AVALIAÇÃO DE RUÍDO EM TRATORES AGRÍCOLAS EM CONDIÇÃO ESTÁTICA

Abstract

Agricultural mechanization has become a fundamental part of agriculture, due to the search for optimization in production. But, in most cases, they demand the maximum use of all their functions, often neglecting the operator's working conditions, as in relation to noise, as they can cause hearing damage, as well as other consequences. The objective of the work was to evaluate the noise level of the agricultural tractor in a static way as well as its effects on the rural worker, comparing the results with the NR 15 and to evaluate the noise levels emitted by tractors in four different speeds. The work was carried out at Fazenda São Luiz – Estrada das Lages, rural area, municipality of Cristalina, State of Goiás. The noise level was evaluated in different positions (front, rear, left and right) on two tractors, having as point reference point, the center of the tractor, and from there the piles were positioned at the following distances: 5, 10 and 15 meters. The tractors were subjected to two different rotations each: 700 rpm rotation (slow) and 2000 rpm (high) for the MF 290 tractor and 800 rpm rotation (slow) and 1600 rpm rotation (high) for the MF 65x tractor. Noise measurements were also carried out at the operator's station using the decibel meter, close to the operator's ear region in the 4 rotations mentioned above. The noise level under analysis and comparison between the MF 65 and MF 290 tractors was noise values below the recommended by the NR15 of 85 dB (A) which causes hearing loss with the use of 8 hours daily. When analyzing the rotations (slow and maximum) in the respective positions from the data we saw that in the slow rotation the two machines remain in the norm, later in the maximum rotation the machines exceeded the recommended bringing auditory discomfort with 94.13 in the MF 290 and 88 machines, 16 MF 65 both at the operator's station, once at a distance of 5 meters on the right side we obtained a noise value of 86.8. Regarding the distances, which cause greater damage to the operator, it was observed that the higher noise levels are closer to the operator's station, that is, they decrease when the distance in relation to the tractor increases, being tolerant from 5 initial meters.