Abstract
With closed hydraulic transmission system at Step condition as the research object,the dynamic model of variable pump driving variable motor is established under the AMESim software to study the influence of the effective bulk modulus of fluid on coupling characteristics of the hydraulic system. The simulation results show that the greater the bulk modulus is, the smaller the pressure fluctuations and the power loss are, and the faster the motor response speed is, which instructions that reasonable choice of fluid the bulk modulus can improve the stability of the hydraulic system. This paper provides theoretical guidance for the hydraulic system design and analysis of the dynamic quality of hydraulic equipment.
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