Modeling the performance of a forest machine with a vertical removal of a tree

Abstract

The study is devoted to the analysis of the performance of a wheel-type logging machine with a gripping-cutting device installed on it when performing technological operations for the removal of a cut tree from a cutting area to the place of packing on a portage by the machine. The paper proposes an information-logical model of the technology of operation of a logging machine and a mathematical model for determining the time for performing technological operations for the removal of a cut tree in a vertical position by the course of a logging machine. A detailed analysis of the components of the technological process of the logging machine was carried out. On the basis of the mathematical model, the time components of the shift productivity of a logging machine with a vertical removal of a cut tree were determined. A formula is proposed for calculating the productivity of a logging machine, taking into account the sequence and frequency of operations. As a result of the work, the dependences of productivity on the length of the path from the portage to the tree were revealed at different speeds of the machine when removing a vertical tree for different apiary widths. It has been established that the cycle time for processing one tree at the minimum values of the parameter variation range is 165 s, of which 90% of the time is spent on moving operations. At the same time, the minimum theoretical shift productivity of a logging machine with an average volume of one tree of 0.1 m3 is 13.64 m3/cm. The simulation results show that increasing the length from 15 m to 30 m reduces productivity by only 1-5%, but doubling the travel speed increases productivity by 50%.