Simulation of Hydraulic Motor Performance in Hydrostatic Transmission Under Various Operational Scenarios

This thesis aims to analyze and simulate the operation of a hydraulic motor within a hydrostatic transmission, a system widely used in industrial and mobile applications for its efficiency and versatility. By utilizing advanced simulation software like Simcenter Amesim, the main components of the transmission have been modeled. The study has been focused in particular on the motor control systems, studying the performance of the hydrostatic transmission analyzing the main parameters. The study starts with a general introduction about the hydrostatic transmissions and then continues with a brief general description of hydraulic motors. Then the specific hydraulic motor used for this activity has been analyzed in detail, with particular attention to control system. After that it has been explained how the complete model of the transmission used has been assembled to perform various simulations with the software Simcenter Amesim. The first simulations have been performed simulating the circuit without a vehicle (usually an off-highway vehicle) in order to verify if the circuit and the motor controls works properly. This result has been obtained performing simulations with variable loads. The last simulations have been performed with the vehicle simulating different working conditions. First of all the vehicle on a flat ground and then analyzing the system on a slope, both positive and negative.\\ This thesis wants to highlight the advantages of this type of transmission, but also the drawbacks looking for the identification of potential areas of improvement. This research also contributes to a better understanding of the dynamics of hydraulic motors.