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2009 IEEE International Workshop on Imaging systems and Techniques, IST 2009

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

ISBN: (纸本)9781424434831

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 of experiments on gas-water two-phase flows were conducted in a 50mm diameter horizontal pipe, the flow parameters were measured with an Electrical Resistance Tomography (ERT) system and a V-cone meter. A method of feature extraction from the above two instruments is presented and the flow regime was recognized by using a Support Vector Machine (SVM) method. Additionally, the feature fusion methods are selected and compared to discuss the method of improving the flow regime recognition performance. © 2009 IEEE.

关键词： Support vector machines

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Image features extraction of gas/liquid two-phase flow in horizontal pipeline by GLCM and GLGCM

Image features extraction of gas/liquid two-phase flow in ho...

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

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

ISBN: (纸本)9781424438624

Gray level co-occurrence matrix (GLCM) and the gray level-gradient co-occurrence matrix (GLGCM) were used to analyze gas/liquid flow images. Gas/liquid two-phase flow experiments were practiced and high-speed images were captured. A set of textural features were extracted from the GLCM and GLGCM. Examples of experimental results confirm the effectiveness of several features among them. All of the effective textural features have a relation with the gas/liquid density ratio, but not relate to the superficial velocity of gas or liquid. ©2009 IEEE.

关键词： Gases

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Modified Particle Filter for Object Tracking in Low Frame Rate Video

Modified Particle Filter for Object Tracking in Low Frame Ra...

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Joint 48th IEEE Conference on Decision and control and 28th Chinese control Conference

作者： Tao Zhang Shumin Fei Hong Lu Xiaodong Li the Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of EducationInstitute of AutomationSoutheast University the Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education Institute of AutomationSoutheast University School of Automation Nanjing Institute of Technology

Object tracking algorithm using modified Particle filter in low frame rate(LFR) video is proposed in this paper,which the object moving significantly and randomly between consecutive frames in the low frame rate ***,Particle filtering use motion transitions to model the movement of the ***,in object tracking with low frame rate sequences,it is very difficult to model significant random jumps of *** key notion of our solution is that using the object detection and extraction to locate the tracked object,while not using the dynamical *** propagate the sample set around the detected regions,which the samples are assumed to be uniformly distributed in the neighborhoods of the detected *** is similar to the general particle filter to propagate *** we compute the likelihood between the target model and the candidate regions,which are based on color histogram *** extensive experiments show that the proposed algorithm performs robustly in a large variety of tracking scenarios.

关键词： frame filter Modified Particle Filter for Object Tracking in Low Frame Rate Video Object Filter

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Behavior of a Logistic Map Driven by White Noise

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Chinese Physics Letters 2009年第6期26卷 65-68页

作者：杨正瓴高阳郜永涛张军 School of Electrical Engineering and Automation Tianjin University Tianjin 300072 Tianjin Key Laboratory of Process Measurement and Control Tianjin 300072

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

关键词： gamma-ray bursts gamma-rays relativity

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Scene specified control for internet-based mobile robot operation

Scene specified control for internet-based mobile robot oper...

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IEEE International Conference on Mechatronics and automation

作者： Xudong Ma Xianzhong Dai Fang Fang Ningting Cheng Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education School of Automation South East University Nanjing China

A networked mobile robot in large networks such as Internet often operates under supervisory control and the discrete commands and decisions from the remote operators normally depend on the feedback scene information. Therefore it must be tolerate of the significant and unpredicted time latency that might mislead the robot for time and scene-dependent operations. A series of strategies are presented in this paper to decrease the latency impact and implement scene specified control of a Internet-based mobile robot. Time stamps are attached to each communication packet of scene video, audio and environment information from the robot to remote operator's computer for display, which then sends back control decision or command of the right time stamps with the scene when needed. By allocating a memory buffer for current display and recent status even including video frames the robot recalls the environment with the event time stamps as searching index, which helps to estimate the exact robot position or operation. Reverse position and motion are conducted according to estimation from the memorized information. The strategies have been introduced to improve a practical networked mobile robot control platform with experiment validity given in detail.

关键词： Layout Internet Mobile robots Computer displays Delay Communication system control Auditory displays IP networks Supervisory control Feedback

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Calculation method for bubble volume in gas-liquid two-phase flow

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Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument 2009年第11期30卷 2444-2449页

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

A suit of visualized experimental device was designed. Single bubble rising in stagnant liquid in a translucent rectangular tank was studied using a high-speed video system. Bubbles generated by four orifices with different diameter (1 mm, 2 mm, 3 mm, 4 mm) were recorded respectively. Sequences of the recorded high-speed images were processed by digital image processing method. Several parameters of bubble could be obtained from the processed image, such as bubble area, equivalent diameter, geometric center, bubble velocity, bubble acceleration, and so on. Two methods for bubble volume calculation were applied. The first method is geometric method, in which the bubble volume is calculated by reconstructing an ellipsoid based on the shape of bubble in an image. Another one is force analysis method, in which the bubble volume is calculated by analyzing the forces exerted on the bubble in vertical direction, and then the formula of the bubble volume could be derived from Newton's second law. Calculation results of the two methods are analyzed and compared to illuminate the situations they adapt to. Finally, the gas volume fraction of a single bubble in its rising condition in water is calculated.

