SYSTEM APPROACH FOR ESTIMATING THE PERFORMANCE OF THE TRACTOR IN THE LIFE CYCLE
Authors:   L. Pogoriliy Ukrainian Scientific Research Institute of Forecasting and Testing of Machinery and Technologies for Agricultural Production, Kharkiv branch, Lebedev A. , Lebedev S. 
Published: December 2020

Purpose of the study. Substantiation of the methodology of a systematic approach to assessing the performance of a tractor at the stages of its life cycle. To achieve this goal, it is necessary to solve the following tasks: - explore the possibility of applying a systematic approach to assessing the performance of tractors; - to investigate the mechanism of applying a systematic approach to assessing the performance of tractors at the stages of their life cycle. Research methods. CALS-technology, which ensures the implementation of the strategy of organizing the production of new products based on new engineering technology, and is based on the electronic model of the product. The results of the study. The systematization of the functional indicators of the tractor, which form the basis of a systematic approach to assessing its performance at the stages of the life cycle, is carried out. The necessity of assessing the traction and energy indicators of the tractor by its dynamic and traction characteristics has been proved. The life cycle of a tractor is a set of interconnected processes of its creation and sequential change in state from the formation of initial data to the end of operation. At the same time, an effective system analysis of the life cycle of a tractor by a target criterion, for example, by its operability, which is characterized by the ability of the tractor to perform the specified functions established by regulatory requirements. The basis for the formation of the limiting values of the functional indicators of the developed tractor are the characteristics of the basic samples and analogues, the requirements of national and international standards, technical conditions, materials of research and development work, customer reviews, and others. The functional indicators of the tractor determine its technical level, which can be assessed using well-known methods. Conclusions. As a result of the study, the dependence of the tractor's performance on its movement speed, stability of the direction of movement and braking was substantiated; the basics of ensuring the operability of a tractor at all stages of its life cycle are considered: creation, production, circulation, operation, disposal. The scientific value of the study lies in the substantiation of the methodology of a systematic approach to assessing the performance of a tractor at the stages of its life cycle. The practical value of the study lies in the ability to predict the performance of a tractor at any stage of its life cycle, starting with design and analyzing the state of the tractor during its disposal, in order to improve performance in future design. The research results can be applied in the design, manufacture and testing of tractors, as well as in the field of their operation to assess the possible resource. Further research is required to predict the performance of tractors at the test stage.