Model of the floating bearing bushing movement in an external gear pump and the relation to its parameterization

Abstract

This article presents the modeling, simulation and experimental validation of the movementof the floating bearing bushing in an external gear pump. As a starting point, a complete pumpparameterization was carried out through standard tests, and these parameters were used in a firstbond graph model in order to simulate the gear pump behavior. This model was experimentallyvalidated under working conditions in field tests. Then, a sophisticated bond graph model of themovement of the floating bushing was developed from the equations that define its lubrication.Finally, as a result, both models were merged by integrating the dynamics of the floating bushingbearing with the variation of the characteristic parameters (loss coefficients). Finally, the finalmodel was experimentally validated both in laboratory and field tests by assembling the pump ina drilling machine to drive the auxiliary movements. The novelty of this article is the conceptionand construction of a simple and experimentally validated tool for the study of a gear pump, whichrelates its macroscopic behavior as a black box (defined by the loss coefficients) to the internal changesof the unit (defined by its internal lubrication)