Study of Noise Control by Transparent Insulating Panel for Agricultural Machine (I)
Panel Structure and Performance
1998 Volume 33 Issue 3 Pages 133-138
Details
1998 Volume 33 Issue 3 Pages 133-138
In this study a noise insulating panel was developed using a natural based polymer gel sandwiched and boarded by transparent materials. In addition, a material between the boards of the noise insulating panel was selected and its application to a Welsh onion shelling machine was examined. Results of this study are as follows.
1) According to the transparency, it became clear that due to the 1.0% density of Gellamgum, the decrease in the transparency was just about 10%. Furthermore, the coefficient of light transmission showed 78.3%-71.7% in the five types of densities (0.25-1.25%) of Gellamgum and effect of the density was small.
2) According to the noise reduction efficiency, regarding the frequencies of the filtered noise coming through the insulating panel poured with a polymer gel, we can say that the coincidence effect at 315Hz and 3150Hz was significantly fairly reduced. By using Gellamgum, the effect and the noise at high range frequencies of 2kHz to 4kHz were fairly reduced.
From the measurements conducted, it was clear that Cgllemgum having a noise reduction efficiency, has a high light transmission coefficient. From the economic view point, the ease of handling and manufacturing, Gellamgum gel with 1% density was suitable and it was decided to be used as a stuffing material for the boards of the noise insulating panel.
3) Using the noise insulating panel, a soundproof cover for the Welsh onion shelling was constructed and was examined in order to reduce the noise.
Results of the frequency analysis showed that the noise coming from high frequency vibration of Welsh onion shells at frequency of 2.5kHz was reduced by 16.2dB. Moreover, it became clear that using the soundproof cover with high noise reduction efficiency, the transparency was the highest at 75%, and the soundproof cover was able to provide an excellent working environment relating to sense of hearing as well as sense of sight. Gellamgum widely used in food industry, acrylic plate and glue sold at market were used as basic materials for the soundproof cover which could be constructed easily. Therefore, every farmer having a small budget could possibly fabricate a soundproof cover which is pretty easy to use.
