Simulation modeling of resonance phenomena during the operation of regenerative hydraulic shock absorbers in the suspensions of trailing links of timber road trains

The article solves the problem of increasing the efficiency of timber truck trains of different configuration under unsteady driving modes in the process of timber transportation in the conditions of insufficiently equipped forest roads. The experience of operation of forest road transport shows that the most part of fuel energy is spent by it on heat losses arising in its units and systems. The necessity to reduce energy losses in suspensions of trailing links of forest road trains by means of transformation of this energy, accumulation and subsequent useful use is substantiated. In order to increase the efficiency of forest road trains the perspective designs of trailing links equipped with recuperative hydraulic shock absorbers are offered. To assess the performance of the proposed trailing links as part of timber truck trains, mathematical models have been developed that take into account the resonance phenomena occurring during the movement on the supporting surface of the studied timber truck trains. The research was carried out with the help of the developed computer programs. Equipping the suspensions of trailing links with regenerative hydraulic shock absorbers allows reducing the amplitude of resonance vibrations for a forestry tractor-trailer truck from 87 cm to 26 cm, for a forestry tractor-trailer truck from 27 cm to 20 cm and for a forestry truck-trailer combination from 46 cm to 33 cm. The recuperated power generated by the trailer link suspension was 7.8 kW for a truck-trailer combination, 9.1 kW for a forestry tractor-trailer combination, and 22.4 kW for a forestry tractor-trailer combination. The optimum value of the damping coefficient of an individual regenerative hydraulic shock absorber was 30 kN · s/m.