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7th World Congress in Industrial process Tomography, WCIPT7

作者： Ren, S. Tan, C. Dong, F. Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin300072 China

ISBN: (纸本)9780853163237

Stratified two-phase flow is normal seen in many industrial applications. Measurement of the phase interfaces in it is important for the optimization of many industrial processes. In the paper, a shape reconstruction method is proposed for the direct reconstruction of phase interfaces in stratified two-phase flow using electrical capacitance tomography (ECT). The proposed method is mainly based on the Bézier presentation of the phase interface and the cornice boundary integral formulization of the forward problem of ECT. Numerical simulations show that the proposed method can reconstruct the interfacial configuration in stratified flow with good accuracy and high convergence. © 2014 International Society for Industrial process Tomography.

关键词： Boundary element method

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Robust Fault Detection for Nonlinear Time-delay Systems Based on Fuzzy Observer 33

Robust Fault Detection for Nonlinear Time-delay Systems Base...

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第三十三届中国控制会议

作者： TAO Hongfeng ZHANG Hua HU Shousong Key Laboratory of Advanced Process Control for Light Industry Ministry of Education Jiangnan University College of Automation Engineering Nanjing University of Aeronautics and Astronautics

ISBN: (纸本)9781479947249

Robust fault detection method based on fuzzy sliding mode observers is developed for a class of uncertain nonlinear systems with time-delay. The uncertain Takagi-Sugeno fuzzy model with time-delay is adopted for fuzzy modeling of nonlinear system to reduce the modeling error, and a synthesis method of the design of sliding mode observers is introduced to generate the estimate state error and residual then to eliminate the effect of the unknown uncertainties of the system for avoiding false alarms, the synthesis method of the observers is presented via solving LMIs. Finally, a simulation example is given to show the design procedure and illustrate the effectiveness of the proposed method.

关键词： nonlinear time-delay systems,sliding mode observer,T-S fuzzy model,fault detection

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Nonlinear asymptotic attitude tracking control for an unmanned helicopter with input constraints

Nonlinear asymptotic attitude tracking control for an unmann...

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2014 American control Conference, ACC 2014

作者： Liu, Xiang Xian, Bin Zhang, Yao Zhang, Xu Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China

ISBN: (纸本)9781479932726

In this paper a nonlinear attitude tracking control scheme is developed for a small-scaled unmanned helicopter under input constraints. Via the analysis of the properties associated with the helicopter's rotor dynamics, the elevator servo input, the aileron servo input, and the rudder servo input are chosen to be the control inputs to be designed. Their constraints in amplitude under hovering flight is taken into account by using the robust bounded terms in the controller design. The asymptotic convergence of the tracking error is guaranteed with the Lyapunov-based stability analysis. © 2014 American Automatic control Council.

关键词： Navigation

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Ultrasound Attenuation Characteristics in Oil-water Two-phase Flow

Ultrasound Attenuation Characteristics in Oil-water Two-phas...

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IEEE International Instrumentation and Measurement Technology Conference

作者： Qian Su 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)9781479961153

Accurate measurement of multiphase flow parameter has significance on the optimization of production process and equipment. Ultrasonic measurement technology has potential applications in two-phase flow measurement. In order to understand the ultrasonic testing mechanism, the ultrasound attenuation characteristics in the oil-water two-phase flow are numerically investigated. Two-dimension models of ultrasonic sensor are set up based on the finite element analysis method. Through calculation of ultrasound pressure distribution in oil-water two-phase flow, the effects of different oil fractions on ultrasound attenuation in oil droplet structure and stratified structure are simulated. Simulation results show that phase distribution and fraction have direct influence on the ultrasound attenuation.

