Noise Reduction Using An Air-Permeable Ceiling
Abstract
A scaled (1 ft = 1 m) model of a German coffered ceiling and three variations were designed, built, and tested at Construction Engineering Research Laboratory in Champaign, II. To measure the efficiency of these ceilings, a scaled 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 in Beranek 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1992
- Accession Number
- ADA381749
Entities
People
- Wayne H. Bradley
Organizations
- University of Illinois Urbana–Champaign