ADRC for Statically Unstable Longitudinal Flight Dynamics
PD attitude control is widely used for the flight vehicles,especially in boost phase,where the dynamics are often statically unstable.An enhanced PD control scheme based on state observer compensation is presented to cope with the situation.By utilizing the measurable data,the observer allows treating the entire response of the system,with the exception of the control term as a disturbance,and to use the estimation of the disturbance to cancel-out this response and thereby to effectively simplify the control channel.The control algorithm is derived based on the linear perturbation dynamics of flight vehicles.To reduce the phase lag,a reduced-order observer is employed to simplify the proposed approach.With reasonable assumptions,a sufficient condition on selecting of key control parameters is established to guarantee closed-loop stability, which provides a guideline for control tuning.According to stability margin tester philosophy,an interactive graphical tuning methodology is explicitly presented,where both the 67.5deg phase margin law and the fixed ratio between the critical frequency and the rising time play the essential roles.Some illustrative examples are provided to validate the results.
SUN Mingwei JIAO Gangling YANG Ruiguang CHEN Zengqiang
Department of Automation,School of Information Technology,Nankai University,Tianjin 300071,P.R.China Naval Academy of Armament,Beijing 100161,P.R.China
国际会议
The 30th Chinese Control Conference(第三十届中国控制会议)
烟台
英文
1-7
2011-07-01（万方平台首次上网日期，不代表论文的发表时间）