Sound Suppression Panel With Vortex Chambers
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Solution Overview
Problem
Existing sound suppression technologies face challenges in minimizing sound wave interference and pressure fluctuations in loudspeaker housings, particularly for low-frequency drivers, and in reducing echo and noise in buildings and near noise sources like motorways, where impermeable walls can reflect sound and incur wind loading.
Innovation Solution
A panel comprising multiple rigid elements with gaps forming vortex chambers, where air flow creates rotational vortices that inhibit sound transmission, with channels aligned tangentially to the vortex chamber to enhance sound attenuation, and optionally featuring secondary vortex chambers and ribs for increased effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If an aperture or port is provided in the enclosure behind the driver, then pressure fluctuations are minimized, but sound wave interference increases
Solution Approach 1:
The enclosure wall is segmented into multiple rigid elements with gaps between them, creating multiple small vortex chambers rather than a single large opening. This segmentation allows pressure equalization while the distributed structure reduces coherent sound wave interference compared to a single port
Solution Approach 2:
The invention converts the harmful sound waves that would emerge through a port into beneficial vortex flow within the vortex chambers. The tangential channels guide sound energy into rotational flow that dissipates acoustically while still providing pressure relief
2Object-generated harmful factors
If impermeable walls are used for sound suppression, then sound transmission is blocked, but sound reflection and wind loading increase
Solution Approach 1:
The wall structure is made porous through the gaps between rigid elements, allowing air permeability that reduces wind loading while the vortex chambers provide acoustic filtering. This porous design blocks sound transmission through vortex-induced flow resistance rather than complete impermeability, reducing both sound reflection and wind pressure
3Stress or pressure
If a large enclosed space is provided behind the driver, then pressure fluctuations are minimized, but the enclosure size increases
Solution Approach 1:
Instead of providing a uniformly large enclosed space, the invention creates localized vortex chambers at specific gaps in the enclosure wall. These localized structures provide pressure relief functionality without requiring a large overall enclosure volume, as the vortex chambers are distributed throughout the wall structure
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 panel significantly reduces sound intensity transmission and reflection, providing effective sound suppression by utilizing vortex flow paths to attenuate sound waves, with varying vortex chamber dimensions enhancing suppression at specific wavelengths.
Implementation Method 1
within each gap a vortex chamber is defined to attenuate acoustic waves. The overlapping edge portions of adjacent elements defining between them the vortex chamber, and also defining a first channel and a second channel communicating with the vortex chamber... such that if a fluid were to flow in through the first channel or in through the second channel the fluid would enter the vortex chamber with a rotational sense relative to the vortex chamber, the rotational sense being the same for the first channel and the second channel, so that the flowing fluid would tend to form a vortex in the vortex chamber
Data Source
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Figure 7~10
AI summary
A panel (10) for sound suppression consists of a multiplicity of rigid elements (12) that extend parallel to each other, with gaps between adjacent rigid elements. Within each gap a vortex chamber (15) is defined to attenuate acoustic waves. The elements (12) may have curved edge portions (14), the edge portions (14) of adjacent elements (12) overlapping to define the vortex chamber (15), and also defining a first channel (16a) and a second channel (16b) communicating with the vortex chamber (15) at its periphery and aligned with a tangential component, such that if a fluid were to flow in through either channel (16a or 16b) the fluid would enter the vortex chamber (15) with a rotational sense relative to the vortex chamber (15), the rotational sense being the same for both the channels (16a, 16b). Such a sound-attenuating panel may for example be used as part of a wall of a loudspeaker housing (50).