EFFECT OF CABIN ON NOISE ATTENUATION AT DIFFERENT ENGINE SPEEDS IN CABBED AGRICULTURAL TRACTORS USED IN COFFEE CULTIVATION AND GRAIN CROPS: A CASE STUDY
DOI:
https://doi.org/10.66104/2mjtxx41Keywords:
Tractor cabins; Multivariate analysis; Engine speedAbstract
The modernization of agriculture, driven by the intensified use of machinery, has led to substantial gains in productivity alongside reductions in operational costs. Despite these advances, concerns regarding occupational health have increased, particularly in relation to noise exposure from tractors, which is widely regarded as a significant risk factor for operators. Even in cab-enclosed tractors, noise levels remain considerable, affecting not only hearing but also communication, concentration, and work performance, in addition to contributing to psychological effects such as stress and mental fatigue. This study aimed to evaluate the effectiveness of tractor cabins in attenuating noise under different engine speed conditions in operations involving coffee cultivation and rainfed crops, including maize, sorghum, and soybean. The analysis considered two tractor models, John Deere 6110J and Yanmar 1155-4, through measurements of sound pressure levels obtained in a controlled static field experiment, both inside and outside the cabin. The experiment was conducted at the agricultural mechanization sector of IFSULDEMINAS – Muzambinho campus, adopting a completely randomized design with four replications per engine speed. The John Deere tractor was evaluated using a 5×2 factorial arrangement, combining five engine speeds (1400 to 2200 rpm) and two measurement environments. The Yanmar model followed a 4×2 factorial scheme, with engine speeds ranging from 1550 to 2150 rpm. The data were analyzed using Hierarchical Cluster Analysis (HCA) to identify similarity patterns, followed by regression analysis, with statistical significance assessed at P<0.05 and model fit evaluated through the adjusted coefficient of determination (R²). The results indicate that, although cabins contribute to noise attenuation, the levels remain high and frequently exceed the limits established by NR-15.
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