关键词： Volume fraction

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Finite-time tracking control of bank-to-turn missiles using terminalsliding mode

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ICIC Express Letters 2009年第4期3卷 1373-1380页

作者： Wang, Zhao Li, Shihua Fei, Shumin Key Laboratory of Measurement and Control of Complex Systems ofEngineering School of Automation Southeast University Nanjing 210096 China College of Information and Control Engineering China University of Petroleum Dongying 257061 China

In this paper, a finite-time controller for bank-to-turn (BTT,) missiles isdesigned based on nonsingular terminal sliding mode (NTSM,) technique. Theproposed controller allows that roll rate and angle of attack can track thedesired commands in finite-time with sideslip angle maintained in a small degreerange. Input/output (I/O) feedback linearizaiton technique is used in thecontroller design. Since the dynamics of BTT missile contains uncertainties,nonsingular terminal sliding mode control technique is applied to yield betterrobustness and disturbance rejection properties. Computer simulation results arepresented to validate the effectiveness of our method. ICIC International © 2009.

关键词： Disturbance rejection

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Flow-rate Characteristics measurement of Regulators Based on the Pressure Response in an Isothermal Tank

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Chinese Journal of Mechanical engineering 2009年第5期22卷 633-638页

作者： FAN Wei ZHANG Hongli WANG Tao PENG Guangzheng ONEYAMA Naotake Education Ministry Key Laboratory of Complex System Intelligent Control and Decision Beijing Institute of Technology Beijing 100081 China School of Automation Beijing Institute of Technology Beijing 100081 China Electrical Engineering College Xinjiang University Urumchi 830046 China SMC Tsukuba Technical Center Ibaraki-ken 300-2493 Japan

Regulators are important components in pneumatic system, and their flow-rate characteristics are the key parameters for designers. According to the correlatively international standard and national standard of China, which describe the flow-rate characteristics measurement method of pneumatic regulators, the pressure and the flow are measured point by point, and then the flow-rate characteristics curve is plotted point to point. This method has some disadvantages, such as equipment complexity, much air consumption, and low efficiency. To settle the problems presented above, this paper puts forward a new high efficient and energy saving flow-rate characteristics measurement method of regulators, which is based on the pressure response when charging and discharging to an isothermal tank without any flow meters. The measurement principle, the system and the steps are introduced. And the tracking differentiator is used for the data processing of the pressure difference. Two typical kinds of regulators were experimentally investigated, and their flow-rate characteristics curves were obtained with the new and the conventional method, respectively. Comparatively, it＇s proved that this new method is feasible because it is not only able to meet the demand of the measurement precision, but also to save energy and improve efficiency. Compared to the conventional method, the new method takes only about 1/10 amount of time and consumes about only 1/30 amount of air. Hopefully it will be able to serve as an international standard of flow-rate characteristics measurement method of regulators.

关键词： regulator flow-rate characteristics isothermal tank charging and discharging once pressure response tracking differentiator energy saving and high efficiency

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New delay-dependent stability criteria for linear stochastic systems with time-varying delay

New delay-dependent stability criteria for linear stochastic...

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Joint 48th IEEE Conference on Decision and control and 28th Chinese control Conference

作者： Jianjiang Yu Kanjian Zhang Shumin Fei the Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education School of Information Science and Technology Yancheng Teachers University the School of Automation Southeast University

In this paper, the problem of the stability for a class of stochastic systems with time-varying delay is investigated. By dividing the delay interval into multiple segments and choosing different weighting matrices in the new LyapunovKrasovskii functional, the delay-dependent sufficient criterion is derived in terms of linear matrix inequalities(LMIs). Neither model transformations nor bounding techniques for cross terms is employed, so the derived criterion is less conservative than the most existing results. Meanwhile, the computational complexity of the obtained stability conditions is reduced because less variables are involved. A numerical example is given to show the application of the proposed method.

关键词： New delay-dependent stability criteria for linear stochastic systems with time-varying delay

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Simulative measurement on Conductivity and Permeability Distribution in Sensing Field of Electromagnetic Tomography

Simulative Measurement on Conductivity and Permeability Dist...

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2009 International Conference on Measuring Technology and Mechatronics automation(ICMTMA 2009)(2009年检测技术与机械自动化国际会议)

作者： Dong Liu Feng Dong Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University TianjinChina

Electromagnetic tomography is one kind of electrical impendence tomography which develops faster in recent years. The relation map between Electromagnetic field and measuring electric potential provides adequate prior information and consequently is crucial to image reconstruction of Electromagnetic Tomography (EMT). Firstly the forward problem of EMT is studied in this paper and a new 2-D model of eight homogenous coils is set up in simulative software named COMSOL Multiphysics, finite element method (FEM) is practiced in the solution of forward problem. The simulation on characters of object position, conductivity, and permeability in sensing field is carried out and seriously analyzed. The relation between conductivity of materials and detective electric potential are discussed, revealing that material distribution is mainly presented in the real part of the electric potential. The investigation on object field of EMT is beneficial not only to future reconstruction work but also to optimum design of sensor system.

关键词： electromagnetic tomography conductivity permeability magnetic potential

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