Penelitian Sifat-Sifat Akustik Dari Bahan Kertas Dan Plastik Sebagai Penghalang Kebisingan

ABSTRAK The goal of this research is to determine acoustic properties of alternative materials used to replace plants as noise barrier. The materials investigated are paper and plastic because these materials can also he used inside a room or as room partition. The flow resistivity of materials are measured, and then used as a room partition in a semi anechoic room. A sound source was then tuned and the Sound Pressure Level (SPL) in both sides of room is measured. The SPL difference between two rooms indicates the Noise Reduction (NR). The investigations were done using different value of flow resistivity and frequency. The results show that NR is increasing as the flow resistivity and frequency increased. For flow resistivity of 800 MKS Rayls/m, the paper can attenuate noise up to 20 dB at frequency 8000 Hz. This value is much higher then the value achieved using plants. For both papers and plastic, in the frequency range 200 � 2500 Hz there is a fluctuation value of NR due to the behaviour and properties of materials. This region is called a coincidence region. Key words : Noise, Flow Resistivity, Noise Reduction, Sound Pressure Leve