Spatial dependence of noise in different agricultural tractors engine revolutions

Abstract

Several elements affect workers' health, and the noise was a major factor causing stress and harmful to operators, which are exposed for many hours to loud noises. The objective was to quantify and measure the amplitude of the noise values at different speeds from two tractors. The test was conducted on the premises of Machinery Test Center and Agroforestry tires, Faculty of Agricultural Sciences, Botucatu/SP, UNESP. The noise was measured with a decibel meter mark Icel model DL-4200. We used two tractors of 78 horsepower, three-cylinder, turbo and open cockpit. The rotations were chosen speed 2200 rpm and 2400 rpm. The noise values were analyzed geostatistical. The spatial variability of noise around the tractor had greater reach in full throttle with 31m. The noise values in excess of 85dB were found within 7m to working speed and full throttle to 11 m in relation to the tractor. The values found in these distances are considered prejudicial to machine operators and for individuals to remain near the tractor according to the standard NR 15.