NOISE BARRIER DESIGN BASED ON A COMBINATION OF MOSS AND SONIC CRYSTAL

• Main Author: Farizka Anugrah, Priananda
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/83695
• Institution: Institut Teknologi Bandung

Urban development and design are essential for ensuring the sustainability of life. One of the primary goals of urban planning is to achieve environmental balance. However, urban areas are often characterized as metropolitan regions with high population densities and heavy traffic. These conditions contribute to noise pollution, which has negative impacts on public health and quality of life. Sonic crystals are known for their effectiveness in blocking sound waves, particularly traffic noise, while vegetation has been traditionally used to combat air pollution. These two methods have been independently employed to address their respective challenges. However, this study aims to combine a noise barrier system based on moss and sonic crystals to reduce noise and improve air quality. The research methods include the characterization of moss using an impedance tube, numerical modeling and simulation of both sonic crystals and moss, and validation of acoustic performance through experimental measurements. The results indicate that moss, as a supporting element of the system, exhibits acoustic performance in absorbing sound waves. Moss achieved a good absorption coefficient of 0.3 at 1000 Hz and 0.6 at 1700 Hz. Furthermore, numerical calculations provided positive results, with a band gap transmission loss of 8 dB at 1000 Hz when the sonic crystal system had a diameter of 3 inches and a lattice spacing of 15 cm. The transmission loss increased to 10 dB at 1000 Hz when the system combined sonic crystals with moss. In experimental testing of the noise barrier system, the results differed from the numerical calculations due to a less precise definition of the band gap. The sonic crystal system alone achieved a transmission loss of approximately 5 dB at frequencies between 1000 Hz and 5000 Hz. In contrast, the system combining sonic crystals and moss showed a transmission loss of 8 dB at 1000 Hz, which increased to 20 dB at 4000 Hz. Overall, the noise barrier system based on the combination of moss and sonic crystals has been shown to be effective in reducing noise, particularly traffic noise. Keywords: Traffic Noise, Moss, Sonic Crystal, Noise Barrier.?