FORMATION OF A METHODOLOGY FOR IMPROVING THE PERFORMANCE OF A TRACTOR IN THE TRACTION MODE UNDER UNSTABLE STATE PARAMETERS
Abstract
The article discusses the problems of improving the performance of a tractor under unstable state parameters. The performance of a tractor is characterized not only by its ability to work (perform the assigned functions), but also by compliance with regulatory, technical, and design documentation. Taking into account that ensuring the stability of the tractor’s operation in the traction mode is the basis for improving its performance, the study presents a methodology for ensuring the accuracy of its operation under unstable state parameters. In accordance with the current Ukrainian regulatory documents, the functional indicators include the traction-speed properties of the tractor in the traction mode, the stability of movement and braking. Using a measuring and recording complex developed on the basis of the method of partial accelerations, with the participation of the authors of this article, the functional indicators of the John Deere 8335R and John Deere 8430R tractors were evaluated when performing various agricultural technologies. The maximum error when comparing theoretical and experimental results does not exceed 5 %. Existing methods and means for assessing the functional indicators of tractors when aggregated with mounted, trailed, etc., agricultural machines, which are based on dynamometric devices, are not acceptable for assessing the performance of tractors in various operating conditions. The issue of improving the performance of tractors as part of variable-mass transportation and technological units, combined units when performing various agricultural technologies, which are currently in the highest demand in Ukraine’s agricultural sector, remains open. Based on the results of the research, a methodology for improving the performance of a tractor in traction mode by ensuring the stability of functional indicators has been substantiated. It has been theoretically proven and experimentally confirmed that a tractor in traction mode is efficient when the stability of traction and speed properties, stability of movement and braking is ensured. A methodology for ensuring the functional accuracy of a tractor in traction mode when evaluating its output and input parameters has been formulated. A technique for assessing the control reliability of functional accuracy and the performance of a tractor by errors of the first kind (failure to pass) and the second kind (false failure) has been proposed.
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