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Combined indirect and direct method for adaptive fuzzy output feedback control of nonlinear system

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Journal of Systems Engineering and Electronics 2007年第1期18卷 120-124页

作者： Ding Quanxin chen Haitong Jiang Changsheng chen zongji Coll. of Automation Engineering Beijing Univ. of Aeronautics & Astronautics Beijing 100083 P. R. China Coll. of Automation Engineering Nanjing Univ. of Aeronautics & Astronautics Nanjing 210016 P. R. China

A novel control method for a general class of nonlinear systems using fuzzy logic systems （FLSs） is presertted. Indirect and direct methods are combined to design the adaptive fuzzy output feedback controller and a high-gain observer is used to estimate the derivatives of the system output. The closed-loop system is proven to be semiglobally uniformly ultimately bounded. In addition, it is shown that if the approximation accuracy of the fuzzy logic system is high enough and the observer gain is chosen sufficiently large, an arbitrarily small tracking error can be achieved. Simulation results verify the effectiveness of the newly designed scheme and the theoretical discussion.

关键词： Nonlinear control systems Non-affine Combined indirect and direct method Adaptive fuzzy controller High-gain observer (HGO)

Mission decision-making method of multi-aircraft cooperatively attacking multi-target based on game theoretic framework

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Chinese Journal of Aeronautics 2016年第6期29卷 1685-1694页

作者： Yao Zongxin Li Ming chen zongji Zhou Rui Shenyang Aircraft Design and Research Institute Shenyang 110035China School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100083China

Coordinated mission decision-making is one of the core steps to effectively exploit the capabilities of cooperative attack of multiple aircrafts. However, the situational assessment is an essential base to realize the mission decision-making. Therefore, in this paper, we develop a mission decision-making method of multi-aircraft cooperatively attacking multi-target based on situational assessment. We have studied the situational assessment mathematical model based on the Dempster-Shafer(D-S) evidence theory and the mission decision-making mathematical model based on the game theory. The proposed mission decision-making method of antagonized airfight is validated by some simulation examples of a swarm of unmanned combat aerial vehicles(UCAVs)that carry out the mission of the suppressing of enemy air defenses(SEAD).

关键词： Antagonized airfight D-S evidence theory Fuzzy mapping function Game theoretic framework Mission decision-making Multi-aircraft coordination Situational assessment

Nonlinear system modeling and identification of small helicopter based on genetic algorithm

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International Journal of Intelligent Computing and Cybernetics 2013年第1期6卷 45-61页

作者： Fan Yang zongji chen chen Wei School of Automation Science and Electrical Engineering Beijing University of Aeronautics and AstronauticsBeijingPeople’s Republic of China

Purpose–The purpose of this paper is to build nonlinear model of a small rotorcraft-based unmanned aerial vehicles(RUAV),using nonlinear system identification method to estimate the parameters of the *** nonlinear model will be used in robust control system design and aerodynamic ***/methodology/approach–The nonlinear model is built based on mechanism theory,aerodynamics and mechanics,which can reflect most dynamics in large flight *** algorithm(GA)and time domain flight data is adopted to estimate unknown parameters of the *** flight data were collected from a series of fight *** identification results were also analyzed and ***–The nonlinear model of RUAV has better accuracy,the parameters are physical quantities,and having distinctly recognizable *** GA is suitable for nonlinear system *** the results proved the identified model can reflect the dynamic characteristics in extensive area of flight *** limitations/implications–The GA requires much more computing power,to identify 12 unknown parameters with 30 iterations,will takes more than 18 hours of a four cores desktop *** of this is an off-line identification process,and has more accuracy,extra time is ***/value–GA method has significantly increased the accuracy of the *** previous work of system identification used a ten states linear model,and using PEM identified 23 *** carefully building the nonlinear model,it has only 21 unknown parameters,but if the model is linearized,it will get a linear model more than 35 states,which shows nonlinear model contain more dynamics than linear model.

关键词： Rotorcraft-based unmanned aerial vehicle Nonlinear system identification Genetic algorithms Aerodynamics

Formalizing the General Plant for Development of Hybrid Process Control Systems

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Journal of Systems Engineering and Electronics 1998年第1期9卷 38-47页

作者： Yang, Zhenyu chen, zongji Li, Xuandong Beijing Univ of Aero and Astro China

Many process control systems are a kind of hybrid systems. In order to develop a satisfied control strategy, i. e., to make the whole system satisfy some processing requirements, the knowledge of plant is indispensable. This paper proposes a formal model for the general plant for a kind of process control systems. Based on the model, requirements for the system can be specified from goals, and the controller can be designed according to plant based formal approach . An industrial process control system is used to illustrate our models and methods. Duration Calculus, a real time interval logic, is utilized to specify some characters of the model and development of control program for the exemplified system.

关键词： Hybrid system Process control systems Duration calculus.

