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Design and Simulation of Flight Control System Based on LQG/LTR Method

Author: QinZuo
Tutor: ZhangWeiGuo
School: Northwestern Polytechnical University
Course: Navigation,Guidance and Control
Keywords: The reproducibility of the linear quadratic Gaussian / loop transfer Flight control Robustness Separation theorem Singular value
CLC: TP273
Type: Master's thesis
Year: 2006
Downloads: 599
Quote: 2
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Due to unmodeled dynamic characteristics will make the system unstable , such as the presence of gust sensor measurement noise interference also often leads to poor system performance , so a crowd widespread concern in the design of the control system is designed with good stability and performance robustness of the controller . Linear quadratic Gaussian / loop transfer reproducibility (LQG / LTR) is a multi- variable frequency domain design methods, the application of the method in this paper to design a robust feedback control system . The simulation results verify the analysis shows that it has good robustness and decoupling characteristics . The paper is organized as follows: the classic frequency domain robust design concept is usually applied to single-input single - output system , the paper first by reference to the concept of singular value extended to multivariable systems . Then , research Kalman filter and state feedback control law is designed to ensure that they have a very good performance ; its combination of design LQG controller based on the separation theorem . Then we expound how to apply the improved LTR method so that the the original LQG design performance can be completely reproduced . Application LQG / LTR method designed flight control system robustness . The aircraft longitudinal , lateral a typical flight mode ( pitch attitude to maintain altitude hold , vertical landing coordinated turn given course correction and lateral deviation ) for the design and simulation . Set forth specific examples of the specific design steps, in the frequency domain and the time domain to obtain a desired characteristic . Design of LQG / LTR with PID controllers were compared . Simulation results show that the LQG / LTR controller has a good performance when the system the influence of interference by the wind ; compared with the PID controller , its advantages , especially in the control under the coupling between the case in the system channel is quite obvious. At the same time , the application of the LQG / LTR method to select the parameters of the computational cost is relatively small . In the last part of the paper , the development of a good interface , easy to operate flight control law design package . Made study confirmed the LQG / LTR controller can effectively achieve the desired control requirements , provides a feasible method for the practical application of the flight control system .

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Automatic control,automatic control system
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