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
针对具有参数不确定性、不匹配和匹配的时变扰动的电液执行器(electro‑hydraulic actuator,EHA)系统,提出了一种渐近跟踪控制策略.首先,构造了一个扩展状态观测器(extended state observer,ESO)获得对不匹配时变扰动的精确估计及补偿;该...针对具有参数不确定性、不匹配和匹配的时变扰动的电液执行器(electro‑hydraulic actuator,EHA)系统,提出了一种渐近跟踪控制策略.首先,构造了一个扩展状态观测器(extended state observer,ESO)获得对不匹配时变扰动的精确估计及补偿;该ESO通过在经典ESO中引入鲁棒自适应项,得到了渐近估计结果,降低了鲁棒增益选择的保守性.然后,设计一个鲁棒自适应项来估计匹配扰动的上界,以消除匹配时变扰动的影响.此外,自适应律用于估计参数不确定性.通过李雅普诺夫稳定性理论证明了跟踪误差能渐近收敛至零.最后,通过仿真和实验验证了所提控制策略的有效性.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.
文摘针对具有参数不确定性、不匹配和匹配的时变扰动的电液执行器(electro‑hydraulic actuator,EHA)系统,提出了一种渐近跟踪控制策略.首先,构造了一个扩展状态观测器(extended state observer,ESO)获得对不匹配时变扰动的精确估计及补偿;该ESO通过在经典ESO中引入鲁棒自适应项,得到了渐近估计结果,降低了鲁棒增益选择的保守性.然后,设计一个鲁棒自适应项来估计匹配扰动的上界,以消除匹配时变扰动的影响.此外,自适应律用于估计参数不确定性.通过李雅普诺夫稳定性理论证明了跟踪误差能渐近收敛至零.最后,通过仿真和实验验证了所提控制策略的有效性.
