In this article, a universal tractor processor (UTP) is proposed. The UTP allows you to harvest all types of trees and process them into assortments and for fuel chips. The maximum productivity of the UTP for the output of assortments will be in the case of logging business trees with the production of chips (option 2). The total productivity of the UTP will be maximum when it is working by the option 3, when business and low quality non-commercial trees are harvested. In practice, if the goal is to maximize the output of business assortments, then the UTP work should be organized according to the option 1 or 2. If the time to clean up the logging residuals before the UTP is longer than the time to process the residuals into fuel chips, then option 2 will show the best results. In this case, in addition to the maximum output of assortments, additional products will be obtained – fuel chips. The maximum productivity of the UTP for the output of assortments is achieved if you exclude the harvesting of thin-sized trees (option 3).

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The article presents theoretical and experimental studies for choosing a manipulator for a harvester taking into account of natural and technological aspects of sustainable development of the forest complex. A mathematical model of the harvester operation is developed based on natural and technological factors, as well as the characteristics of the machine base and the harvester head. Experimental results allow us to determine the rational characteristics of the manipulator for Siberia region of Russia, in particular, the permissible overturn and load moments of the manipulator for the specified characteristics of the base machine and the selected harvesting head. The maximum outreach of the manipulator’s boom in the range from 8000 to 11000 mm has little effect on the volume and number of harvested trees. The percentage of harvested wood volume almost does not depend on the maximum manipulator boom outreach and remains within at least 85%.

Upon carrying out logging, residues remain in the cutting area. Logging residues are an additional source of wood raw material for the production of fuel chips to be used in bioenergetics. In order to plan the logging residues collection and processing technology, it is necessary to gather information on the amount of this type of waste and its distribution within the cutting area.The article deals with the line intersect (LIS) method.The aim of this article was to assess the accuracy of the LIS method for quantifying logging residues after cut-to-length logging (CTL), uniformly distributed within the technology traffic lanes (strips) of width b on the cutting area of arbitrary shape S.The studies were conducted using computer simulations. In the models, logging residues are represented as clusters in the form of circles. The laws of distribution of the radius of the clusters and their position in the plot were determined by field measurements.In the simulations, clusters uniformly distributed along the X-axis and stripes on the Y-axis were considered. The samples of lines were the set of lines of different length and mutually perpendicular and parallel to the coordinate axes X, Y.In the simulations, four types of stripes were considered with a different angle to the Y-axis. Type 1 – angle = 0°, type 2 – angle = 15°, type 3 angle = 30°, type 4 – angle = 45°.It was determined through simulation that the estimated mean radius of the clusters is greater by 24% than the true mean radius.The LIS method formula is appropriate for estimating the amount of forest residues after CTL logging provided the true mean radius is taken. According to the results of simulation experiments, it was found that the results are in good agreement with the theoretical formulas if the location of the sample lines is mutually perpendicular and parallel to the coordinate axes X, Y of the area. Differences remain within the limits of 20% error.

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