Níveis de potência sonora emitidos por um trator agrícola, em condição estática, acionando uma recolhedora trilhadora de feijão e uma trilhadora estacionária

Abstract

This study aimed to evaluate the sound power levelsemitted by an agricultural tractor under static conditions drivinga bean picker and a stationary picker. Sound power levels measurements near workers' ears were collected and spaced 1 to 10 m from the tractor seat on the left, right, front and rear sides. Five readings were performed at each point in accordance with Standard NR-15. If the dispersion of the readings exceeded 3 dB (A), another measurement was made until the readings were limited to this dispersion. Polynomial regression equations were adjusted for the averages of the 5 readings in the three treatments. There was considerable variation in the sound power levelson the sides collected, showing the importance of knowledge on the equipment handled. The sound power levels decreased with the increase of the distance from the noise source; proving that there is a comfort area that varies according to the machine. The bagger of the picker collector and the operator of the stationary picker could be only 1 hour of daily exposure without the use of hearing protectorsand the tractor operators2hours. The use of hearing protectors for these agricultural machine operators is essential.