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Various Methods for Modified Projective Synchronization of Liu system and the New Lorenz System

Various Methods for Modified Projective Synchronization of L...

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第24届中国控制与决策会议

作者： Dongyi Yang 1 , Wuneng Zhou 1 , Siming Ma 1 , Xuan Li 1 1. College of Information Science and Technology, Donghua University, Shanghai 201620, China

In this paper, we mainly concern the synchronization of Liu hyperchaotic system and the new Lorenz hyperchaotic system. Within the two systems, we achieve the modified projective synchronization （MPS） and adaptive modified projective synchronization （AMPS）. In addition, based on the Lyapunov stability theory, the adaptive modified projective dislocated synchronization （AMPDS） is proposed, which realizes the projective dislocated synchronization between two systems with uncertain parameters. Numerical examples are given to show the feasibility and effectiveness of these methods.

关键词： Hyperchaotic Projective Synchronization active control Uncertain Parameter Dislocated

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Photography Constraint Aided Keyframe Selection and Matching Method for UAV 3D Reconstruction

Photography Constraint Aided Keyframe Selection and Matching...

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第30届中国控制与决策会议

作者： Cheng Zhang Hongpeng Wang Shubao He Hanzhen Li Jingtai Liu Institute of Robotics and Automatic Information System NanKai University Tianjin Key Laboratory of Intelligent Robotics

The use of visual methods to explore the terrain in the wild has drawn more and more attention. Structure from motion techniques have been extensively employed to 3 D topographic reconstruction from videos. Conventional3 D reconstruction of the large scene area requires the aircraft to carry the camera to photograph, but need a lot of time. As a result, it needs to plan the keyframes and matching. In this paper, a keyframe matching topological graph selection strategy is proposed for effective 3 D reconstruction. First, plan the scene traversal photographic mode by Terrain elevation information. A photography constraint method, which conforms to the orthographic and equidistant projection, is proposed. After that, the selection of the key frame is performed using the planning information and the DEM information. Finally, establish the matching relationships between the frames. We verify the efficacy of our method on a mountain terrain, and demonstrate that our method is able to greatly reduce the reconstruction time and improve the reconstruction accuracy.

关键词： 3D Reconstruction Coverage Path Planning Keyframe Topological Graph active control

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Synchronization of Energy Resource System via active Sliding Mode controller

Synchronization of Energy Resource System via Active Sliding...

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2010 Chinese control and Decision Conference

作者： Ning Sun,Huaguang Zhang,Zhiliang Wang,Lili Cui School of Information Science and Engineering,Northeastern University,Shenyang,110004

＜正＞In this paper,the chaos synchronization problem for energy resource demand-supply system（which is called as energy resources system in short） is ***,a nonlinear controller is designed via the active theory and sliding mode ***,the existence of the sliding mode is discussed based on the Lyapunov stability theorem and the stability criterion of linear *** the end,numerical simulations are performed to demonstrate the effectiveness of the proposed control strategy.

关键词： Energy Resource System Synchronization active control Sliding Mode control(SMC)

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IMC control of Combustion Instability

IMC Control of Combustion Instability

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第二十七届中国控制会议

作者： Fu Caifen,Tan Wen,Liu Jizhen Department of Automation Key Laboratory of Condition Monitoring and control for Power Plant Equipment(Ministry of Education) North China Electric Power University,Beijing 102206,P.R.China

Combustion instability is a phenomenon that happens in a gas turbine when the lean premixed combustion mode is used to reduce the NOx *** process is unstable and thus difficult to *** paper applies the internal model control（IMC） method in the control of the combustion instability,with the aim of finding effective control structures and methods for this kind of system,and preparing for the study of wide-range robust *** results show that the IMC controller has good disturbance rejection capability,but the method should be improved to achieve better performance for the active control of combustion instability.

关键词： Combustion instability IMC active control

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Optimization and Analysis of Hybrid Laminar Flow control Wings Based on Infinite Span Wings

Optimization and Analysis of Hybrid Laminar Flow Control Win...

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2016年航空科学与技术全国博士生学术论坛

作者： Yang Tihao Bai Junqiang Shi Yayun Northwestern Polytechnical University

The optimizations of hybrid laminar flow control（HLFC） wings are parametrically studied with variations in sweep angles, different coefficients and different Reynolds number. The influence of transition induced by crossflow has been included. A CFD solver with the linear stability theory code has been implemented and coupled into an optimization framework. The comparison between the computational results and the experiment data of NLF（2）-0415 wing proves that the transition model is capable of predicting accurate transition location. Then, HLFC wings are optimized with target of minimum drag. Design results shown that, large leading edge sweep angles and high value of the Reynolds number accelerate the instability of CF and TS disturbance waves. But suction control can efficient suppress the development of disturbance waves near theleading edge. And laminar flow can be obtained with suitable pressure distributions. The best pressure distributions have a gentle negative pressure gradient near the leading edge and a small favorable pressure gradient behind it. Nose down pitching moment coefficients may limit the further extending of laminar flow. The optimum HLFC wing with minimum drag coefficients is a balance of friction drag, pressure drag and trim drag.

关键词： Hybrid laminar flow control Optimization design active control Transonic flow FFD

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高超声速飞行器机翼颤振的模糊主动控制研究

高超声速飞行器机翼颤振的模糊主动控制研究

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中国航天第三专业信息网第三十八届技术交流会暨第二届空天动力联合会议

作者：许睿陈玉波苑云火箭军研究院

颤振是飞行器气动弹性力学中的重要现象,也是威胁高超声速飞行器结构安全的重要问题。本文首先建立了高超声速二元机翼模型,并将其转换为状态方程形式,然后针对该模型设计了两输入单输出的模糊控制器。控制器以机翼的颤振角位移和速度... 详细信息

颤振是飞行器气动弹性力学中的重要现象,也是威胁高超声速飞行器结构安全的重要问题。本文首先建立了高超声速二元机翼模型,并将其转换为状态方程形式,然后针对该模型设计了两输入单输出的模糊控制器。控制器以机翼的颤振角位移和速度为输入,通过调整控制面的偏角来实现机翼颤振控制。最后以飞行速度与颤振临界速度比分别为0.8,1.0,1.2三种工况下的仿真分析,结果表明模糊控制方法能有效控制机翼的颤振。

关键词： hypersonic airfoil flutter fuzzy control active control

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