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Frontiers of Information Technology & Electronic Engineering 2017年第10期18卷 1624-1634页

作者： Xiong-bin PENG Guo-fang GONG Hua-yong YANG Hai-yang LOU Wei-qiang WU Tong LIU State Key Laboratory of Fluid Power Transmission and Control Zhejiang University College of Engineering Shantou University

For the primary mirror of a large-scale telescope, an electro-hydraulic position control system(EHPCS) is used in the primary mirror support system. The EHPCS helps the telescope improve imaging quality and requires a micron-level position control capability with a high convergence rate, high tracking accuracy, and stability over a wide mirror cell rotation region. In addition, the EHPCS parameters vary across different working conditions, thus rendering the system nonlinear. In this paper, we propose a robust closed-loop design for the position control system in a primary hydraulic support system. The control system is synthesized based on quantitative feedback theory. The parameter bounds are defined by system modeling and identified using the frequency response method. The proposed controller design achieves robust stability and a reference tracking performance by loop shaping in the frequency domain. Experiment results are included from the test rig for the primary mirror support system, showing the effectiveness of the proposed control design.

关键词： Large-scale reflecting telescope quantitative feedback theory Electro-hydraulic position control system Micron-level position control capability System identification Robust stability

QFT control based on zero phase error compensation for flight simulator

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Journal of Systems Engineering and Electronics 2007年第1期18卷 125-131页

作者： Liu Jinkun He Yuzhu Dept. of Automatic Automatic Control Beijing Univ. of Aeronautics and Astronautics Beijing 100083 E R. China Dept. of Engineering System of Engineering Beijing Univ. of Aeronautics and Astronautics Beijing 100083 E R. China

To improve the robustness of high-precision servo systems, quantitative feedback theory （QFT） which aims to achieve a desired robust design over a specified region of plant uncertainty is proposed. The robust design problem can be solved using QFT but it fails to guarantee a high precision tracking. This problem is solved by a robust digital QFT control scheme based on zero phase error （ZPE） feed forward compensation. This scheme consists of two parts： a QFT controller in the closed-loop system and a ZPE feed-forward compensator. Digital QFT controller is designed to overcome the uncertainties in the system. Digital ZPE feed forward controller is used to improve the tracking precision. Simulation and real-time examples for flight simulator servo system indicate that this control scheme can guarantee both high robust performance and high position tracking precision.

关键词： quantitative feedback theory Zero phase error Feed forward compensation Servo system Flight simulator

Design and Experiments of Model-free Compound Controller of Flight Simulator

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Chinese Journal of Aeronautics 2009年第6期22卷 644-648页

作者： Guo Zhifu Cao Jian Zhao Keding School of Mechatronic Engineering Harbin Institute of Technology Harbin 150001 China

A model-flee compound controller design method is proposed to achieve the wide frequency bandwidth requirement of flight simulators. The method based on quantitative feedback theory, acquires system uncertainty under different working conditions through closed-loop identification with power spectrum estimation. Then in controller designing, it makes a trade, off between the strict requirements for magnitude-frequency characteristics and those for phase-frequency characteristics of flight simulators, by converting the indices of magnitude-frequency characteristics of flight simulators into quantitative feedback theory-based tracking specification bounds and using feedforward controller to attain the required phase-flequency characteristics. Simulation and experimental results indicate that, when used to design inner flame controller of flight simulator, the proposed method can fulfill the requirements for wide frequency bandwidth indices. Compared with other controller design methods, it has the property of model-free and transparency.

关键词： model-free quantitative feedback theory power spectrum estimation flight simulators closed-loop system identification

QFT preflter design for multivariable systems using interval constraint satisfaction technique

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控制理论与应用（英文版） 2013年第4期11卷 529-537页

作者： Mukesh D.PATIL P.S.V.NATARAJ Department of Electronics Engineering Ramrao Adik Institute of Technology Systems and Control Engineering Indian Institute of Technology Bombay

In this paper, a computationally efficient method is proposed for automated design of the prefilters for multivariable systems. In quantitative feedback theory （QFT） method, proposed by Horowitz, the prefilter is designed to achieve the desired tracking specifications. In the proposed approach, we pose the prefilter design problem as an interval constraint satisfaction problem and solve it using the well-established interval constraint satisfaction techniques. The proposed method finds optimal values of the parameters of fixed structure prefilter within the initial search domain. An approach based on prefilter synthesis for single-input single-output is already developed. The purpose of this paper is to extend this approach to QFT prefilter design for general multivariable systems. To validate the above design approach, we applied the method to a laboratory setup of magnetic levitation system.

关键词： Interval constraint satisfaction technique Prefilter design quantitative feedback theory

Design of Flight Control System for Tiltrotor Conversion Using QFT 26th

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Design of Flight Control System for Tiltrotor Conversion Usi...

第26届中国控制与决策会议

作者： Lu Ke Wang Zhengzhong Cheng Qiyou National Key Laboratory of Rotorcraft Aeromechanics CHRDI

ISBN: (纸本)9781479937097

quantitative feedback theory（QFT） is a robust control design method. QFT quantitatively mirror the system uncertainty and design performance target to the Nichols chart, so the designed control system could ensure the performance. Due to the parameter uncertainty in tiltrotor conversion process, using QFT method design the flight control system for tiltrotor conversion. Simulation shows that the controller has a good robust performance.

