Abstract :
The article discusses the task of modeling the working hydrodynamic processes occurring in hydraulic drives with frequency-throttle regulation of the mechanisms of movement of traction and load-bearing ropes, at all stages of the movement mechanism — the stage of acceleration of the transported cargo, the stage of steady (stationary) movement with constant speed and the stage of braking when approaching the final breakpoint. As a circuit that implements throttle control, possible hydraulic circuit designs for sequential installation of adjustable throttles relative to the hydraulic motor are considered — one-sided installation of one throttle and two-sided installation of two throttles with the same and different settings. To solve this technical problem, a mathematical model of the hydraulic drive and a computer program that implements it were developed. The model provides a computer simulation over time of the processes of change over time of such basic technical characteristics of the hydraulic drive as pressure 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 power motion parameters of traction and load-bearing ropes (distance traveled, linear speed and acceleration, required power, overcome operating loads). In relation to a specific variant 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 effect of various options for installing adjustable throttles and their settings on the calculation results is shown.
Keyword :
mobile aerial rope complex, hydraulic drive, frequency-throttle regulation, modeling