Steady-state performance investigation of hydrostatic summation drive using bent-axis hydraulic motor

Abstract

This article investigates the steady-state performance of a closed-circuit hydrostatic summation drive used in heavy earth moving machine through modelling and experiment. The proposed drive basically consists of variable displacement pump and bent-axis motor. The performance studies of the drive have been made for its two different modes of operation: using single motor and two motors. Bondgraph simulation technique is used to model the drive, where various losses are lumped into suitable resistive elements. The relationships of the losses with the state variables obtained from the model are identified through experiments. The dependencies of the loss characteristics on the load torque and the pump displacement ratio are studied. The model has been verified experimentally. The performances of the hydrostatic drives are studied at different torque levels with respect to its slip, torque-loss and overall efficiency, using the expressions describing the characteristics of the loss-coefficients. The investigation also identifies the operating range of the proposed hydrostatic drives with reasonable efficiency.

Comparison of the steady-state performance of hydrostatic drives used in the rotary head of the drill machine

“…19, 20). However, the efficiency characteristics of the systems discussed in this article are almost similar to that of the results obtained by Shi et al [9], Kumar et al [13], McCandish et al [23] and Mandal et al [25].…”

“…The mean of the The characteristics of the resistances of the piston-type hydraulic components expressed by Eqs. (43) through (50) were also recognized by Kumar et al [13], McCandish and Dorey [23], Lux and Murrenhoff [24] and Mandal et al [25].…”

“…Single motor LSHT hydrostatic drive is more compact in design and it is more suitable for the rotary head of drill machine cutting medium to harder rock, whereas for the softer rock formation, two-motor HSLT drive may be preferred as it gives higher efficiency at high speed range leads to faster drilling rate. Also, using suitable control strategy, changing the drive mode from two motor to single motor [13], the drilling can be performed by HSLT drive for wide range of rock strength (for soft to hard rock).…”

“…An investigation of hydraulic motor efficiency and tribological surface properties have been proposed by Miller et al [12], where they have proposed that hydraulic motor efficiency (geroler, axial piston, bent axis, and radial piston motors) does not depend only on viscosity but also on the operating conditions where surface interactions of lubricant additives can affect friction and efficiency. Kumar et al [13] have studied the performance of the primary controlled two-motor hydrostatic summation drive used in off-road vehicle both theoretically and experimentally. The system considered in such studies comprises a swash plate-controlled piston pump and two identical bent axis hydro-motors.…”

Steady-state performance investigation of open-circuit hydrostatic drives used in the rotary head of drill machine

“…Additionally, they devised the strategies for operating the system in the most effective manner. Kumar et al 8 carried out both simulation and experimental examination of a primary-controlled hydrostatic summation drive utilized in heavy duty mining vehicle for studying its performance. A swash plate-controlled piston pump along with twin-alike bent axis hydraulic motors comprised the system under consideration.…”