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Acoustic metamaterial noise control method and apparatus for ducted systems

An acoustic metamaterial and noise control technology, applied in the fields of noise suppression, heating methods, sound-emitting devices, etc., can solve problems such as distracting occupants, generating noise, and destroying the quality of life in buildings

Inactive Publication Date: 2018-12-21
ACOUSTIC METAMATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, such systems tend to create noise and disrupt the building's quality of life, while distracting occupants

Method used

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  • Acoustic metamaterial noise control method and apparatus for ducted systems
  • Acoustic metamaterial noise control method and apparatus for ducted systems
  • Acoustic metamaterial noise control method and apparatus for ducted systems

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Embodiment Construction

[0018] The acoustic metamaterial noise control system of embodiments of the disclosed technology combines absorbent materials with the principles of acoustic metamaterials to significantly reduce acoustic radiation in or from HVAC ducts. A sound wave hitting the noise control system at the end of the pipe causes the sound wave to reflect back to the start of the noise control system and be absorbed by the sound wave in the absorbing core. This is achieved by using micro-perforated panels (MPP) to absorb sound. For the purposes of this disclosure, an MPP is defined as a device for absorbing and reducing sound intensity consisting of or consisting of a thin flat plate less than or equal to 2 mm thick, with holes between 0.1 mm and 0.4 mm in diameter.

[0019] The perforations in the acoustic metamaterial provide the acoustic metamaterial anisotropy (direction dependence) characteristic of the material core. By using the principles of acoustic metamaterials, noise control system...

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PUM

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Abstract

An acoustic metamaterial noise control system of embodiments of the disclosed technology combines acoustic metamaterial principles with absorptive materials, with a result of a significant reduction in sound radiation within, or emanating from, an HVAC duct. Sound waves that impinge on the noise control system placed at the end (terminal opening of an air duct to ambient space within a room / building), or at a predetermined place on the duct, cause the sound waves to reflect back to the start of the noise control system and also to be absorbed by sound waves within the absorptive core. This isaccomplished by way of the use of micro-perforated panels (MPPs) placed in periodic manner with absorptive layers and air gaps to achieve anisotropic conditions to reflect and absorb sound waves for optimum sound reduction.

Description

technical field [0001] The present disclosure relates generally to noise reduction from pipes, and more particularly to the use of acoustic metamaterials in connection with such noise reduction. Background technique [0002] HVAC (heat, ventilating, and air conditioning) systems typically use a series of ducts through which hot or cold air passes to heat or cool a building. Traditionally, HVAC ductwork is made of sheet metal, which is first installed and then wrapped with insulation as a secondary operation. Galvanized mild steel is the standard and most commonly used material for the manufacture of piping systems. Steel plate is usually supplied in continuous sheet metal coils with standard widths of 1.20 to 1.50 metres. The coils are manually unrolled and cut to length. The lengths are then bent together into a rectangular shape and locked together. Currently available flexible ducts (called flexes) come in a variety of configurations, but for HVAC applications they ar...

Claims

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Application Information

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IPC IPC(8): F24F13/24G10K11/168G10K11/172
CPCG10K11/172F24F13/24G10K11/161G10K11/168F24F2013/245F24F2013/242
Inventor G·马瑟
Owner ACOUSTIC METAMATERIALS
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