In this paper, a practical decoupling control scheme for fighter aircraft is proposed to achieve high angle of attack(AOA)tracking and super maneuver action by utilizing the thrust vector technology. Firstly, a six de...In this paper, a practical decoupling control scheme for fighter aircraft is proposed to achieve high angle of attack(AOA)tracking and super maneuver action by utilizing the thrust vector technology. Firstly, a six degree-of-freedom(DOF) nonlinear model with 12 variables is given. Due to low sufficiency of the aerodynamic actuators at high AOA, a thrust vector model with rotatable engine nozzles is derived. Secondly, the active disturbance rejection control(ADRC) is used to realize a three-channel decoupling control such that a strong coupling between different channels can be treated as total disturbance, which is estimated by the designed extended state observer. The control surface allocation is implemented by the traditional daisy chain method. Finally,the effectiveness of the presented control strategy is demonstrated by some numerical simulation results.展开更多
Suffering from actuator failure and complex sideslip angle,the motion control of a sailboat becomes challenging.In this paper,an improved double finite-time observer-based line-of-sight guidance and finite-time contro...Suffering from actuator failure and complex sideslip angle,the motion control of a sailboat becomes challenging.In this paper,an improved double finite-time observer-based line-of-sight guidance and finite-time control(IDFLOS-FC)scheme is presented for path following of sailboats.The salient features of the proposed IDFLOS-FC scheme are as follows:(1)Considering the problem of actuator failure,an actuator failure model is introduced into the dynamics model of a sailboat.(2)The time-varying sideslip angle of the sailboat is accurately observed by the double finite-time sideslip observers(DFSOs),which reduces the error in line-of-sight(LOS)guidance.(3)A radial basis function(RBF)neural network is used to fit the uncertainty of the model,and the upper bound of the sum of fault effects and external disturbances is estimated based on adaptive theory,so that the controller has accurate tracking and interference suppression.(4)According to the Lyapunov method,the system is finite-time stable.Finally,simulation was used to validate the effectiveness of the method.展开更多
为实现导弹以一定落角攻击装甲车辆等地面移动目标,应用变结构控制理论,推导基于偏置比例导引的落角约束滑模制导律,并基于李雅普诺夫稳定性理论设计了参数自适应的幂次趋近律。考虑目标速度难以测量的问题,引入扩张状态观测器(extended...为实现导弹以一定落角攻击装甲车辆等地面移动目标,应用变结构控制理论,推导基于偏置比例导引的落角约束滑模制导律,并基于李雅普诺夫稳定性理论设计了参数自适应的幂次趋近律。考虑目标速度难以测量的问题,引入扩张状态观测器(extended states observer,ESO)对目标速度进行估计。仿真结果表明,所设计的制导律能够以要求的落角准确打击静止目标与机动目标,且需用法向过载和命中点附近的法向过载较小,弹道后段较为平直。展开更多
基金supported by the National Natural Science Foundation of China(61973175,61973172)。
文摘In this paper, a practical decoupling control scheme for fighter aircraft is proposed to achieve high angle of attack(AOA)tracking and super maneuver action by utilizing the thrust vector technology. Firstly, a six degree-of-freedom(DOF) nonlinear model with 12 variables is given. Due to low sufficiency of the aerodynamic actuators at high AOA, a thrust vector model with rotatable engine nozzles is derived. Secondly, the active disturbance rejection control(ADRC) is used to realize a three-channel decoupling control such that a strong coupling between different channels can be treated as total disturbance, which is estimated by the designed extended state observer. The control surface allocation is implemented by the traditional daisy chain method. Finally,the effectiveness of the presented control strategy is demonstrated by some numerical simulation results.
基金supported by the National Natural Science Foundation of China(Nos.52271306,52025111,and 51939003)the Central Guidance on Local Science and Technology Development Fund(No.2023JH6/100100010)the Fundamental Research Funds for the Central Universities(No.3132023501),China.
文摘Suffering from actuator failure and complex sideslip angle,the motion control of a sailboat becomes challenging.In this paper,an improved double finite-time observer-based line-of-sight guidance and finite-time control(IDFLOS-FC)scheme is presented for path following of sailboats.The salient features of the proposed IDFLOS-FC scheme are as follows:(1)Considering the problem of actuator failure,an actuator failure model is introduced into the dynamics model of a sailboat.(2)The time-varying sideslip angle of the sailboat is accurately observed by the double finite-time sideslip observers(DFSOs),which reduces the error in line-of-sight(LOS)guidance.(3)A radial basis function(RBF)neural network is used to fit the uncertainty of the model,and the upper bound of the sum of fault effects and external disturbances is estimated based on adaptive theory,so that the controller has accurate tracking and interference suppression.(4)According to the Lyapunov method,the system is finite-time stable.Finally,simulation was used to validate the effectiveness of the method.
文摘为实现导弹以一定落角攻击装甲车辆等地面移动目标,应用变结构控制理论,推导基于偏置比例导引的落角约束滑模制导律,并基于李雅普诺夫稳定性理论设计了参数自适应的幂次趋近律。考虑目标速度难以测量的问题,引入扩张状态观测器(extended states observer,ESO)对目标速度进行估计。仿真结果表明,所设计的制导律能够以要求的落角准确打击静止目标与机动目标,且需用法向过载和命中点附近的法向过载较小,弹道后段较为平直。
