RESEARCH ON THE INFLUENCE OF THE MAIN VIBRATION-GENERATING COMPONENTS IN GRAIN HARVESTERS ON THE OPERATOR'S COMFORT

The research aims to estimate the influence of the main vibration sources in grain harvesters on the combine operator. The study also has a comparative aspect, including two harvesters, a conventional one (C 110H) and one with an axial flow (CASE IH). The main sources of vibration considered were the thresher, chassis, and header for both types of harvesters, with the addition of the shaker as a source for the conventional harvester. The receiver is considered to be the operator's seat. The emission spectra of each source are recorded according to ISO 2631-1:2001 and ISO 2631-5:2018, as well as the spectrum received at the operator's seat. To estimate the influence of vibration sources on the operator's seat, interspectral correlations and influence coefficients were studied. The conclusions are useful for ranking the intensity of vibration sources affecting the operator's comfort and for comparing the comfort level between two grain harvesters with different operational technologies. What the paper introduces as new in the field of estimating the exposure time limit to harvester vibrations is the calculation algorithm for the exposure time limit and vibration intensity estimators.