With the advancement of more electric aircraft(MEA)technology,the application of electro-hydrostatic actuators(EHAs)in aircraft actuation systems has become increasingly prevalent.This paper focuses on the modeling an...With the advancement of more electric aircraft(MEA)technology,the application of electro-hydrostatic actuators(EHAs)in aircraft actuation systems has become increasingly prevalent.This paper focuses on the modeling and mode switching analysis of EHA used in the primary flight control actuation systems of large aircraft,addressing the challenges associated with mode switching.First,we analyze the functional architecture and operational characteristics of multi-mode EHA,and sumarize the operating modes and implementation methods.Based on the EHA system architecture,we then develop a theoretical mathematical model and a simulation model.Using the simulation model,we analyze the performance of the EHA during normal operation.Finally,the performance of the EHA during mode switching under various functional switching scenarios is investigated.The results indicate that the EHA meets the performance requirements in terms of accuracy,bandwidth,and load capacity.Additionally,the hydraulic cylinder operates smoothly during the EHA mode switching,and the response time for switching between different modes is less than the specified threshold.These findings validate the system performance of multi-mode EHA,which helps to improve the reliability of EHA and the safety of aircraft flight control systems.展开更多
针对飞机主动侧杆系统位置控制精度不足、动态响应滞后等问题,提出了一种融合滑模变结构控制与自抗扰控制的复合控制算法。基于滑模控制律的自抗扰控制算法对控制对象的模型误差、参数波动和外部扰动具有极强的不敏感性,可以显著提升主...针对飞机主动侧杆系统位置控制精度不足、动态响应滞后等问题,提出了一种融合滑模变结构控制与自抗扰控制的复合控制算法。基于滑模控制律的自抗扰控制算法对控制对象的模型误差、参数波动和外部扰动具有极强的不敏感性,可以显著提升主动侧杆的抗干扰能力与位置控制精度。同时,针对主动侧杆系统摩擦转矩、侧杆杆体重力转矩等非线性干扰问题,通过采用降阶扩张状态观测器对系统总扰动进行估计并补偿到控制器中的方法来降低未知干扰对控制效果的影响。仿真结果表明,相较于传统线性自抗扰控制,该算法的自动回中误差降低约86%,回中时间减少12%,且能有效抵抗18 N m范围内的外部扰动力矩。此外,在加入扰动下与传统PID算法相比,改进后的主动侧杆位置控制算法跟踪误差减小了约83%,表明该控制算法在主动侧杆系统位置控制中具有更好的控制精度与抗干扰能力。展开更多
基金supported by the Chinese Civil Aircraft Project(No.MJ-2017-S49).
文摘With the advancement of more electric aircraft(MEA)technology,the application of electro-hydrostatic actuators(EHAs)in aircraft actuation systems has become increasingly prevalent.This paper focuses on the modeling and mode switching analysis of EHA used in the primary flight control actuation systems of large aircraft,addressing the challenges associated with mode switching.First,we analyze the functional architecture and operational characteristics of multi-mode EHA,and sumarize the operating modes and implementation methods.Based on the EHA system architecture,we then develop a theoretical mathematical model and a simulation model.Using the simulation model,we analyze the performance of the EHA during normal operation.Finally,the performance of the EHA during mode switching under various functional switching scenarios is investigated.The results indicate that the EHA meets the performance requirements in terms of accuracy,bandwidth,and load capacity.Additionally,the hydraulic cylinder operates smoothly during the EHA mode switching,and the response time for switching between different modes is less than the specified threshold.These findings validate the system performance of multi-mode EHA,which helps to improve the reliability of EHA and the safety of aircraft flight control systems.
文摘针对飞机主动侧杆系统位置控制精度不足、动态响应滞后等问题,提出了一种融合滑模变结构控制与自抗扰控制的复合控制算法。基于滑模控制律的自抗扰控制算法对控制对象的模型误差、参数波动和外部扰动具有极强的不敏感性,可以显著提升主动侧杆的抗干扰能力与位置控制精度。同时,针对主动侧杆系统摩擦转矩、侧杆杆体重力转矩等非线性干扰问题,通过采用降阶扩张状态观测器对系统总扰动进行估计并补偿到控制器中的方法来降低未知干扰对控制效果的影响。仿真结果表明,相较于传统线性自抗扰控制,该算法的自动回中误差降低约86%,回中时间减少12%,且能有效抵抗18 N m范围内的外部扰动力矩。此外,在加入扰动下与传统PID算法相比,改进后的主动侧杆位置控制算法跟踪误差减小了约83%,表明该控制算法在主动侧杆系统位置控制中具有更好的控制精度与抗干扰能力。
