Abstract
Reverberation time (RT) is an important factor affecting the quality of indoor acoustics. Using sound-absorbing materials is one method for quickly and effectively controlling RT, and installation in the ceiling is a common location. Sound-absorbing ceilings come in many forms, with light steel joist ceilings commonly used in office spaces, classrooms, and discussion rooms. Light steel joist ceilings are often matched with sound-absorbing materials such as gypsum board, mineral fiberboard, rock wool, and coated glass wool, but such materials may have durability and exfoliation problems. Therefore, considering performance and health, in this research, we aimed to design an expanded metal mesh (EMM) structure specimen for sound-absorption material, namely folded expanded metal mesh (FEMM). The results show that the FEMM can significantly improve the sound-absorption performance of the expanded metal mesh. The Math output errorαw of single panel is 0.05–0.35, and the Math output errorαw of FEMM is 0.65–0.85. On the other hand, the sound-absorption performance of the full frequency band has been significantly improved. Furthermore, the field validation result shows that RT decreased from 1.05–0.56 s at 500 Hz, meanwhile, the sound pressure level (SPL) is still evenly distributed, and speech clarity (C50) is increased by 5.6–6.5.
Highlights
In acoustics, mastering reverberation time (RT) is an important item for creating a great indoor acoustic environment, and one of the common control methods is to use a soundabsorbing ceiling
We focused on the acoustic resonance structure of the metal panel based on the manufacturing cost; the object in this study is expanded metal mesh (EMM) with a lower cost
In order to obtain higher sound-absorbing performance while considering the structure of the material, this research proposed sound-absorption structures composed of EMM based on the height of the specimen, the thickness of the cavity, and the folded shape, followed by the development of the folded expanded metal mesh (FEMM)
Summary
In acoustics, mastering reverberation time (RT) is an important item for creating a great indoor acoustic environment, and one of the common control methods is to use a soundabsorbing ceiling. Common sound-absorbing materials used with light steel joist ceilings include gypsum board, mineral fiberboard, rock wool board, calcium silicate board, and covered glass wool, all of which perform well with sound-absorbing ability and are easy to obtain These materials can become warped, deformed, grow fungus, or peel off and may even cause air pollution that affects the health of users due to various environments and times [1]. In order to obtain higher sound-absorbing performance while considering the structure of the material, this research proposed sound-absorption structures composed of EMM based on the height of the specimen, the thickness of the cavity, and the folded shape, followed by the development of the folded expanded metal mesh (FEMM).
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