International Journal of Applied Science and Technology Vol. 4, No. 4; July 2014 46 Noise and Vibration of Tractors: An Ergonomic Evaluation Baesso, Murilo M PhD, Agronomist Department of Biosystems Engineering University of São Paulo – FZEA Brazil Martins, Guilherme A Undergraduate Student at Biosystems Engineering Department of Biosystems Engineering University of São Paulo – FZEA Brazil Baesso, Raquel C. E PhD, Agricultural Engineer Department of Biosystems Engineering University of São Paulo – FZEA Brazil Fischer, Clovis PhD, Electrical Engineer Department of Biosystems Engineering University of São Paulo – FZEA Brazil Silvestrini, Jonathas C Undergraduate Student at Biosystems Engineering Department of Biosystems Engineering University of São Paulo – FZEA Brazil Abstract The improvement and reliability of the agricultural machines provided a revolution in the human activities facilitating the production of commodities of agribusiness. Though, the efficiency of the tractor, well as the occurrence of accidents also depends on the level of fatigue to which the operator is submitted. Between the ergonomic factors that affect the operator machine, noise and vibration stand out among the principal. This study aims at evaluating the levels of vibration and noise emitted by agricultural tractors with different powers, comparing the results with existing regulations in Brazil. The tractors studied: MF 4292, MF 283, MF 297 and MF 680. As results, the structures of the seat were able to absorb the impact and creating a good working condition for the machine operator. The vibration levels, in general, were below the limits established for eight hours of work at frequencies 5-10 Hz, for the three directions for all tractors studied. Keywords: agricultural tractors, ergonomics, noise, vibration, level 1. Introduction The use of tractors in agriculture took place shortly after the Second World War and the beginning of 1950 were offered to the market wide variety of brands and models, but featuring configuration and rough appearance compared to what is observed today. In Brazil, 1960, was observed the beginning of concerning with ergonomic aspects, with emphasis on occupational safety and operator comfort, at which time the tractor industry in Brazil was installed. The evolution of the national fleet can be seen in Figure 1.