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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)

Trajectory linearization control of an aerospace vehicle based on RBF neural network

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Journal of Systems Engineering and Electronics 2008年第4期19卷 799-805页

作者： Xue Yali Jiang Changsheng coll. of Automation Nanjing Univ. of Aeronautics and Astronautics Nanjing 210016 P. R. China

An enhanced trajectory linearization control （TLC） structure based on radial basis function neural network （RBFNN） and its application on an aerospace vehicle （ASV） flight control system are presensted. The influence of unknown disturbances and uncertainties is reduced by RBFNN thanks to its approaching ability, and a robustifying itera is used to overcome the approximate error of RBFNN. The parameters adaptive adjusting laws are designed on the Lyapunov theory. The uniform ultimate boundedness of all signals of the composite closed-loop system is proved based on Lyapunov theory. Finally, the flight control system of an ASV is designed based on the proposed method. Simulation results demonstrate the effectiveness and robustness of the designed approach.

关键词： adaptive control trajectory linearization control radial basis function neural network aerospace vehicle.

Improved hybrid position/force controller design of a flexible robot manipulator using a sliding observer

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Journal of Systems Engineering and Electronics 2009年第1期20卷 146-158页

作者： Farooq M Wang Daobo Dar N. U coll. of Automation Engineering Nanjing Univ. of Aeronautics & Astronautics Nanjing 210016 P. R. China coll. of Mechanical Engineering Univ. of Engineering and Technology Taxila Pakistan

An improved hybrid position/force controller design of a flexible robot manipulator is presented using a sliding observer. The friction between the end effector and the environment is considered and compensated. For systematic reasons the controller is designed taking into consideration the rigid link subsystems and the flexible joints. The proposed control system satisfies the stability of the two subsystems and copes with the uncertainty of robot dynamics. A sliding observer is designed to estimate the time derivative of the torque applied as input to the rigid part of the robot. For the stability of the observer, it is assumed that the uncertainty of the observed system is bounded. A MRAC algorithm is used for the estimation of the friction forces at the contact point between the end effector and the environment. Finally simulation and experimental results are given, to demonstrate the effectiveness of the proposed controller.

关键词： force control sliding control Lyapunov stability robot end effector friction force.

Robust fault detection for a class of nonlinear network control system with communication delay

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Journal of Systems Engineering and Electronics 2009年第5期20卷 1024-1030页

作者： Ai Qiangyu Liu Chunsheng Jiang Bin coll. of Automation Engineering Nanjing Univ. of Aeronautics and Astronautics Nanjing 210016 P. R. China

To investigate a class of nonlinear network control system, a robust fault diagnosis method is presented based on the robust state observer. To access the objective that the designed robust filter is maximally tolerant to disturbances and sensitive to fault, the robustness and stability properties of the fault diagnosis scheme are established rigorously. Using the residual vector, a fault tolerant controller is established in order to guarantee the stability of the closed-loop system, and the controller law can be obtained by solving a set of linear matrix inequalities. Then, some relevant sufficient conditions for the existence of a solution are given by applying Lyapunov stability theory. Finally, a simulation example is performed to show the effectiveness of the proposed approach.

关键词： nonlinear network control systems robust fault detection observer linear matrix inequality.

Study on the extending multi-attribute decision model of grey target

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Journal of Systems Engineering and Electronics 2009年第5期20卷 985-991页

作者： Wang Zhengxin Dang Yaoguo Wei Jing Yang Hu coll. of Economics and Management Nanjing Univ. of Aeronautics and Astronautics Nanjing 210016 P. R. China

Based on the distance of interval numbers and the two-stage decision methods, this paper expands the decision model of grey target into some situation under which the decision information and target weights are the interval numbers at the same time. It also gives the optimization method of weights in the grey target. We get the optimum coordinated vector utilizing the combination assigning method, based on the local optimization of various schemes. So it can shift the weights of interval number into real number form and sequence it according to the weighted off-target distance. Finally the effectiveness and practicality of the model is proved by a real project.

