To control the position of differential cylinder closed loop without usingany throttle elements, a flew idea that two speed variable pumps are used to compensate thenon-symmetric flow of differential cylinder is carri...To control the position of differential cylinder closed loop without usingany throttle elements, a flew idea that two speed variable pumps are used to compensate thenon-symmetric flow of differential cylinder is carried out. According to the leaking property of thesystem, a speed offset principle is also proposed to eliminate the cavitation and tension caused bythe leakage and condensation of oil, which makes the system be in the same state as a valvecontrolled circuit. This principle is explained theoretically and experimentally. Further therelationship that the pressures in cylinder chambers change with load and leakage, and therelationship between biasing speed and pre-load pressures in cylinder chambers are established. Theresearch has proved that the new system has similar technique features as those of controlled withservo valves, but due to the elimination of all the throttle lose the efficiency of system can beimproved greatly.展开更多
The time domain guideposts requirements of a pump-motor system is transfered into a series of constraints which express the robust performance upper bound and regional poles limits of the closed loop system. Then the ...The time domain guideposts requirements of a pump-motor system is transfered into a series of constraints which express the robust performance upper bound and regional poles limits of the closed loop system. Then the servo system control problem is transferred into the problem of robust performance optimizing under regional poles constrains described by linear matrix inequality （LMI）. These LMIs are easy to solve through the Matlab LMI-toolbox. Simulations indicate that the controller has excellent dynamic, static and disturbance rejection performance, and the control system is robust and has perfect H2 performance to the bounded external torque disturbance.展开更多
为降低注塑机在移模过程中的能量损失,结合伺服泵和插装阀的优势,设计了二板式注塑机移模系统并进行仿真分析。以二板式注塑机移模系统为研究对象,结合液压仿真软件AMESim和动态系统仿真软件Matlab/Simulink的优越性,建立了二板式注塑...为降低注塑机在移模过程中的能量损失,结合伺服泵和插装阀的优势,设计了二板式注塑机移模系统并进行仿真分析。以二板式注塑机移模系统为研究对象,结合液压仿真软件AMESim和动态系统仿真软件Matlab/Simulink的优越性,建立了二板式注塑机移模系统联合仿真模型,进行联合仿真分析,结果表明:由伺服电机驱动定量泵的注塑机在移模阶段总能耗为55 k J,比普通电机驱动定量泵节能27%;验证了仿真模型的正确性;为联合仿真技术在二板式注塑机设计上的应用提供借鉴。展开更多
基金This project is supported by National Natural Science Foundation of China(No.50275102) National Foundation for Abroad Return People, China (No.2001345).
文摘To control the position of differential cylinder closed loop without usingany throttle elements, a flew idea that two speed variable pumps are used to compensate thenon-symmetric flow of differential cylinder is carried out. According to the leaking property of thesystem, a speed offset principle is also proposed to eliminate the cavitation and tension caused bythe leakage and condensation of oil, which makes the system be in the same state as a valvecontrolled circuit. This principle is explained theoretically and experimentally. Further therelationship that the pressures in cylinder chambers change with load and leakage, and therelationship between biasing speed and pre-load pressures in cylinder chambers are established. Theresearch has proved that the new system has similar technique features as those of controlled withservo valves, but due to the elimination of all the throttle lose the efficiency of system can beimproved greatly.
文摘The time domain guideposts requirements of a pump-motor system is transfered into a series of constraints which express the robust performance upper bound and regional poles limits of the closed loop system. Then the servo system control problem is transferred into the problem of robust performance optimizing under regional poles constrains described by linear matrix inequality （LMI）. These LMIs are easy to solve through the Matlab LMI-toolbox. Simulations indicate that the controller has excellent dynamic, static and disturbance rejection performance, and the control system is robust and has perfect H2 performance to the bounded external torque disturbance.
文摘为降低注塑机在移模过程中的能量损失,结合伺服泵和插装阀的优势,设计了二板式注塑机移模系统并进行仿真分析。以二板式注塑机移模系统为研究对象,结合液压仿真软件AMESim和动态系统仿真软件Matlab/Simulink的优越性,建立了二板式注塑机移模系统联合仿真模型,进行联合仿真分析,结果表明:由伺服电机驱动定量泵的注塑机在移模阶段总能耗为55 k J,比普通电机驱动定量泵节能27%;验证了仿真模型的正确性;为联合仿真技术在二板式注塑机设计上的应用提供借鉴。
