Layered Chamber Acoustic Attenuation for Low-Frequency Noise
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Solution Overview
Problem
Current acoustic attenuation technologies face limitations in effectively attenuating a wide range of low frequencies due to size constraints and the need for large volume or mass systems, which restrict their ability to operate within spatially constrained environments.
Innovation Solution
A layered acoustic attenuator device comprising stacked resonator panels with adjustable openings, where each panel is tuned to a specific frequency range, allowing for efficient attenuation of low frequencies from 10 Hz to 320 Hz by utilizing acoustic chambers with openings that resonate and dissipate acoustic energy, enabling flexible frequency tuning and reduced spatial footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If large volume resonators or large mass systems are used to attenuate low frequencies, then attenuation effectiveness is improved, but spatial footprint increases
Solution Approach 1:
The device divides the acoustic attenuation function into multiple discrete resonator panels stacked in the thickness direction. Each panel contains multiple resonators tuned to different frequency ranges, segmenting the broadband attenuation task into narrower frequency bands that can be handled by compact resonators rather than requiring a single large-volume system.
Solution Approach 2:
The invention transitions from planar resonator arrangements to a three-dimensional stacked configuration of resonator panels. By utilizing the thickness direction for stacking multiple panels with different frequency tunings, the system achieves broadband low-frequency attenuation in a compact footprint that would be impossible with conventional single-plane resonator arrays.
2Adaptability or versatility
If tube resonators with specific lengths are used to target specific frequencies, then frequency selectivity is improved, but spatial constraints limit the achievable frequency range
Solution Approach 1:
The broadband frequency coverage is achieved by segmenting the resonator system into multiple panels, each containing resonators tuned to different frequency ranges. This allows the overall device to cover a broad spectrum (e.g., 10-320 Hz) while each individual resonator maintains a compact length suitable for spatially constrained applications.
Solution Approach 2:
Each resonator panel serves multiple functions by containing resonators tuned to different frequency ranges within the same physical structure. This multi-functionality allows a single panel to contribute to broadband attenuation across multiple frequency bands, maximizing the utility of limited spatial volume.
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 achieves wide-band low-frequency attenuation with improved space efficiency, allowing for effective noise reduction in spatially constrained environments, and provides adjustable frequency tuning capabilities, enhancing attenuation performance and adaptability.
Implementation Method 1
acoustic chambers, each with one or more openings, which act as resonators and allow molecules of a fluid therein to vibrate through the openings
Implementation Method 2
The device can be used to attenuate a wide range of low frequencies
Data Source
AI summary
An acoustic attenuation device includes resonator panels stacked in a thickness direction of the device. Each resonator panel is tuned to a different frequency range and includes a plurality of openings through which excited air resonates. The resonator panels are placed adjacent to other resonator panels such that all openings are accessible to the environment.