engleski

Mathematical Modeling of Closed-Circuit Hydrostatic Transmission

Besides the efficiency, the control ability and the fast response of a hydrostatic transmission are very important. In this regard, a DC servomotor can be applied as an actuator of the variable displacement mechanism of hydrostatic units. In this way, fast responses and favorable control ability can be accomplished. This paper gives a mathematical model of the closed-circuit hydrostatic transmission, with the DC servomotor actuated variable displacement swash-plate pump and a fixed displacement motor. The dynamics response of the swash-plate angle, and consequently of the pump flow, mainly depends on torques acting on the swash-plate. Relatively large torque is required to move the swash-plate quickly to a new position. Here the second order model of the swash-plate dynamics is given. The total model of the closed-circuit hydrostatic transmission is given in a form suitable for the experimental parameterization, since most of the required parameters are unavailable at producers’ data, and they should be verified experimentally. The presented model will be experimentally validated on the experimental setup of the hydrostatic transmission, which is designed at our Laboratory. The model will provide a necessary basis for the development and application of advanced control methods.

Hydraulic actuator; nonlinear model; servomotor

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