The work presents the review of modern log trucks under the recent sanctions imposed. The author states that the problem of renewing the existing log trucks becomes urgent for forest transporting and logging companies nowadays. There is a wide range of new basic chassis and trucks at the market to build log trucks with a wheel formula 6x4 and 6x6 produced by Russian, Belorussian and Chinese factories. A great number of trailer links is produced to build log trucks. There is an opportunity to buy used trucks of other companies. For the first stage of the technical and economic analysis and preliminary selection of the optimal type and composition of a logging truck, a comparative assessment of the effectiveness of logging trucks was carried out. The analysis shows that Russian log trucks with engine power more than 400 HP (horsepower) can compete with the best foreign models. Nevertheless, the problem of reliability of Russian, Belorussian and Chinese log trucks needs further research.

Keywords: log trucks, trailer links, productivity, effectiveness

The article discusses the equipment for a single-seam excavator for removing single stumps and the technology of work with its use. A modernized design of this equipment is proposed, an analysis of the modified technology of uprooting is performed, recommendations on the use of the proposed equipment are given based on the results of the comparison.

Keywords: technology of uprooting, single stump, direction of stump extraction, moment of uprooting of trees

At present time, there are attempts to design and produce forest machines of highly-demanded classes in Russia. The paper evaluates the efficiency of forest machines under identical operating conditions. The analysis showed the possibility of using harvesters and forwarders of joint Belarusian and domestic production for logging works as an alternative to foreign forest machines. Evaluation of proposals revealed advanced Russian and Chinese models of forest machines. The research showed that in our country there are prerequisites for the development of forestry machine-building, while the main problem is the lack of production technologies for the manufacture of modern technological equipment and components. Under these conditions, the evolution of production on the national territory of forest machines and technological equipment without involving domestic or foreign capital and innovative technologies is a difficult task.

Keywords: domestic forest machine building, development prospects, forest machines, production

The article outlines the features of the developed algorithm for controlling autonomous industrial forest management facilities under real operating conditions under the forest canopy. A significant challenge faced by the developers in the presented algorithm was the practical absence of global navigation in the areas of use of potential autonomous industrial forest management objects. Thus the only alternative was local positioning algorithms, which of the existing ones were also unserviceable under real forest canopy conditions. The problem was exacerbated by the high requirements for positioning accuracy not so much for autonomous objects as for positioning accuracy relative to the object of work of the contact elements of technological equipment directly implementing the operations of the industrial timber harvesting process. The developed concept of local positioning has no analogues in the world, belongs to the algorithms of the latest generation, created by the authors on the basis of mathematical modelling of the operations of industrial forestry process and implemented in registered software complexes to manage the information flows that ensure the sustainable functioning of autonomous objects of industrial forestry in real operating conditions.

Keywords: algorithm, method, synthesis, positioning technology, control method, digital model, automation, digitalisation, modelling

The article considers aspects of industrial forest management based on automation of control of local positioning, engineering and information technology of unmanned industry. Original algorithms for automatic control of unmanned technical systems and contact elements of technological equipment under the forest canopy, directly implementing the operations of the technological process, have been created and tested. Software complexes for data collection and control of information flows, providing stable functioning of the last generation local positioning means, have been developed and registered. The designs, methods and architecture of unmanned ground, suspended and airborne systems for industrial forest management, forest maintenance, located in specially protected natural areas and industries indirectly related to forest or forest land have been proposed.

Keywords: automation, digitalisation, method, algorithm, synthesis, technology, positioning, control method, digital model, modelling

The article analyzes the use of various machines and equipment for performing cultural works in the process of reclamation construction, road construction, soil cultivation for further use in agriculture, forestry production. A new design of replaceable working equipment for removing single stumps is proposed, consisting of a cylindrical knife, a screw and a cleaver. During the production of works, the screw of the working equipment is screwed into the stump by means of a drive. The paper evaluates the economic efficiency of using this equipment in the technological complex of machines, taking into account the cost of work and the timing of their implementation. The analysis carried out on a limited volume of work showed not only a reduction in the cost of work performed by the proposed equipment as part of the Masha technological complex, but also the possibility of reducing the time of work.

Keywords: uprooting technology; single stump; stump cleaver, cylindrical knife