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Noise reduction using coffered ceiling models.
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A scale (1 ft=1 m) model of a German coffered ceiling [E. Buchta, ‘‘Noise Control Study of a Light and Air Permeable Coffered Ceiling at an MG-Range in Northeim,’’ Institute for Noise Control, Dusseldorf, Germany (1985)] and three variations were designed, built, and tested at CERL. To measure the efficiency of these ceilings, a scale representation of the spectral range for small arms fire was radiated through the suspended models. The noise reduction measured for these models is compared to theoretical design curves calculated by Cremer [L. Beranek, NoiseandVibrationControl (Inst. of Noise Control Eng., Washington, DC, 1988)] for attenuation in lined ducts. When the ceilings are considered to be arrays of short lined ducts, Cremer’s theory predicts the experimental noise reduction. Attenuation is found to be linearly dependent on the depth of the ceiling. In order to attenuate lower frequencies, the spacing between baffles must be increased. Therefore, size constraints will determine a lower bound on frequencies effectively attenuated by such ceilings.
Acoustical Society of America (ASA)
Title: Noise reduction using coffered ceiling models.
Description:
A scale (1 ft=1 m) model of a German coffered ceiling [E.
Buchta, ‘‘Noise Control Study of a Light and Air Permeable Coffered Ceiling at an MG-Range in Northeim,’’ Institute for Noise Control, Dusseldorf, Germany (1985)] and three variations were designed, built, and tested at CERL.
To measure the efficiency of these ceilings, a scale representation of the spectral range for small arms fire was radiated through the suspended models.
The noise reduction measured for these models is compared to theoretical design curves calculated by Cremer [L.
Beranek, NoiseandVibrationControl (Inst.
of Noise Control Eng.
, Washington, DC, 1988)] for attenuation in lined ducts.
When the ceilings are considered to be arrays of short lined ducts, Cremer’s theory predicts the experimental noise reduction.
Attenuation is found to be linearly dependent on the depth of the ceiling.
In order to attenuate lower frequencies, the spacing between baffles must be increased.
Therefore, size constraints will determine a lower bound on frequencies effectively attenuated by such ceilings.
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