To select or develop an appropriate actuator is one of the key and difficult issues in the study of semi-active controlled landing gear. Performance of the actuator may directly affect the effectiveness of semi-active...To select or develop an appropriate actuator is one of the key and difficult issues in the study of semi-active controlled landing gear. Performance of the actuator may directly affect the effectiveness of semi-active control. In this article, parallel high-speed solenoid valves are chosen to be the actuators for the semi-active controlled landing gear and being studied. A nonlinear high-speed solenoid valve model is developed with the consideration of magnetic saturation characteristics and verified by test. According to the design rule of keeping the peak load as small as possible while absorbing the specified shock energy, a fuzzy PD control rule is designed. By the rule controller parameters can be self-regulated. The simulation results indicate that the semi-active control based on high-speed solenoid valve can effectively improve the control performance and reduce impact load during landing.展开更多
针对电动汽车换挡过程的转速控制阶段存在控制器局域网络(controller area network,CAN)通信时延而导致的控制精度低、稳定性差的问题,建立了带有随机时延的驱动电机转速闭环控制数学模型,通过基于伯德图的频域分析,提出了使用分数阶PI...针对电动汽车换挡过程的转速控制阶段存在控制器局域网络(controller area network,CAN)通信时延而导致的控制精度低、稳定性差的问题,建立了带有随机时延的驱动电机转速闭环控制数学模型,通过基于伯德图的频域分析,提出了使用分数阶PID修正频响曲线的方法,提高了系统对时延的适应性.针对时延的时变性和固定参数PID性能的局限性,设计了一种基于模糊分数阶PID的驱动电机转速控制算法.仿真与台架实验结果表明,该控制算法取得了良好的控制效果.展开更多
基金Aeronautical Science Foundation of China (04B52012, 98B52023)
文摘To select or develop an appropriate actuator is one of the key and difficult issues in the study of semi-active controlled landing gear. Performance of the actuator may directly affect the effectiveness of semi-active control. In this article, parallel high-speed solenoid valves are chosen to be the actuators for the semi-active controlled landing gear and being studied. A nonlinear high-speed solenoid valve model is developed with the consideration of magnetic saturation characteristics and verified by test. According to the design rule of keeping the peak load as small as possible while absorbing the specified shock energy, a fuzzy PD control rule is designed. By the rule controller parameters can be self-regulated. The simulation results indicate that the semi-active control based on high-speed solenoid valve can effectively improve the control performance and reduce impact load during landing.
文摘针对电动汽车换挡过程的转速控制阶段存在控制器局域网络(controller area network,CAN)通信时延而导致的控制精度低、稳定性差的问题,建立了带有随机时延的驱动电机转速闭环控制数学模型,通过基于伯德图的频域分析,提出了使用分数阶PID修正频响曲线的方法,提高了系统对时延的适应性.针对时延的时变性和固定参数PID性能的局限性,设计了一种基于模糊分数阶PID的驱动电机转速控制算法.仿真与台架实验结果表明,该控制算法取得了良好的控制效果.
