Papers by Keyword: Closed Hydraulic System

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.

Abstract: The paper obtains motor pressure, flow and speed and the engine speed curves with time by theoretically analyzing closed hydraulic system of wheel walk engineering machinery and establishes a mathematical model of the system and AMESim simulation model. The simulation curves show that in some cases the external loads react against motor and drive motor speeding and then motor outlet flow increase that leads to the pressure of low-pressure side increasing and the pressure of high-pressure side reducing. The mutation of system pressure drives bump and engine speeding that equates to the engine speed is lower than the speed corresponding to the motor flow, which is engine stall problem. The simulation results show that the basic reason of engine stall is walking condition mutation leads to motor speeding and system pressure mutation and then motor reacts against bump and engine.