Modeling operation modes of hydraulic drives with frequency-throttle regulation of mobile transport and overloading ropes complexes

Mobile ropeways, the equipment of which is located on the base chassis of wheeled or tracked vehicles of high carrying capacity, are a promising type of transport and overloading equipment. Specific design features, modes and conditions of their operation in comparison with traditional freight and passenger fixed-line cableways require the development of special design methods and design calculations for this type of machine. The article discusses the problem of modeling working hydrodynamic processes in hydraulic drives with frequency-throttle regulation of the mechanisms of movement of traction and carrying ropes, at all stages of the movement mechanism — the stage of acceleration of the transported cargo, the stage of steady-state (stationary) movement at a constant speed and the stage of braking when approaching the final breakpoint. To solve this technical problem, a mathematical model of the hydraulic drive and a computer program that implements it were developed. The model provides computer simulation of the time-varying processes of such basic hydraulic drive technical characteristics as pressures and volumetric flow rates of the working fluid at characteristic points along the length of the hydraulic system, pressure drop across the hydraulic motor and instantaneous hydraulic drive power, as well as kinematic and force parameters of the movement of traction and carrying ropes (distance traveled, linear speed and acceleration, required power, overcome operational loads). In relation to a specific version of the mobile rope complex, the calculations of the indicated hydrodynamic, kinematic and power parameters were carried out, as well as the analysis of the results obtained. The influence of the adjustable throttle setting on the calculation results is shown.