Avaliação do nível de ruído emitido por um trator agrícola acoplado a uma colhedora de milho

Abstract

The objective of this work to evaluate and compare the level of noise emitted by a tractor coupled to a corn harvester for the agricultural operation on different rotations of the engine, in order to identify healthy areas for workers. The experiment was conducted in city of Corumbá de Goiás-GO, during the corn harvest in July 2015. The noise level data were collected using a digital sound pressure level meter, being collected in an area free of obstacles, with dimensions of 40 x 40 m, over a grass-covered soil. The tractor was coupled to the corn harvester with no load in the center of that area. Noise level was collected based on the Seat Reference Point (SRP), at the average height of the operator’s ear, distributing the collection points in an equidistant mash of 5m in relation to the SRP. The treatments used were: variation of engine speed at 1600, 1700, 1800 and 2000 rpm. The noise level found in this study, in all evaluated situations, presented an average value above 79.0 dB (A). The use of ear protectors is recommended for operators located at a distance shorter than 8,0 m at any engine speed and at 3,0 m for different variations of power.