The results of experimental studies to determine the optimum frequency of rotation of the drum and the optimum ratios of the mechanical gear Electromechanical actuator gravity mixers. Recommendations on the use of different types of actuators depending on the scope of use of the machines.

Keywords: "gravity concrete mixer, Electromechanical actuator, modular design, experiment, mixing drum rotational speed, induction motor, reducer "

The dependence of allowing to determine the optimal mode of reducing speed when approaching trains to areas with restrictions to ensure maximum road conditions on the average speed. The presented method will accelerate and refine the calculations in modeling the movement of logging trucks.

Keywords: timber transport, traction calculations, traffic simulation, indicators movement, restrictions, braking

The article suggests technique of optimization of tree cutting and skidding process via felling-skidding machines and felling-skidding-processing machines. The realization of this technique will allow reducing of time costs and raising of machine efficiency taking into account accessibility of stand cutting, relief features and technological working conditions.

Keywords: integrated machine, cutting, tree, timber harvesting, skidding.

An analysis of the problem of increasing the efficiency of the functioning of the logging trucks for hauling timber to the lower timber depots and consumers. Proposed technical solutions for of raising cross-trains in complex natural and industrial environments.

Keywords: Active semi-trailer used forestry, passableness, prosary operation.

Present the method for determining the optimal plan wood harvesting and hauling on logging enterprise. The method is recommended for use in enterprises applying cut-to-length logging. Optimization criterion is the minimum cost of harvesting and hauling wood. The method use will reduce costs and increase profitability for enterprise.

Keywords: logging area, base of forest resources, natural factors of production, primary wood transport, network transportation, costs

  To estimate the effectiveness of forest machines developed technological possibility coefficient. Coefficients reflect the ability to provide a given performance of transport vehicles in the logging, the decline in the quality of the skid road surface. Method allows determining the amount of logging residues, necessary for the skid road construction. At calculating the available volume accounted for logging residues. Resources of logging residues are calculated depending on the type of timber and the length of skid road. The method allows selecting the optimum system of machines to work in these natural production conditions or schedule performance loss due to reduced carrying capacity of skid road.

Keywords: Cross country, technological passableness, forest machines, bearing capacity of soils, skid road, wood types, logging residues

It article contains information about mathematical models which taking into account more factors affecting on the performance of logging trucks. Presenting the methodical approach that allows engineers to make management decisions that control of forest real-time and determination: the optimal composition of logging trucks, their technical and economic indices, charts of wood hauling, the volume of construction, reconstruction and maintenance of logging roads, the costs for these purposes and etc.

Keywords: Automobile forest transport, logging truck, haul road, scheduling, performance of the logging truck.