assessment of noise exposure in operator cultivator tiller

oroginal article tiller is a handy multi – a purpose tractor is used in agriculture. the noise emitted from tiller may be seriously affected auditory system users. the purpose of this study was to evaluate the exposure to noise in operators of this device. in this study 36cultivator tiller was examined. measurement of sound is based in iso 5131-1996 and iso 7216 standard and was conducted in in different mode by using the sound level meter cell – 450 models. to evaluate the exposure to noise measurement was performed in a state that tiller was working in extreme mode but to analyze the frequency and dominant frequency noise measurement tiller was in a state that tiller was in the middle of his career. the level of noise 8 hours exposure in different modes measurement include static and neutral (mode) , plowing the land with 1 gear and plowing the land with 2 gear is respectively 90 , 94.73 and 95.17 db  that is more than standard . frequency analysis results indicate that in each 3 measured modes, frequency 2000 is dominant frequency. and the maximum level of exposure is in this frequency. exposure to noise at a frequency of 2000 in neutral (mode), plowing the land with 1 gear and 2 gear is respectively 81.30, 86.97 and 88.11 db . results of the present study indicated that in all measured situations, exposure to noise was higher than the standard limit and there was risk of hearing loss. thus further studies and control measures are necessary.