Construction of information and mathematical models of unbalance of the long auger of the combine harvester at reliability calculations.

The paper proposes methods of research and calculation of optimal auger configuration for grain harvesting machinery. The main types of loading on auger supports are analysed when changing auger diameter, pitch, direction and type of helical spiral. The dynamic unbalance of long screw augers is studied. Proposals for the general balancing of the auger during its working operations are formed in order to reduce vibration, noise and increase the service life of the machine. Calculations, methods of determination of technological imbalances, as well as their connection with manufacturing accuracy have formed the basis for creation of information platforms for automated engineering design of highly reliable screws. Proposals for calculation of the main geometrical parameters of screws are formulated. The algorithm of construction of automated calculation processes for selection of optimum geometrical characteristics of long screws on the basis of the received frequency equations and formulas is developed, and also the programme allowing on the basis of available computer technologies to make repeated calculations of critical rotation frequencies of system "long screw supports" at one-time calculation of the screw released from supports is created. A number of proposed design solutions of the elastic-linked suspension of the auger, providing the best characteristics of vibration damping, proposed and implemented in the research work allowed to reduce the level of vibrations transmitted from the auger to the machine structure through the rigid suspension by 15%. [ABSTRACT FROM AUTHOR]