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A new method for compensating phase-shifting error in phase measuring profilometry

Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) 2010年第SUPPL. 1期40卷 302-307页

作者： Zhu, Lin Da, Feipeng Gai, Shaoyan Research Institute of Automation Southeast University Nanjing 210096 China Key Laboratory of Measurement and Control of Complex Systems of Engineering of Ministry of Edu. Southeast University Nanjing 210096 China

A new phase-shifting error compensating algorithm for phase-measuring profilometry is proposed. In this error detecting algorithm, it is supposed that sinusoidal fringe is projected to the plate, thus the phase differences between adjacent pixels are equal. Three adjacent phase points are taken as the research object. Combining the principle of phase compensation measurement, each phase of the point is presented as an equation containing the phase-shifting error. According to the characteristics that the phase differences between adjacent pixels are equal, an equation to calculate the phase-shifting error is constructed. Then the phase shifting error is taken into account in the original algorithm for error compensation. Simulation results show the inhibitory effect of the error compensation by using the novel algorithm. The proposed algorithm is also used for three-dimensional reconstruction. The final result shows that the new compensation algorithm is better than the original one obviously. This error compensating algorithm can effectively improve the accuracy of three-dimensional measurement.

关键词： Error compensation

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Output feedback stabilization control for a class of nonlinear differential-algebraic-equation subsystems

Output feedback stabilization control for a class of nonline...

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Chinese control Conference (CCC)

作者： Qiang Zang Ying Zhou Kaifeng Zhang Xianzhong Dai School of Information and Control Engineering Nanjing University of Information Science & Technology Nanjing P.R.China College of Automation Nanjing University of Posts and Telecommunications Nanjing P.R.China Ministry of Education Key Laboratory of Measurement and Control of CSE (School of Automation Southeast University) Nanjing P.R.China

For nonlinear differential-algebraic equations subsystems satisfying linear growth conditions, the problem of output feedback stabilization control is considered in this paper. The design of the state observer and that of the controller are coupled. The proposed observer is non-initialized and linear which robustify the observer. Based on Backstepping approach, a linear dynamic output compensator is constructed, through which the whole closed-loop systems are asymptotically stable. The simulation results demonstrate the effectiveness of the proposed control scheme.

关键词： Observers Output feedback Large-scale systems Artificial neural networks Mathematical model Equations

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Output synchronization of multiple mobile agents

Output synchronization of multiple mobile agents

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IEEE International Conference on Networking, Sensing and control

作者： Fuxiao Tan Derong Liu Xinping Guan School of Computer and Information Sciences Fuyang Teachers College Fuyang Anhui China Key Laboratory of Complex Systems and Intelligence Science Institute of Automation Chinese Academy and Sciences Beijing China College of Electrical Engineering Yanshan University슠 Qinhuangdao Hebei China

ISBN: (纸本)9781424464500;9781424464531

In real-life, many practical applications involve agents that are nonlinear and nonholonomic. This paper investigates output synchronization of multiple mobile agents in a plane. The output synchronization of mobile agent's aims are two aspects: making the speed of each agent synchronized and tracking desired trajectories in a group. First, each agent dynamics is described by an affine control system and the communication topology among the agents is represented by a digraph. Using adjacent information and incidence matrix, a decentralized control law is acquired, which is composed of alignment control and cohesion control. Second, the stability of the group is proved by the decentralized control law and the synchronization control objective is realized. Finally, ten mobile agents are simulated to show the effectiveness of the present control law.

关键词： Mobile agents Communication system control Multiagent systems control systems Robot kinematics Trajectory Mobile communication Distributed control Mobile robots Protocols

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Behavior of a Logistic Map Driven by White Noise

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中国物理快报（英文版） 2009年第6期26卷 63-66页

作者： YANG Zheng-Ling GAO Yang GAO Yong-Tao ZHANG Jun School of Electrical Engineering and Automation Tianjin UniversityTianjin 300072 Tianjin Key Laboratory of Process Measurement and Control Tianjin300072

In the real world,every nonlinear system is inevitably affected by *** an example,a logistic map driven by white noise is *** previous studies which focused on the behavior under local parameters to find analytical results,we investigate the whole driven logistic *** a white noise driven logistic map,its nondivergent interval decreases with increasing white *** white noise does not change the equilibrium point and two-cycle intervals in statistics,if the driven logistic map is kept *** particular,chaos can be excited by white noise only after the four-cycle bifurcation *** latest result is a necessary condition which has not been given in the literature[*** 18 (2008) 509],and it can be deduced from Sharkovsky's *** simulations prove these analytical results.

关键词： No English keywords

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Adaptive control for a class of discrete-time time-delay systems with regard to delay parameter

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Journal of systems engineering and Electronics 2009年第1期20卷 159-167页

作者： Chai Lin Cheng Ming Fei Shumin Zhai Junyong Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education School of Automation Southeast Univ. Nanjing 210096 P. R. China School of eleetrics Southeast Univ. Nanjing 210096 P. R. China

The memory state feedback control problem for a class of discrete-time systems with input delay and unknown state delay is addressed based on LMIs and Lyapunov-Krasovskii functional method. Under the action of our designed adaptive control law, the unknown time-delay parameter is included in memory state feedback controller. Using LMI technique, delay-dependent sufficient conditions for the existence of the feedback controller are obtained. Finally, the effectiveness of the proposed design method is demonstrated by a numerical example.

