Steady-state and sensitivity analysis of a closed-circuit hydrostatic transmission used in side discharge loader, a typical mining equipment

Hydraulic drive systems play a vital and significant role in the mining and construction equipment. It gives a smooth change in the output speed, torque, and power of the machine.. Regulation of the displacements of the pump and the hydro-motor of the drive facilitates the control of the straight running and steering of the machines. The present study deals with the performance analysis of hydrostatic drive similar to that is incorporated in an SDL machine. It consists of a variable displacement pump rotated by a constant speed electric motor and a variable displacement hydro-motor. They are connected in the closed-circuit configuration. The present study investigates the performances of the hydrostatic drive used in the SDL machine through detailed modelling and experimentations. The study finds a reasonable efficiency zone for the design guideline to operate the hydrostatic drive. The effect of perturbation of critical system parameters on the dynamic performance of the drive has been also studied through simulation of the developed model. The outcome of the present work should be expedient for the preliminary design and assortment of similar hydraulic drive used in the mobile, mining equipment.