Dynamic Inverse Compensation Method of Flow Rate Dead-zone of Electro-hydrostatic Actuator Considering Viscosity-temperatureCharacteristics of Oil

doi:10.3969/j.issn.1000-1093.2022.02.009

Abstract

Abstract: The highly integrated electro-hydrostatic actuator (EHA) has been reduced in size and weight, but the poor heat dissipation and rapid increase in system oil temperature have been brought, thus leading to the time-varying characteristics of flow rate dead-zone of EHA resulting from the reduction of oil viscosity. This makes accurate control of EHA more difficult. For the above problems, a mathematical model of EHA flow rate dead-zone is established, in which the viscosity-temperature characteristics of the oil are considered, and the variation law of flow rate dead-zone is analyzed. Furthermore, a dead-zone dynamic inverse compensation method for flow rate based on the system model information is proposed. The compensation effects of proposed method at different speeds and loads are compared and analyzed, and verified through experiment. The results show that the flow rate dead-zone of EHA increases with the rise in temperature, and the proposed dynamic inverse compensation method can compensate the flow rate dead-zone of EHA under light load conditions, which is conducive to improving the control performance of the system.

Key words: electro-hydrostaticactuator, flowratedead-zone, dynamicinversecompensationmethod, viscosity-temperaturecharacteristics

CLC Number:

TH137.31

HAN Xiaoxia, FENG Yongbao, XIE Jian, WEI Liejiang, WANG Yaqiang, WEI Xiaoling. Dynamic Inverse Compensation Method of Flow Rate Dead-zone of Electro-hydrostatic Actuator Considering Viscosity-temperatureCharacteristics of Oil[J]. Acta Armamentarii, 2022, 43(2): 316-327.

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