One of the requirements to the cabin of a forestry machine is the ability to absorb a certain amount of energy during deformation in the event of a rollover. The paper presents a method for increasing energy absorption of protective structure of a forestry machine cabin, enabling to reduce the risk of injuries to the operators in the event of an emergency. This is achieved by introducing into the structure of the protective frame of a cab energy-absorbing mounts in which the energy is absorbed due to plastic deformation of their elements in the event of a rollover of forestry machine. The article presents the design of the mount, describes the principle of its operation in the event of an emergency, and theoretical and experimental studies of the deformable mount. As the result of theoretical and experimental investigations the geometric parameters of the energy-absorbing mount are determined.

The article presents the methods and the results of the experimental investigation of the additive influence of shungite nanopowder when mixed in the glue for three-ply particle board. The hypothesis of shungite nanopowder influence on physical-mechanical properties, water absorption and thickness swelling of wood particle board was formulated. The results of experimental investigations proved that the optimum shungite nanopowder quantity in glue solution makes up about 10 % of absolutely dry resin mass. Wooden particles of aspen and coniferous species, as well as glue solution based on carbamide-formaldehyde resin, were used in boards manufacturing. The samples were tested in order to determine physical-mechanical properties. It was found out that the 10 % shungite nanopowder additive increases the breaking point of three-ply particle board under bending strength by 18.3-25.7 %, the breaking point of three-ply particle board under tension perpendicular to the face of board by 7.5-11.7 %. As the result of experimental investigation it was found out that the 10 % shungite nanopowder when mixed in the glue decreases water thickness swelling of three-ply particle board up to 14.2 % and water absorption by 10.6-20.1 %. The shungite nanopowder powder contained particles of 50...100 nm in size and specific surface of 120 m2/g. In the course of the experiment three-ply particle boards were used with the thickness of 15.6 mm.