关键词： two-phase flow phase fraction testing mechanism ultrasound attenuation finite element method

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Double-Objective Optimal control for Non-Gaussian Systems: An Example Study on Analytical vs Numerical Solutions

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IFAC-PapersOnLine 2015年第8期48卷 924-929页

作者： Mifeng Ren Jianhua Zhang Hong Wang Min Huang College of Information Engineering Taiyuan University of Technology Taiyuan 030024 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China Control System Centre School of Electrical and Electronics Engineering The University of Manchester M60 1QD UK China State Key Laboratory of Synthetical Automation for Process Industry Northeastern University Shenyang 110819 China

Minimum entropy control has been proven to be an effective method in control of non-Gaussian stochastic systems. In this case, the entropy is proposed as a generalization of the variance measure to characterize the randomness of the process. Minimum entropy corresponds to small uncertainty (or derivation), but it cannot guarantee the tracking error approaching to zero. Therefore, mean square error also should be added in the criterion. In this paper, by using a simple example, the method of generating a representative approximation of the Pareto optimal control set is investigated in both analytical and numerical ways. And simulation results show the feasibility of the proposed double-objective optimal control method.

关键词： Double-objective optimal control non-Gaussian stochastic systems Renyi's entropy e - constrained method estimation of distribution algorithm

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Motion comparison method combining segmented multi-Joint line graphs with the SIFT matching technique

Motion comparison method combining segmented multi-Joint lin...

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4th International Conference on Frontiers of Manufacturing Science and Measuring Technology, ICFMM 2014

作者： Zeng, Ming Ren, Hong Lin Meng, Qing Hao Chen, Chang Wei Ma, Shu Gen Tianjin Key Laboratory of Process Measurement and Control Institute of Robotics and Autonomous Systems School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China

ISBN: (纸本)9783038351924

In this paper, an effective motion comparison method based on segmented multi-joint line graphs combined with the SIFT feature matching method is proposed. Firstly, the multi-joint 3D motion data are captured using the Kinect. Secondly, 3D motion data are normalized and distortion data are removed. Therefore, a 2D line graph can be obtained. Next, SIFT features of the 2D motion line graph are extracted. Finally, the line graphs are divided into several regions and then the comparison results can be calculated based on SIFT matching ratios between the tutor's local line graph and the trainee's local line graph. The experimental results show that the proposed method not only can easily deal with the several challenge problems in motion analysis, e.g., the problem of different rhythm of motions, the problem of a large amount of data, but also can provide detailed error correction cues. © (2014) Trans Tech Publications, Switzerland.

关键词： Motion analysis

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engineering-oriented simulation platform for laminar cooling process of hot rolled strips

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International Journal of Simulation and process Modelling 2015年第4期10卷 327-333页

作者： Pian, Jinxiang Wang, Zhen Zhu, Yunlong Chai, Tianyou Li, Jiejia Faculty of Information and Control Engineering Shenyang Jianzhu University 9 Hunnan East Road Hunnan New District Shenyang Liaoning110168 China Key Laboratory of Networked Control System CAS Chinese Academy of Sciences No. 114 Nanta Street Shenhe District Shenyang Liaoning110016 China State Key Laboratory of Synthetical Automation for Process Industries Northeastern University No. 3-11 Wenhua Road Heping District Shenyang Liaoning110819 China

Because the new approach cannot be applied directly in the hot-rolled strip laminar cooling process, a simulation is necessary to verify the new approach effectively which can improve the strip quality and production yields. In order to make sure simulation platform is similar to the practical industrial process as much as possible, we proposed an engineering-oriented distributed simulation platform for laminar cooling process, integrating part of physical equipment (such as PLC). Additionally, there is physical signals exchange among the controller and virtual sensors in the platform. The simulation platform consists of four parts, including virtual object, virtual instruments and actuators, loop controller and process monitoring computer, and setting controller. The virtual object reflects the actual input and output characteristics of laminar cooling process. Virtual instruments and actuators can simulate the field instruments and actuators. Loop controller and process monitoring show the device operating conditions, the control performance, and give alarm signals in time. Setting controller performs setting control procedures. The experimental results indicate that simulation platform has powerful ability to evaluate the new approach in light of the engineering, which can reduce the live-fire testing cost and meet the requirements of repeated trials. Copyright © 2015 Inderscience Enterprises Ltd.

