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Reducing Noised – The Impact of Biocomposite Noise Dampers with Grinting Grass (Cynodon dactylon) on Noise Intensity

Rinawati Seviana, Khusaini Muh., Ciptadi Gatot, Handayani Dian

Ecological Engineering & Environmental Technology

2024

Vol. 25, iss. 12

346--355

The use of machines and technology in the industrial sector has led to noise pollution, which requires attention. The practice of noise control through soundproofing is closely linked to the use of various acoustic materials, whether they are synthetic or natural fibers. Natural materials are preferred for biocomposite reinforcement due to the design flexibility, eco-friendliness, sustainability, and ease of availability. Therefore, this research aimed to analyze the variation of grinting grass (Cynodon dactylon) composite material as damper with safe working distance from noise exposure. This experimental research was conducted using industrial grinding machine and damper from grinting grass as the object and composite material. The instruments used for measurement included an Impedance tube (sound absorption coefficient), a sound level meter (noise intensity), and a Surfer 13 noise mapping application. The data obtained were analyzed using the Wilcoxon test to determine the differences before and after the intervention. The results showed that the most effective composite had a 60:40 ratio with a sound absorption coefficient of 0.30. Before using damper, the highest noise intensity recorded was 106 dBA, which was reduced to 83 dBA. Safe working distance from exposure before damper was 6.1 meters, which decreased to 1 meter after the intervention. In conclusion, there was a significant difference in noise intensity (p = 0.000) and safe working distance from exposure (p = 0.001) before and after the use of grinting grass as damper.