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<p>This paper presents theoretical considerations on the influence of the connection of the inflow channel with the outflow channel of the individual working chambers of the satellite mechanism on the basic operating parameters of the mechanism. The considerations were carried out for the operation of the mechanism both as a pump and as a motor. The effect of controlling the inflow of individual working chambers (i.e. by connecting the inflow channel with the outflow channel of the respective working chambers – the so-called chamber ‘shut-off’) on the characteristics of the instantaneous geometric working volume of the satellite mechanism and on the value of the geometric working volume was analysed. The influence of the ‘shut-off’ of the respective working chambers on the characteristics of the operating parameters of the mechanism operating as a motor (characteristics of the pressure in the high-pressure working chambers of the mechanism and characteristics of the motor shaft speed) and operating as a pump (characteristics of the torque on the pump shaft and characteristics of the output flow rate) was analysed. Large torque and flow rate pulsations (for pump operation) and large pressure and speed pulsations (for motor operation) were found. It was also found that the ‘shut-off’ of individual working chambers leads to a radial force acting on the rotor of the mechanism and thus bending the shaft of the positive displacement machine. An arrangement of the internal channels connections is presented, in which the mechanism is statically balanced (the bending force of the shaft is zero). An arrangement of the internal channels connections is also offered, in which the minimum pulsation of operating parameters is achieved. Schemes for hydraulic systems with electrically controlled directional valves are also proposed, with which it is possible to control the liquid supply to the working chambers to achieve the desired operating parameters of both the pump (control of the flow rate) and the motor (control of the shaft speed).</p>

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Theoretical background of the satellite digital hydraulic machine

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • Pawel Sliwinski,
  • Catalin Dumitrescu

摘要

This paper presents theoretical considerations on the influence of the connection of the inflow channel with the outflow channel of the individual working chambers of the satellite mechanism on the basic operating parameters of the mechanism. The considerations were carried out for the operation of the mechanism both as a pump and as a motor. The effect of controlling the inflow of individual working chambers (i.e. by connecting the inflow channel with the outflow channel of the respective working chambers – the so-called chamber ‘shut-off’) on the characteristics of the instantaneous geometric working volume of the satellite mechanism and on the value of the geometric working volume was analysed. The influence of the ‘shut-off’ of the respective working chambers on the characteristics of the operating parameters of the mechanism operating as a motor (characteristics of the pressure in the high-pressure working chambers of the mechanism and characteristics of the motor shaft speed) and operating as a pump (characteristics of the torque on the pump shaft and characteristics of the output flow rate) was analysed. Large torque and flow rate pulsations (for pump operation) and large pressure and speed pulsations (for motor operation) were found. It was also found that the ‘shut-off’ of individual working chambers leads to a radial force acting on the rotor of the mechanism and thus bending the shaft of the positive displacement machine. An arrangement of the internal channels connections is presented, in which the mechanism is statically balanced (the bending force of the shaft is zero). An arrangement of the internal channels connections is also offered, in which the minimum pulsation of operating parameters is achieved. Schemes for hydraulic systems with electrically controlled directional valves are also proposed, with which it is possible to control the liquid supply to the working chambers to achieve the desired operating parameters of both the pump (control of the flow rate) and the motor (control of the shaft speed).