Análise de variáveis canônicas no desempenho de um trator agrícola com diferentes tipos de pneus e sobre pistas de ensaio distintas

Abstract

The performance of the tractor when subjected to traction by drawbar is influenced by tire parameters, soil condition, type of implement and tractor configuration. The objective of this study was to evaluate the performance of an agricultural tractor equipped with radial and diagonal tires on an asphalt concrete track and on a solid ground track without cover, with different forces on the drawbar. Two experiments were installed, both in a completely randomized design, one experiment for radial tire and one for diagonal tire, the two in factorial scheme 2x6, composed of twelve treatments each, three repetitions per treatment, totaling thirty-six trials for each type of tire. For both the radial and diagonal tires, the first level of the factorial scheme consisted of two different surfaces of the test tracks (asphalt concrete and unprotected ground) and the second level of the factors were the load demands on the bar, composed of six tensile forces (1,5, 4, 10, 15, 20 and 24 kN). To measure the force a load cell was used; for fuel consumption, a flowmeter and for skating, magnetic sensors. The other variables were calculated from the data collected. The tractor equipped with radial tires, in both types of tracks, performed better than when equipped with diagonal tires. The analysis of canonical variables was well suited to the performance parameters of the tested agricultural tractor, explaining 93% of the variations between the observed parameters.