압력보강 가변용량형 피스톤펌프의 동특성에 관한 연구 = A Study on the Dynamic Properties of a Pressure-Compensated Variable Displacement Piston Pump

다국어 초록 (Multilingual Abstract)

The pressure Compensated Variable Displacement Pump is widely used as a power supply source in hydraulic systems. This is the reason why the variable displacement pump is more power-efficient than a fixed displacement type pump. However, load control characterics of the variable pump system are deteriorated when used in a servo control of load positon or velocity, because the pump dynamics disturb the control dynamics.
Therefore, the knowledge of dynamic properities of the variable pump is very important for design and evalution of hydraulic servo systems utilizing this type pump.
In this work, the exact nonlinear 4-th order model to represent the variable pump dynamics has been derived. The dynamic properties of the pump have been investigated via computer simulation works based upon the mathematical model. For example, a variation size and regulation speed of the pump response was simulated when the pump was disturbed by a step openning of a load control valve. A series of experiments has been done for the same conditions of the theoretical computer simulation works to verify the theoretical results.
The variable pump dynamics have been found to be highly nonlinear for operating conditions and step openning sizes of the load control valve.