Scale-model evaluation of the performance of suspended baffle arrays in typical factory sound fields


  • M. Hodgson Dept. of Mech. Eng., British Columbia Univ., Vancouver, BC, Canada


acoustic noise, acoustic wave absorption, noise abatement, industrial buildings, baffles, sound-absorptive material, absorption coefficient, reverberation rooms, diffuse sound field, surface absorption, ray-tracing model


Sound fields in industrial buildings are often controlled by the installation of arrays of baffles (rectangular pieces of sound-absorptive material) suspended from the building roof. Several researchers have measured the performance, in particular the absorption coefficient, of baffle arrays in reverberation rooms-that is, in a diffuse sound field. Unfortunately, the sound fields in most industrial buildings are non-diffuse for reasons related to the room shape, surface absorption and the presence of fittings (machines, stockpiles and other obstacles in the room). The performance of absorptive materials in a non-diffuse sound field may be very different from that in a diffuse sound field. In order to determine the performance of baffles in non-diffuse fields such as those found in typical factories, reverberation times and steady-state sound pressure levels were measured in a 1:8 scale model with variable dimensions, and containing various arrays of baffles. The experimental results were then predicted using a ray-tracing model, with the input parameters describing the baffle array varied in order to obtain a best fit. The results for the preliminary series of tests are described and summarized, with emphasis on the experimental work



How to Cite

Hodgson M. Scale-model evaluation of the performance of suspended baffle arrays in typical factory sound fields. Canadian Acoustics [Internet]. 1992Sep.1 [cited 2021Apr.17];20(3):19-20. Available from:



Proceedings of the Acoustics Week in Canada