HYBRID DECISION SUPPORT SYSTEM FOR RESOURCE ALLOCATION

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Chinese Journal of Aeronautics 1989年第4NO.03NO.02NO.01期 247-253页

作者： chen zongji and Zhang Minglian Beijing University of Aeronautics and Astronautics

The static resource allocation problem is studied in this paper. A model for theresource allocation problem is set up based on the information provided by harddata and soft data. The hard data is based on the cross-sectional tables from day today operation and soft data is based on the experiences of managers. Then anonlinear optimization algorithm with constraints is employed to make an optimalresource allocation *** interactive software package is developed for the hybrid decision supportsystem which is applied to the airline tickets allocation problem. An optimal ticketsallocation decision is made to result in 23% profit increase. This package can beapplied to a large group of resource allocation problems.

关键词： Pro HYBRID DECISION SUPPORT SYSTEM FOR RESOURCE ALLOCATION RESA

THE EIGENVALUE SENSITIVITY ANALYSIS AND DESIGN FOR INTEGRATED FLIGHT/PROPULSION CONTROL SYSTEM

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Chinese Journal of Aeronautics 1990年第4期5卷 277-284页

作者： Shen Gongzhang, chen zongji and Peng KemaoBeijing University of Aeronautics and Astronautics

In this paper, sensitivity approaches are taken to analyze and design an integrated flight propulsion control system where the interaction between subsystems direitly affects the stability property and handling performances of the aircraft. The eigenvalue sen sitivity approach is employed to study the effect of coupling parameters on system stability and gain sensitivity approach is used to direct the reduced states feedback suboptimal control system design. Simulation results show that the integrated flight propulsion control system designed by sensitivity approaches is of good performance.

关键词： THE EIGENVALUE SENSITIVITY ANALYSIS AND DESIGN FOR INTEGRATED FLIGHT/PROPULSION CONTROL SYSTEM Simulation

Predication-based adaptive control of a class of discrete-time nonlinear systems with nonlinear growth rate

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Science in China(Series F) 2008年第5期51卷 524-534页

作者： WEI chen chen zongji School of Automation Science and Electrical Engineer Beijing University of Aeronautics and AstronauticsBeijing 100083 China

Adaptive control of discrete-time parametric-strict-feedback nonlinear systems will be studied in this paper. To the best knowledge of the authors, almost all of the existing results for such systems need Lipschitz condition. The main purpose of this paper is to take a step towards nonlinear growth rate for second-order systems. The control law is designed based on least squares （LS） algorithms and on recursive adaptive predictors. Global stability and tracking performance are established for the closed-loop systems.

关键词： adaptive nonlinear control discrete time global stability prediction nonlinear growth rate

Least trace extended set-membership filter

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Science China(Information Sciences) 2010年第2期53卷 258-270页

作者： HUANG Yi , chen zongji & WEI chen National Key Laboratory of Science and Technology on Integrated Control Technology, School of Automation Science and Electric Engineering, Beihang University, Beijing 100083, China 1. National Key Laboratory of Science and Technology on Integrated Control Technology School of Automation Science and Electric Engineering Beihang University Beijing 100083 China

To improve the consistency of estimation result, a least-trace extended set-membership filter (LTESMF) is presented for a class of nonlinear stochastic systems, which has linear output and unknown- but-bounded noise. Feedback technique is used instead of the intersection of ellipsoid-sets in the measurement update. The feedback parameter is optimized in order to minimize the trace of error bounded ellipsoid’s envelop matrix. A new stability analysis method was developed to prove the stochastic system’s stability by using the convergence of some measurement of the error bounded ellipsoid. Analysis result shows that the estimation error of LTESMF will converge to a bounded area. A simulation of SINS/GPS integrated alignment with large misalignment angles is conducted. The results demonstrate that the convergence speed and the consistency of LTESMF are much better than those of extended Kalman filter (EKF), in addition the steady estimation precision and computational complexity are close to that of EKF.

关键词： set-membership estimation nonlinear system convergence upper bound least trace stability analysis

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基于视觉的无人作战飞机自主着陆导航方案

北京航空航天大学学报 2007年第2期33卷 159-163页

作者：陈磊陈宗基北京航空航天大学自动化科学与电气工程学院北京100083

提出了基于视觉的无人作战飞机自主着陆组合导航方案.基于视觉的自主着陆组合导航系统,可以根据视觉、惯导、高度表等传感器系统的特点,融合各机载传感器的测量信息,在不依赖外部导航信息的情况下,得到无人作战飞机(UCAV)相对于跑道的... 详细信息

提出了基于视觉的无人作战飞机自主着陆组合导航方案.基于视觉的自主着陆组合导航系统,可以根据视觉、惯导、高度表等传感器系统的特点,融合各机载传感器的测量信息,在不依赖外部导航信息的情况下,得到无人作战飞机(UCAV)相对于跑道的着陆导航信息.由于视觉信息在导航系统中的重要作用,对计算机视觉算法及其实时性进行了讨论.对如何将视觉信息与惯导、高度表信息融合,构造多速率扩展Kalman滤波器进行了阐述.通过自主开发的“UCAV自主着陆实时仿真验证平台”对该方案进行仿真,得到了满意的结果.

关键词：无人作战飞机导航系统计算机视觉 Kalman滤波自主着陆