关键词： controllers

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Recurrence characteristics analysis of near-Surface wind speed signal with different sampling frequencies

Recurrence characteristics analysis of near-Surface wind spe...

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4th International Conference on Frontiers of Manufacturing Science and Measuring Technology, ICFMM 2014

作者： Zeng, Ming Wu, Zhan Xie Meng, Qing Hao Li, Jing Hai Ma, Shu Gen Tianjin Key Laboratory of Process Measurement and Control Institute of Robotics and Autonomous Systems School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China

ISBN: (纸本)9783038351924

The wind is the main factor to influence the propagation of gas in the atmosphere. Therefore, the wind signal obtained by anemometer will provide us valuable clues for searching gas leakage sources. In this paper, the Recurrence Plot (RP) and Recurrence Quantification Analysis (RQA) are applied to analyze the influence of recurrence characteristics of the wind speed time series under the condition of the same place, the same time period and with the sampling frequency of 1hz, 2hz, 4.2hz, 5hz, 8.3hz, 12.5hz and 16.7hz respectively. Research results show that when the sampling frequency is higher than 5hz, the trends of recurrence nature of different groups are basically unchanged. However, when the sampling frequency is set below 5hz, the original trend of recurrence nature is destroyed, because the recurrence characteristic curves obtained using different sampling frequencies appear cross or overlapping phenomena. The above results indicate that the anemometer will not be able to fully capture the detailed information in wind field when its sampling frequency is lower than 5hz. The recurrence characteristics analysis of the wind speed signals provides an important basis for the optimal selection of anemometer. © (2014) Trans Tech Publications, Switzerland.

关键词： Time series

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Biomechanical analysis of typical upper limb movements based on Kinect-LifeMOD

Biomechanical analysis of typical upper limb movements based...

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4th International Conference on Frontiers of Manufacturing Science and Measuring Technology, ICFMM 2014

作者： Zeng, Ming Chen, Chang Wei Meng, Qing Hao Ren, Hong Lin Ma, Shu Gen Tianjin Key Laboratory of Process Measurement and Control Institute of Robotics and Autonomous Systems School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China

ISBN: (纸本)9783038351924

In traditional biomechanical analysis of upper limb, the high-precision motion data and lifelike human models are needed. It is obvious that those processes are costly and time-consuming. In this paper, a novel and simple combination method based on Kinect-LifeMOD is proposed. Firstly, the Microsoft Kinect (a latest depth sensor) is used to build a cheap and precise motion capture platform. Real-time and reliable key-node rotation data of human skeletons can be acquired by this motion capture system. Next, rotation data is converted into position data as the input of the LifeMOD software which can establish mathematical model of upper limb and execute biomechanical analysis automatically. The experimental results show that the proposed method could achieve the satisfactory performance. © (2014) Trans Tech Publications, Switzerland.

关键词： Biomechanics

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Online Identification of Multivariable Nonlinear processes with Iterative Structure Learning and Application to a Diesel Engine

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IFAC Proceedings Volumes 2014年第3期47卷 9216-9222页

作者： Marek Kowalczyk Boliang Yi Rolf Isermann Institute of Automatic Control and Mechatronics Laboratory of Control Engineering and Process Automation Technical University Darmstadt Germany

This contribution presents a new methodology for the online identification, which allows the modeling of the stationary and dynamic behavior of nonlinear combustion engines with many input and output variables in short time with an appropriate model structure. The used models are local polynomial model trees. The necessary enhancements and adaptations of the identification algorithm for local polynomial model trees for the online methodology are presented. To enable an online identification, not only the parameters but also the structure of the models has to be adapted to the ongoing measuring procedure at a test bench. This structure adaptation methods use iteratively recorded measured data for the determination of an optimized model partition and regressor selection regarding the quality and complexity of the model. This maximizes the iterative improvement of the mathematical model, leading to a reduced test bench time. The applicability of the developed methodology is shown for the identification of a model from both, an artificial test function as well as a real diesel engine.

关键词： Engine modeling Mechatronic combustion engine Iterative measurements Identification methods Online identification Model structure adaptation

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