Modeling, simulation and experimentation of a hydrostatictransmission

Abstract

Modeling and simulation of real systems is necessary for the industry in order to improve or develop new products quickly. Simulation is less time consuming and cheaper compared with experimental testing and prototyping. Different modeling tools are on the market today. This thesis presents the results of modeling and simulation of a physical hydrostatic transmission with three different modeling tools; Simulink, SimHydraulics and SimulationX. The aim has been to get the simulations from the different models to be as similar as possible to the two measured pressures and the rotational speed of the load. The four frictional losses in the hydraulic motor have also been tried estimated in order to create a more detailed model. The SimulationX model gave the best results compared with the measurements. The largest challenge has been to simulate the model in Simulink and to find the frictional losses in the hydraulic motor by performing different tests. The solver in Simulink could not solve the equations and it was difficult to find the tests for finding two of the friction parameters.