Abstract
Nowadays, thermally active concrete ceilings are frequently used in new buildings due to the requirement of thermal comfort and energy saving. But architectural design requires for planar surfaces so that the sound absorbers should not be installed below the ceiling even for guaranteeing the thermal efficiency. Thus a periodic arrangement of sound-absorbent strips or patches in concrete ceilings will be a good solution to this problem. The sound absorption of these two structures will be introduced in this report. Furthermore, a periodically uneven surface with rectangular profile is also commonly used at present, for example, as wooden floor. The sound absorbers can be hided in the grooves to control the acoustic environment. This configuration satisfies people's requirement of seeing the wood ceiling. The sound absorption of this groove structure will be introduced in this report as well. Besides, a parametric survey has been down on the performance of the periodically groove structure and porous absorber. Based on this survey, optimized examples for application are suggested.
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