In this paper we would like to present the current state of analysis and work on the activities carry out in the first year of our studies. The aim of these activities was to study the suction performance of the Gerotor pumps and it is influence on the fluid-borne noise generated. This work is presented in three levels: geometry, simulation and experimentation. The geometric study allows us to penetrate the knowledge of the trochoidal profiles and assists in the optimisation of them. The different methods of calculation and the simulations allow us to evaluate the fluid-dynamic performances and the influence of the input and output impedance. We would like to emphasize the exhaustive use of Bond Graph simulations. In the last level, the models have to contrast experimentally with the test benches that are described in this paper. Key words: trochoidal-type pumps, contact stress, photoelasticity, Bond Graph and fluid-dynamic
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