Design and simulation of power regulator based electro-hydrostatic actuator
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摘要: 电动静液作动器是功率电传系统的执行机构,在作动器端把电能转化为局部液压能,兼具传统液压系统和直接电力驱动作动器的优点.相比阀控作动器,电动静液作动器的效率和可靠性获得提高,但是带宽和刚度受到限制,因此提出了一种基于能量调节的新型电动静液作动器.能量调节器根据不同的控制响应需求向系统提供附加流量.液压锁用于切换系统工作模式,保持液压缸的输出位置.基于能量调节器的数学方程分析,得出其容积优化原则,并对系统控制策略进行了专门的设计.仿真结果验证了系统响应速度和频宽的改善.Abstract: The electro-hydrostatic actuator(EHA) is a kind of power-by-wire actuator that converts the electrical power into local hydraulic power which combines the benefits of conventional hydraulic system and direct drive electrical actuators. Compared to the servovalve controlled actuator, the efficiency and reliability of EHA are increased. However, the frequency width and stiffness are limited. A novel structure EHA with power regulator and hydraulic lock was proposed to overcome these problems. The power regulator managed the power distribution in EHA system according to different control requirements. The hydraulic lock helped to keep the output in desired position. Based on its mathematic equations, the optimization principle of power regulator was discussed and the control strategy was specifically designed for this EHA. The simulation results verify the improvements in response and frequency width.
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Key words:
- electro-hydrostatic actuator /
- power regulator /
- transfer volume /
- hydraulic lock /
- frequency width /
- stiffness
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