关键词： discrete-time time-delay systems adaptive control linear matrix inequality.

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Pinning control of complex Lur’e networks

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Chinese Physics B 2009年第6期18卷 2176-2183页

作者：张庆振李忠奎 School of Automation Science and Electronic Engineering Beijing University of Aeronautics and Astronautics State Key Laboratory for Turbulence and Complex Systems College of EngineeringPeking University

This paper addresses the control problem of a class of complex dynamical networks with each node being a Lur＇e system whose nonlinearity satisfies a sector condition, by applying local feedback injections to a small fraction of the nodes. The pinning control problem is reformulated in the framework of the absolute stability theory. It is shown that the global stability of the controlled network can be reduced to the test of a set of linear matrix inequalities, which in turn guarantee the absolute stability of the corresponding Lur＇e systems whose dimensions are the same as that of a single node. A circle-type criterion in the frequency domain is further presented for checking the stability of the controlled network graphically. Finally, a network of Chua＇s oscillators is provided as a simulation example to illustrate the effectiveness of the theoretical results.

关键词： complex dynamical network Lur＇e system pinning control linear matrix inequality

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Novel dimension reduction method of gabor feature and its application to face recognition

Novel dimension reduction method of gabor feature and its ap...

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2009 2nd International Congress on Image and Signal Processing, CISP'09

作者： Xiaodong, Li Shumin, Fei Tao, Zhang Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education School of Automation South-East University Nanjing China

ISBN: (纸本)9781424441310

In order to improve the face recognition performance using Gabor wavelet, a multi-channel dimension reduction scheme (MDRS) employing PCA algorithm is proposed. In addition, the selection of scales and orientations in Gabor transformation is investigated. Different from existing dimension reduction methods which employed ensemble dimension reduction scheme (EDRS), in MDRS model, PCA algorithm is performed on total convolution results related to a certain Gabor filter to get feature vector whose dimensions are reduced. The process is repeated according to the number of other different Gabor filters. So a given face image sample has the same number of feature vectors as that of Gabor filters, and the final augmented feature vector could be derived by concatenating all these feature vectors. The experiment results in the popular face databases such as YALE and FERET demonstrate not only that the proposed method is effective but also that the traditional selection of scale and orientation is not optimal. ©2009 IEEE.

关键词： Face recognition

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Flow Rate measurement of Oil/Gas/Water Three‐Phase Flow with V‐Cone Flow Meter

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AIP Conference Proceedings 2010年第1期1207卷

作者： F. S. Zhang F. Dong Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China

Mass flow rate is an important parameter of oil/gas/water three‐phase flow, most multi‐phase flow meters are based on the measurement of total mass flow rate and phase fraction. As the Reynolds number of three‐phase flow grows to a certain number, the oil and water phase are considered as a homogenous mixture with a mixed density. In this case, oil/gas/water three‐phase flow could be measured as gas/liquid two‐phase flow. A V‐cone flow meter with beta ratio of 0.65 is used to make the mass flow rate measurement, the calibration experiment is carried out with oil/water flow, the effect of oil proportion and the mixture Reynolds number on the discharge coefficient of V‐cone flow meter is discussed. Comparison of four typical differential pressure correlations is put forward under experiment condition. Lin correlation best behaved in the experiment and error analysis is done based on it. The experiment result shows the mass flow rate of oil/gas/water flow could be measured by V‐cone flow meter efficiently and the experiment error is acceptable.

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Conductance probe for the measurement of liquid volume fraction and axial velocity in gas-liquid two phase flow

Conductance probe for the measurement of liquid volume fract...

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9th International Conference on Electronic measurement and Instruments, ICEMI 2009

作者： Shi, Yanyan Dong, Feng Tan, Chao Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China

ISBN: (纸本)9781424438624

A conductance probe which can be used to measure parameters of gas-liquid two phase flow is designed and constructed in this paper. The proposed conductance probe consists of ring electrode pairs placed on the internal wall of a cylindrical test duct and can be applied to measure the liquid volume fraction and axial velocity in horizontal pipe simultaneously. The probe electrode geometry is designed based on the method of finite element analysis so that the regions of the gas-liquid mixture that are interrogated by the probe are optimal for the parameters measurement. The performance of the conductance probe is investigated experimentally with reference to stratified, annular and bubble phase distribution. In general, static calibration shows that this geometry of conductance probe has excellent linearity. The designed conductance probe will be further tested through the multiphase flow loop and examine its validity in the future work. ©2009 IEEE.

关键词： Probes

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Gas-water two-phase flow regime recognition with data and feature fusion from a dual-plane ert system

Gas-water two-phase flow regime recognition with data and fe...

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5th International Conference on Natural Computation, ICNC 2009

作者： Tan, Chao Dong, Feng Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China

ISBN: (纸本)9780769537368

Gas-water two-phase flow is of significance in industrial process and scientific research field. Its flow regime determines the flow parameters and the method of flow measurement. Precise identification of flow regime has been a popular subject for a long time. In this work, a series experiments on gas-water two-phase flow were conducted in a 50mm diameter horizontal pipe, the flow parameters were measured with a Dual-plane Electrical Resistance Tomography (ERT) system. A method of feature extraction from the measurement data is presented and the flow regime was recognized by using a Support Vector Machine (SVM) method. Additionally, the data fusion methods are selected and compared to discuss the method of improving the flow regime recognition performance. © 2009 IEEE.

关键词： Feature extraction

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