基于辅助输出构造的未知输入观测器设计  

Unknown input observer design based on auxiliary outputs

作　　者：朱芳来[1] 王昆[1] 韩冬[1] 

机构地区：[1]同济大学电子与信息工程学院,上海201804

出　　处：《北京航空航天大学学报》2013年第3期349-354,共6页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家自然科学基金资助项目(61074009);高等学校博士学科点专项科研基金资助项目(20110072110015);广西制造系统与先进制造技术重点实验室资助项目(PF110289);同济大学基础高等研究院基金资助项目;上海市重点学科资助项目(B004)

摘　　要：研究了观测器匹配条件不满足之前提下,状态和未知输入同时估计的未知输入观测器的设计方法.基于可测输出相对于未知输入的相关度的概念,给出了可以满足匹配条件的辅助输出的构造方法.考虑了一种高阶滑模观测器,根据原系统的可测输出不仅能给出辅助输出、还能给出其微分在有限时间内的精确估计.基于辅助输出,提出一种能对状态渐近估计的降维观测器设计方法.基于状态和辅助输出之微分的估计,提出了一种未知输入的重构方法,该方法具有不必用到系统微分信息的优点.最后通过一仿真实验验证方法的可行性.A design method of unknown input observer which is able to estimate simultaneously the sys- tem states and the unknown inputs was proposed when the observer matching condition is not satisfied. Based on the concept of relative degree with respect to unknown input, the auxiliary outputs were designed so that the newly-constructed output equation can meet the matching condition. A high-order sliding mode observer was considered to get the exact estimates of both the auxiliary outputs and their derivatives in a finite time based on the system measured outputs. Then a reduced-order observer which can asymptotically track the real states of the system was constructed. A kind of unknown input reconstruction method based on both the state and the auxiliary output derivative estimates was developed. None of system differential information has been used di- rectly when the unknown inputs was reconstructed. The simulation results to a system show that the proposed method is effective.

关 键 词：观测器匹配条件 未知输入观测器 高阶滑模观测器 

分 类 号：TP13[自动化与计算机技术—控制理论与控制工程]