The article schematically considers a proposal for development and application of a controlled power distribution mechanism for machines involved in timber industry and agriculture. Use of the mechanism will increase energy efficiency of skidder and forwarder on tractor chassis, improve steering quality of tracked vehicles and improve controllability of wheeled vehicles. For articulated vehicles, use of a controlled power distribution mechanism is expected to reduce stresses on swing mechanism. The article presents analysis results of literary sources on problem of using controlled power distribution mechanisms in transmissions of tracked and wheeled vehicles. Advantages of using such mechanisms in transmissions of tractors and forest vehicles on their chassis are shown. References are given to publications containing descriptions of mechanisms that are similar in characteristics to the developed one and known methods for determining main parameters of power distribution mechanisms, approaches to kinematic, force analysis and energy balance construction of such mechanisms. Kinematic diagram of a new controlled mechanism of power distribution is considered, main parameters, control technologies, and areas of its application are determined. Links between the project and currently developed capabilities of Russian production are outlined. Development prospects of technology for controlling distribution of power in transmissions of tracked and wheeled vehicles in the field of transport engineering are indicated. A reference is given to the research complex created and used at the Peter the Great St. Petersburg Polytechnic University, as allowing to conduct comprehensive tests of experimental models of transmissions of transport and traction vehicles.
The article deals with the interaction of soil-cutting elements of forestry machines with soil and trees and shrubs. It substantiates the statement that when choosing wear-resistant coatings when hardening tillage working bodies, it is necessary to take into account the composition and physico-mechanical properties of the soil. The method of choosing wear-resistant coatings depending on the hardness of abrasive particles of soil mass is considered. According to the results of experimental studies in the hardening of soil-cutting elements, it is recommended to use flame spraying of wear-resistant coatings from self-fluxing alloys.
The article shows the feasibility of improving the manufacturability of the prefabricated monolithic floors reinforced concrete structures production by reducing their own weight. In the works of the authors, the reduction of the sole weight and the cost is achieved by using the light materials filling the inter-gully space. It is proposed to use gas-concrete, polystyrene foam concrete blocks or limestone-limestone blocks as a local building material in the Crimea with such materials for the advanced system MARCO. Due to that, the cost of the interfloor overlap device has been reduced by approximately 10%. In addition, there is an additional cost reduction also due to the improved ergonomic work performance, increasing the productivity of workers by 6%. Innovative design and technological solutions are also presented, replacing the part of heavy concrete in a flat floor slab with hollow cores made of lightweight artificial materials - expanded polystyrene, polyethylene or cement wood.
The purpose of the article is to summarize the calculation procedure and calculate the forest machines floatation depending on the type of mover and soil conditions. Research methods are analysis of literary sources, numerical methods of applied mathematics during calculations and calculated data approximation. Formulas and the procedure for calculating the track depth, the coefficients of resistance to movement, adhesion and traction of the forest machines movers are given. In the compiled mathematical model, slipping is not an input parameter; its value is determined by calculation comparing the resistance forces to movement and the mover adhesion to the bearing surface. According to the calculations results, it was found that forestry machines with a caterpillar mover have greater cross-country ability compared to wheeled vehicles. On weak and moderate soils, the bearing floatation loss of tracked vehicles due to insufficient mover adhesion to the bearing surface does not occur. A factor limiting the pressure of the caterpillar mover on the bearing surface should be recognized as the track depth, since at a pressure of more than 0.04 MPa, the track depth exceeds the machine clearance. To ensure the bearing floatation of wheeled vehicles on weak soils, the pressure of the wheeled mover should be limited to 0.6 MPa. To ensure the bearing floatation of wheeled vehicles on moderate soils, the pressure of the wheeled mover should be limited to 0.95 MPa.
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