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International Conference on Mechatronics and control (ICMC)

作者： Cong Xu Chao Tan Feng Dong Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin Tianjin CN Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin P.R. China

ISBN: (纸本)9781479925391

Non-invasive ultrasonic tomography is a practical solution of extracting cross-section information regarding the process of two-phase flow. For gas/water two-phase flow, the ultrasonic energy would be reflected about 99.94% at the gas/water interface due to the great differences between the acoustic impedance of water and gas. In this paper, the relations between pressure or voltage loss and bubble diameter has been studied by simulation results and experimental results, respectively by the ultrasonic transmission method. Both results showed that the transmission-mode measurement method has good resolution on the bubble diameter.

关键词： Acoustics Ultrasonic variables measurement Tomography Attenuation Impedance Real-time systems Acoustic measurements

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A new pricing scheme for controlling energy storage devices in smart grid

A new pricing scheme for controlling energy storage devices ...

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2014 American control Conference, ACC 2014

作者： Zhu, Jingwei Chen, Michael Z. Q. Zuo, Zhiqiang Du, Baozhu Department of Mechanical Science and Engineering University of Illinois at Urbana-Champaign Champaign IL 61820 United States Department of Mechanical Engineering University of Hong Kong Hong Kong Hong Kong Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China School of Automation Nanjing University of Science and Technology Nanjing China HKU Shenzhen Institute of Research and Innovation China

ISBN: (纸本)9781479932726

Improvement of the overall efficiency of energy infrastructure is one of the main anticipated benefits of the deployment of smart grid technology. Advancement in energy storage technology and two-way communication in the electric network are indispensable components to achieve such a vision, while efficient pricing schemes and appropriate storage management are also essential. In this paper, we propose a novel pricing scheme which permits one to indirectly control the energy storage devices in the grid to achieve a more desirable aggregate demand profile that meets a particular target of the grid operator such as energy generation cost minimization and carbon emission reduction. Such a pricing scheme can potentially be applied to control the behavior of energy storage devices installed for integration of intermittent renewable energy sources that have permission to grid connection and will have broader applications as an increasing number of novel and low-cost energy storage technologies emerge. © 2014 American Automatic control Council.

关键词： Smart power grids

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Immersion and Invariance based Adaptive Attitude Tracking control of a Quadrotor UAV in the Presence of Parametric Uncertainty

Immersion and Invariance based Adaptive Attitude Tracking Co...

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第三十三届中国控制会议

作者： Bo Zhao Bin Xian Yao Zhang Xu Zhang The Institute of Robotics and Autonomous System the Tianjin Key Laboratory of Process Measurement and ControlSchool of Electrical Engineering and Automation Tianjin University

ISBN: (纸本)9781479947249

In this paper, a new adaptive controller for a quadrotor unmanned aerial vehicle(UAV) is presented via Immersion and Invariance(I&I) approach. The quadrotor's dynamic model is subjected to some uncertain parameters such as the inertial moments, aerodynamic damping coefficients and so on. In particular, the mass-eccentric effects by the payloads are also *** all these uncertainties above, the proposed adaptive controller is still capable of driving the quadrotor UAV's attitude asymptotically to a desired trajectory. The stability analysis is performed by Lyapunov techniques and LaSalle's invariance theorem. Numerical simulation results illustrate the good tracking performance of the proposed scheme.

关键词： quadrotor,UAV,adaptive control,immersion and invariance,I&I

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Corrigendum to “Limit load solutions of thick-walled cylinders with fully circumferential cracks under combined internal pressure and axial tension” [Nucl. Eng. Des. 238 (2008) 2155–2164]

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Nuclear engineering and Design 2015年 284卷 309-309页

作者： Zengliang Gao Gangsi Cai Lihua Liang Yuebao Lei Institute of Process Equipment and Control Engineering Zhejiang University of Technology The MOE Key Laboratory of Mechanical Manufacture and Automation Hangzhou 310032 China Wenzhou Industry Design Institute Wenzhou 325000 China

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A synthesis approach to predictive control for networked control systems 33

A synthesis approach to predictive control for networked con...

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Proceedings of the 33rd Chinese control Conference, CCC 2014

作者： Zou, Yuanyuan James, Lam Niu, Yugang Li, Dewei Key Laboratory of Advanced Control and Optimization for Chemical Process Ministry of Education East China University of Science and Technology Shanghai200237 China Department of Mechanical Engineering University of Hong Kong Hong Kong Department of Automation Shanghai Jiao Tong University Shanghai200240 China

ISBN: (纸本)9789881563842

This paper studies a synthesis approach to predictive control for networked control systems with data loss and quantization. An augmented Markov jump linear model with polytopic uncertainties is modeled to describe the quantization errors and possible data loss. Based on this model, a predictive control synthesis approach is developed, which involves online optimization of a infinite horizon objective and conditions to deal with system constraints. The proposed MPC algorithm guarantees closed-loop mean-square stability and constraints satisfaction. © 2014 TCCT, CAA.

