非对称式电液作动器研究进展

Research progress of asymmetric electro-hydraulic actuator

非对称液压缸工作时具有占用空间小、出力大、可靠性高等优点,约80%的液压系统均使用非对称液压缸。由于非对称液压缸两侧的有效作用面积不等,两腔进出口流量不相等,导致负载方向发生变化时,作动器会出现速度和压力振荡,严重影响电液作动器的可靠性与稳定性等技术指标。针对流量不对称性问题,从作动器架构和控制策略2个方面,系统、全面综述非对称式电液作动器补偿流量不对称的策略,最后提出非对称电液作动器的发展方向和展望。

Asymmetric hydraulic cylinder has the advantages of small space occupation, high power output and high reliability, about 80% of hydraulic system use asymmetric hydraulic cylinder. As the effective area on both sides of the asymmetric hydraulic cylinder is not equal, the inlet and outlet flow of the two chambers are not equal, resulting in speed and pressure oscillations when the load direction changes, which seriously affects the reliability and stability of the electro-hydraulic actuator and other technical indicators. In view of the flow asymmetry problem, the strategy of asymmetric electrohydraulic actuator to compensate the flow asymmetry is systematically and comprehensively reviewed from two aspects of actuator architecture and control strategy, and the development direction and prospect of asymmetric electrohydraulic actuator is proposed.