Assessment of Noise Pressure Level and Frequency Analysis of Garden Tractor

Accelerated development of agricultural mechanization is causing problems on occupational health and safety for people working in different fields of agriculture. Noise is considered as one of the most debilitating conditions in farming and therefore, a comprehensive investigation in this relation is required. In this study, some factors affecting the noise generated by a Goldoni garden tractor were evaluated. Studied factors were including engine speed, gear ratios, type of operation and microphone distance. In this relation, factorial experiments in randomized complete block design with three replicates were performed. The results of this study indicated that different levels of gear ratio, type of operation and microphone distance at level of 1% and engine speed is significant at 5% are significant variables. Also the results of this study revealed that sound pressure level decreases with increasing center frequencies. At center frequency of 4000 Hz, it was 56.65 dB. According to the results, the maximum sound pressure of this garden tractor was 94.87 dB.