Vibration load of the operator of a fellerbuncher with limited lifting capacity during technological moves

Further improvement of feller buncher machine designs is associated with comprehensive theoretical and experimental studies of their operating modes. Taking into account the large labor intensity of experimental studies it is necessary to pay more attention to the development of theoretical methods. The article deals with the vibration loading of the operator of a feller-buncher machine of limited load-carrying capacity during technological relocations. The dynamic model of the system “Operator – feller-buncher machine – subject of labor – tree” is developed, which allows to determine the operator's vibration load at the stage of machine design. The mathematical description is made in the form of Lagrange equation of the 2nd kind. The system of equations is solved with respect to the elastic deformation of the operator's seat backrest by Runge-Kutta method, using MathCAD programming environment. The character is shown graphically and the maximum values of vibration impact on the operator are determined when working in the modes of acceleration and stopping, as well as the results of vibration impact are given. The analysis of research results shows that the modes of acceleration and stopping are accompanied by a significant dynamic load both on the machine and on the operator. The level of vibration load of the operator is generally influenced by the rigidity of his seat, acceleration time when starting from the place, and the volume of transported trees.

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