Browsing by Author "Perera, WJMK"

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item: Conference-Full-text
Utilization of sawdust and coconut coir fiber for producing noise reducing wall tile
(2013-11-26) Chathurangani, OS; Perera, WJMK; Kumari, HMNS; De Silva, GHMJS; De Silva, GSY
Today noise control has become a major requirement to provide a calm and pleasing living environment. With the technological development, industrial noises, which are mainly induced by machines, affects negatively on the day-today life of surrounding people. They have faced with many problems mentally and healthily. Noise control and its principles play an important role in creating a pleasing environment. This can be achieved when the intensity of sound is brought down to a level that is not harmful to human ears. Noise barriers, noise absorbers, reflectors are used for noise controlling purpose. This research was conducted to investigate the potential of using saw dust and coconut coir fiber as sound reducers for giving a solution for the existing industrial noise problem. Wall tiles were made by using saw dust. The effects of the thickness of the tiles, their surface condition and the sawdust particle sizes on noise controlling properties were investigated. In addition, panels were casted mixing coconut coir fiber with latex of rubber. Noise Reduction Co-efficient (NRC) of these tiles was investigated by using an experimental setup including signal generator, speakers and noise level meter. The results for the saw dust tiles have showed that there was a significant effect of the tile thickness, surface condition, mix proportion and sawdust particle sizes on NRC. The NRC values obtained for sawdust tiles ranged from 0.1 to 0.5 while that for the coir fiber panels was 0.01-0.6.
item: Conference-Full-text
Utilization of sawdust and coconut coir fibre as noise reducing wall surface materials
(2013-11-09) Chathurangani, OS; Perera, WJMK; Kumari, HMNS; Subashi, GHMJ; De Silva, GSY
With the technological development, industrial noise, which is caused by machines, has become a severe problem for the day-today life of people. They have faced with many problems mentally and healthily. Therefore noise control plays an important role in creating a pleasing environment. This can be achieved when the intensity of sound is brought down to a level that is not harmful to human ears. Noise barriers, noise absorbers, reflectors are used for noise controlling purposes. This research was conducted to investigate the potential of using sawdust and coconut coir fiber as sound reducers for giving a solution for the existing noise problem. Wall tiles were made by using sawdust and panels by coconut coir fibre. For preparation of tiles using sawdust, sawdust particles were mixed with cement and sand. Latex of rubber was used with coconut coir fiber to produce pannel. For these tiles, sawdust particle sizes and tile thickness were varied. Noise Reduction Co-efficient (NRC), which is a ratio between the reduction levels of noise to the intensity of incident sound, was investigated by using an experimental setup including signal generator, speakers and the noise level meter. It was found that there was a significant effect of increasing the tile thickness, varying particle size, on NRC. NRC values obtained for sawdust and coir fiber tiles ranged from 0.1 to 0.5. It was found that these materials can be effectively used as sound reducing wall surface materials. Utilization of these materials will also reduce environmental pollution and improve sustainability.