ANALYSIS OF PERFORMANCES FOR AN ELECTROHYDRAULIC SYSTEM FROM AUTO-TRUCKS

This paper presents the analysis of the possibility to improve the performance of an electro-hydraulic system from trucks, initiated as a need to cope with the requests from various operating scenarios. To this end, a winch-type system was modelled using Matlab and FluidSim softwares, through which different parameters could be varied to improve the resulting values characteristic to the analyzed system. The modelling was performed through three iterations, from simple to complex, so that the final model would be as close to reality as possible, containing the engine and power take-off model, the hydraulic system model that includes the hydrostatic motor and hydrostatic pump, the winch model-wheel and axle, spring and shock absorber (for cable simulation) and brake, as well as the load model. For validation, the traction force was calculated, the value of which was close to that indicated in the specialty literature (namely 134.5 kN), as well as the cable windingspeed (or the truck towingspeed), obtaining the value of 5.795 m/min. Finally, the improvement stage consisted in analyzing the possibility of increasing the speed of unwinding and winding the free cable.