Avaliação dos níveis de ruído de um trator agrícola em função do raio de afastamento e rotação do motor

Abstract

Noise emitted by agricultural machinery can cause health damage to workers when they are subjected to long periods of noise exposure. Therefore, the present work aimed to evaluate the noise level emitted by an agricultural tractor as a function of the distance radius and engine rotation, and to compare the results with the limits stipulated by the current regulations in Brazil. Thus, an experiment was carried out at the Federal University of Minas Gerais, regional campus of Montes Claros, in a flat location, without obstacles. The source of noise was a New Holland model TL.75E agricultural tractor under three rotations: 750, 1900 and 2400 rpm. The noise was measured using a Skill-Tec decibel meter, model Skdec-01, and the distance radius was defined by ten points spaced equidistantly from one meter, the first point being measured close to the operator of the agricultural tractor. The noise level was higher when the agricultural tractor was operated at a rotation of 2400 rpm, with a value of 93.5 dB and 75.6 dB being observed for the first and last points, respectively. Based on the results, it is verified the existence of uncomfortable and possibly unhealthy situations in a considerable percentageof the tests performed, so that the relevance of the topic was ratified and the need to use a noise muffler is shown.