EVALUATION OF LEVELS OF NOISE AND VIBRATION OF A TRACTOR-SPRAY SET, FOR EACH WORKING SPEED - DOI: 10.13083/1414-3984.v22n02a02

Abstract

The objective of this study was to evaluate the noise and vibration levels of a mechanized tractor-sprayer set, in function of the working speed. The work was conducted in the Laboratory of Agricultural Mechanization, Department of Agricultural Engineering, Universidade Federal de Viçosa - MG. To determine the levels of noise and vibration transmitted to the body of the operator a dosimeter model Wed007 was used, manufactured by 01dB in Brazil and one triaxial accelerometer model Maestro, respectively. The working speeds used were 4.0, 5.0 and 7.0 km h-1. The results obtained for the noise levels were 98.2 dB (A) for the speed of 4.0 km h-1, 98.1 dB (A) for 5.0 km h-1 and 97.4 dB (A) for 7.0 km h-1. In the vibration analysis the results were 0.58 (4.0 km h-1); 0.60 (5.0 km h-1); and 0.60 (7.0 km h-1) m s-2. According to the results it was concluded that all noise levels were superior to the established standard NR-15 of 85 dB (A) for a work shift of 8 hours per day, and increased speed resulted in reduction noise levels. The vibration of the tractor-sprayer showed values above the thresholds set by the European Directive of 0.5 m s-2 at all speeds evaluated, also being influenced by the forward speed of the mechanized set.