抄録
Pump dynamic response, the speed in which a pump can build up pressure due to disturbance, system flow demand, is one of its most important characteristics. In high performance hydraulic control systems, normally we utilize a fast response, but expensive, variable displacement pressure compensated Piston Pump. Inexpensive Vane Pumps cannot be used because their very poor dynamic behavior, which is inherent from their construction and principle of operation. In this paper we apply Control Theory to analyze and investigate vane pumps and consequently suggest a possible redesign to improve their dynamic response. Performing stability, disturbance and speed of response analysis reveals that pump dynamic behavior is dominated by the parameter ratio Bvf/Ksp (Bvf-viscous coefficient, Ksp-spring constant). Upon completion of our study, we carried out a quantitative calculation of those parameters for a specific re-designed vane pump. In the re-designed vane pump speed of response was improved by factor of 35 and can now be used in high performance hydraulic servo systems, where high bandwidth is required.