关键词： Networked control systems

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Time Delay Prediction Method Based on EMD and Elman Neural Network

Time Delay Prediction Method Based on EMD and Elman Neural N...

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International Conference on Intelligent Human-Machine Systems and Cybernetics, IHMSC

作者： Fan Yu Dan Chen Xusheng Tang Research Center for Advanced Process Control Fuzhou University Fuzhou China College of Mechanical Engineering and Automation Fuzhou University Fuzhou China

ISBN: (纸本)9781479949540

The time-delay in the teleoperation system is an important parameter affecting the stability and performance. A time delay prediction method based on EMD(Empirical Mode Decomposition) and Elman neural network is proposed in this paper. Firstly, time delay sequence is separated into IMFs by EMD, then the first several IMFs are subtracted from time delay signals as noise. The sum of rest IMFs are taken as the input of Elman neural network to predict. Finally, computer simulation of teleoperation is built. The results of experiments indicate that the proposed method based on EMD and Elman neural network is more accurate and has better prediction ability than which is predicted by Elman neural network directly.

关键词： Delay effects Neural networks Noise Educational institutions Internet Prediction algorithms Hidden Markov models

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Temperature Modeling of PEM Fuel Cell Based on Fuzzy Strategy

Temperature Modeling of PEM Fuel Cell Based on Fuzzy Strateg...

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第26届中国控制与决策会议

作者： Yan Qun Li Qing Zhang Peichang Yu Datai School of Automation & Electrical Engineering University of Science and Technology Beijing Key Laboratory of Advanced Control of Iron and Steel Process (Ministry of Education)

Proton Exchange Membrane Fuel cell has many perfect characters and becomes one of the most important research subjects among domestic and international fuel cell fields. Heat transfer management is one of the key technologies for PEM fuel cell. This paper built a temperature model of PEM fuel cell based on fuzzy technology, which divided the fuzzy space evenly by established rules, got the number of fuzzy rules and rules application degree, identified the consequent parameters by least square method. This model is fit for multi-variables and has simple construction and high accuracy. Finally, simulation examples show the effectiveness of the modeling.

关键词： fuzzy identification,PEM fuel cell,temperature system,T-S model

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Sensor system for unsteady flow characteristics in a sonic nozzle with vapor condensation

Sensor system for unsteady flow characteristics in a sonic n...

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International Instrumentation and Measurement Technology Conference

作者： Chao Wang Hongbing Ding Yakun Zhao Yong Yan Yonghui hu Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Instrumentation Control and Embedded Systems Group School of Engineering and Digital Arts University of Kent School of Control and Computer Engineering North China Electric Power University

ISBN: (纸本)9781467363846

Experiments on periodic, unsteady compressible flow in a sonic nozzle with heat addition were reported. This unsteady flow is caused by the condensation of water vapor in the sonic nozzle which will affect the flow rate of the sonic nozzle. A dimensional analysis for the essential effect factors of unsteady flow frequency was carried out. An experimental system including a sensor for pressure oscillation monitoring was built. The experimental results agree well with the simulation and semi-empirical formula. Both the sensor and experimental results can be used to further study the effect of unsteady flow due to the condensation of water vapor on the flow rate of the sonic nozzle.

关键词： fast pressure sensor frequency characteristics unsteady flow rate vapor condensation sonic nozzle

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Hovering control of a nano quadrotor unmanned aerial vehicle using optical flow

Hovering control of a nano quadrotor unmanned aerial vehicle...

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Chinese control Conference (CCC)

作者： Bin Xian Yang Liu Xu Zhang Meihui Cao Fu Wang The Institute of Robotics and Autonomous System The Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin Tianjin CN

In this paper, a PD controller which uses optical flow to obtain position and velocity feedback is proposed for the autonomous hovering flight control of a nano quadrotor unmanned aerial vehicle (UAV). The nano quadrotor UAV has a mass less than 100 g and is comparatively much smaller than the micro vehicles utilized in previous research. Due to the limited size and payload ability, a wireless camera is employed as the onboard visual device to obtain the position and translational velocity of the UAV. Experiment results are included to demonstrate the good control performance of the proposed design.

关键词： Image motion analysis Computer vision Optical imaging Optical sensors Adaptive optics Optical filters Optical feedback

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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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American control Conference

作者： Xiang Liu Bin Xian Yao Zhang Xu Zhang Institute of Robotics and Autonomous System the Tianjin Key Laboratory of Process Measurement and Control Schoool of Electrical Engineering and Automation Tianjin University Tianjin 300072 China

ISBN: (纸本)9781479932757

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.

关键词： Helicopters Rotors Attitude control Vectors Servomotors Stability analysis Equations

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