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A sound attenuator, or duct silencer, sound trap, or muffler, is a noise control acoustical treatment of Heating Ventilating and Air-Conditioning (HVAC) ductwork designed to reduce transmission of noise through the ductwork, either from equipment into occupied spaces in a building, or between occupied spaces.
The attenuator is a specialty duct accessory that typically consists of an inner perforated baffle with sound-absorptive insulation. Sound attenuators may take the place of ductwork; conversely, inline attenuators are located close to the blower and have a bellmouth profile to minimize system effects.
Transmission loss (TL) in duct acoustics is defined as the difference between the power incident on a duct acoustic device and that transmitted downstream into an anechoic termination. Transmission loss is independent of the source, [ 1 ] [ 2 ] if only plane waves are incident at the inlet of the device. [ 2 ]
An acoustic transmission line is the use of a long duct, which acts as an acoustic waveguide and is used to produce or transmit sound in an undistorted manner. Technically it is the acoustic analog of the electrical transmission line , typically conceived as a rigid-walled duct or tube, that is long and thin relative to the wavelength of sound ...
It depends on the cross-sectional area and length of the line, the sound frequency, as well as the characteristic impedance of the sound propagating medium within the duct. Only in the exceptional case of a closed end tube (to be compared with electrical short circuit), the input impedance could be regarded as a component impedance.
A noise-cancellation speaker emits a sound wave with the same amplitude but with an inverted phase (also known as antiphase) relative to the original sound. The waves combine to form a new wave, in a process called interference , and effectively cancel each other out – an effect which is called destructive interference .
Learn more in our guide to guest drivers and car insurance. Sources Inflation, High Interest Rates, and Catastrophes Contribute to 2023 Underwriting Loss for P&C Industry, New Triple-I/Milliman ...
421.2 Flutes with duct or duct flutes - A narrow duct directs the air-stream against the sharp edge of a lateral orifice 421.21 Flutes with external duct - The duct is outside the wall of the flute; this group includes flutes with the duct chambered in the wall under a ring-like sleeve and other similar arrangements.
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