关键词： quantitative feedback theory Tiltrotor Flight Control system

大摩擦情况下三轴飞行模拟转台QFT鲁棒控制器的设计(英文)

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Chinese Journal of Aeronautics 2004年第1期17卷 34-38页

作者：刘金琨尔联洁 Department of Automatic Control Beijing University of Aeronautics and Astronautics

The 3-axis flight table is an important device and a typical high performanceposition and speed servo system used in the hardware-in-the-loop simulation of flight controlsystem. Friction force and uncertainty are the main characteristics in the 3-axis flight table servosystem. Based on the description of dynamic and static model of a nonlinear Stribeck frictionmodel, and taking account of the practical uncertainties of 3-axis flight table servo system, theQFT controller is designed. Simulation and realtime results are presented.

关键词： quantitative feedback theory 3-axis flight table friction model robustcontrol

Study on Cross-Coupled Synchronization Controller Design Method Based on QFT of Hydraulic Flight Simulator

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Study on Cross-Coupled Synchronization Controller Design Met...

第三十届中国控制会议

作者： ZHANG Biao,DONG Yanliang,GUO Zhifu,ZHAO Keding Harbin Institute of Technology,Harbin 150001,P.R.China

＜正＞Cross-coupled synchronization controller design method based on quantitative feedback theory（QFT） is proposed to deal with dual hydraulic motor driven problem of flight *** method uses frequency characteristic sets（plant templates） of two motors with given operating point extent as its system plant,and utilizes QFT SISO controller design process and MIMO stability conditions to synthesize forward controller and coupled controller ***-forward controller is also designed to fulfill frequency width index of flight *** results of flight simulator middle frame indicate that controllers designed with proposed method could satisfy frequency bandwidth and synchronization error performance requirements.

关键词： Flight Simulator Cross-Coupled Synchronization quantitative feedback theory

Fractional order QFT controller for non-minimum phase hydro power plant

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Fractional order QFT controller for non-minimum phase hydro ...

第24届中国控制与决策会议

作者： Li Meng 1,2 , Dingy Xue 1 1. Information Science and Engineering Department, Northeastern University, Shenyang 110004, P R China2. Information Engineering Department, Shenyang University, Shenyang 110044, P R China

This paper presents a robust fractional order controller for non-minimum phase hydro power plants using quantitative feedback theory （QFT） based on automatic loop-shaping. In this work, a fractional-order compensator, with a flexible controller structure, is introduced into the QFT design to give a better approximation of optimum open loop in Nichols. It has been demonstrated that the fractional order controller can provide smaller high frequency gain than the integer order controller due to its extra tunable parameters.

关键词： Hydro Power Plant Load Frequency Control quantitative feedback theory Fractional Order Control

QFT Controller Design for DDEH Servo Rocket Rudder

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QFT Controller Design for DDEH Servo Rocket Rudder

2009中国控制与决策会议

作者： SU wenhai~1,JING jihai~1 LIU Tao ~2 1.Harbin Institute of Technology,Harbin,Heilongjiang,150001,Republic of Chin School of Automobile Engineering,Harbin Institute of Technology,Weihai,264209,China

＜正＞Aiming at the rapidity control problem of Direct Drive Electro-Hydraulic（DDEH） servo rocket rudder,a design method of quantitative feedback theory（QFT） controller with friction torque dynamic compensation is *** QFT controller is introduced to solve the problem of the uncertain parameter and external disturbances of the *** creating the DDEH servo rocket rudder’s model,the controller was designed based on QFT,in which the input pre-filter transfer function F（s） and proper controller G（s） are *** simulation results show that the proposed method has good control performance to attenuate the parameters perturbation and external disturbance, enhances systemic robust performance and unknown disturbance can also be greatly compensated.

关键词： Rocket Rudder quantitative feedback theory Direct Drive Electro-Hydraulic mathematical model Robust control unknown disturbance

Design of Fractional-order QFT Controllers for Unstable Plants Based on Automatic Loop Shaping

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Design of Fractional-order QFT Controllers for Unstable Plan...

第24届中国控制与决策会议

作者： Li Meng 1,2 , Dingy Xue 1 1. Information Science and Engineering Department, Northeastern University, Shenyang 110004, P R China2. Information Engineering Department, Shenyang University, Shenyang 110044, P R China

This paper introduces a quantitative robust fractional order controller designing applicable to the unstable plant. The plant is with only one unstable pole. In this work, the main idea consists in the study of the fractional-order compensator, which gives singular properties to automatically shape the open loop gain function in Nichols by using a minimum set of parameters. The fractional order controller is designed for not only minimum phase system but also uncertain non-minimum phase and unstable plants in QFT. It has been demonstrated that the fractional order controller can provide smaller high frequency gain than the integer order controller due to its extra tunable parameters. An automatic loop-shaping based on Particle Swarm Optimization （PSO） is developed and employed in quantitative feedback theory （QFT）.

关键词： Fractional Order Control quantitative feedback theory Non-minimum Phase Plant Automatic Loop Shaping