| One of the problems of agricultural mechanization is noises caused by the use of machines. The noises should be evaluated due to the negative effects on health and safety level of humans working in this field. However, the purpose of this study is to investigate the effect of gear ratio and engine rotation speed on acoustic noise of John Deere 1055I combine harvester. The experiments were done based on sound international standards ISO 5131, ISO 7216 and the World Health Organization considering different levels of engine rotation speed (1800 and 2500 r/min), gear ratio (1, 2 and 3 H) and distance from the driver ear (10 cm, 7.5 m and 20 m). Three replications were considered for each treatment. The obtained data was analyzed by factorial test based on... |