关键词： grey system interval number grey target decision optimization.

Using genetic/simulated annealing algorithm to solve disassembly sequence planning

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Journal of Systems Engineering and Electronics 2009年第4期20卷 906-912页

作者： Wu Hao Zuo Hongfu coll. of Civil Aviation Nanjing Univ. of Aeronautics and Astronautics Nanjing 210016 P. R. China

Disassembly sequence planning （DSP） plays a significant role in maintenance planning of the aircraft. It is used during the design stage for the analysis of maintainability of the aircraft. To solve product disassembly sequence planning problems efficiently, a product disassembly hybrid graph model, which describes the connection, non-connection and precedence relationships between the product parts, is established based on the characteristic of disassembly. Farther, the optimization model is provided to optimize disassembly sequence. And the solution methodology based on the genetic/simulated annealing algorithm with binaxy-tree algorithm is given. Finally, an example is analyzed in detail, and the result shows that the model is correct and efficient.

关键词： disassembly sequence planning disassembly hybrid graph connection matrix precedence matrix binary-tree algorithms simulated annealing algorithm genetic algorithm.

Research on evaluations of several grey relational models adapt to grey relational axioms

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Journal of Systems Engineering and Electronics 2009年第2期20卷 304-309页

作者： Xie Naiming Liu Sifeng coll. of Economic & Management Nanjing Univ. of Aeronautics and Astronautics Nanjing 210016 P. R. China

Grey relational analysis is an important part of the grey systems theory, and it is the basis of the grey clustering analysis, grey decision-making and grey controlling. To research whether grey relational models satisfy the four grey relational theorems, several kinds of grey relational models are commented. Some problems including the properties of normality, pair symmetry and wholeness are discussed. The phenomenon that the lower value of almost each grey relational model is not equal to zero is proved. The contradiction problems between the properties of wholeness and pair symmetry are verified. Finally, several propositions are constructed to explain the above problems.

关键词： grey relational analysis grey system normality whole symmetry

Delay-independent robust guaranteed-cost control for uncertain linear neutral systems

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Journal of Systems Engineering and Electronics 2007年第4期18卷 858-864页

作者： Li Hongfei Zhou Jun coll. of astronautics Northwestern Polytechnical Univ. Xi'an 710072 P. R. China Dept. of Mathematics Yulin Coll. Yulin 719000 P. R. China

This article concerns the delay-independent guaranteed-cost control problem via memoryless state feedback for a class of neutral-type systems with structural uncertainty and a given quadratic cost function. New delay-independent conditions for the existence of the guaranteed-cost controller are presented in the term of LMIs. An algorithm involving optimization is proposed to design a controller achieving an optimal guaranteed-cost, such that, the system can be stabilized for all admissible uncertainties. A numerical example is provided to illustrate the feasibility of the proposed method.

关键词： neutral system guaranteed cost control LMI method delay-independent

Research on consistency measurement and weight estimation approach of hybrid uncertain comparison matrix

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Journal of Systems Engineering and Electronics 2008年第6期19卷 1145-1150页

作者： Zhu Jianjun Zhu Ningning Liu Sifeng Li Tao Wang Hehua coll. of Economics and Management Nanjing Univ. of Aeronautics and Astronautics Nanjing 210016 P. R. China

The consistency measurement and weight estimation approach of the hybrid uncertain comparison matrix in the analytic hierarchy process （AHP） are studied. First, the decision-making satisfaction membership function is defined based on the decision making＇s allowable error. Then, the weight model based on the maximal satisfactory consistency idea is suggested, and the consistency index is put forward. Moreover, the weight distributing value model is developed to solve the decision making misleading problem since the multioptimization solutions in the former model. Finally, the weights are ranked based on the possibility degree approach to obtain the ultimate order.

关键词： analytic hierarchy process, uncertainty hybrid comparison matrix, weight