbing material that absorbs excited air.