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2016 IEEE International Conference on Advanced Intelligent Mechatronics, AIM 2016

作者： Yi, Yang Jianqing, Zhang Han, Xu Maokuan, Chen Lu, Zhang Zhongjing, Zhu School of Automation Beijing Institute of Technology Beijing China State Key Laboratory of Intelligent Control and Decision of Complex System Beijing Institute of Technology Beijing China Department of Electronic Engineering School of Information Science and Technology Tsinghua University Beijing China

ISBN: (纸本)9781509020652

The main characteristic of FroBot is the dual-swing-legs propulsion mechanism, and it is necessary for us to conduct a series of experiments to study its propulsion model, both on land and underwater. As the propulsion of FroBot comes from the interaction force between caudal fins and water when it locomotes underwater, this paper presents an analysis about the propulsion and control of angle Θ. Then a number of underwater hydrodynamic simulations and analysis are also conducted to get a better control in reality. Finally, on the basis of propulsion model and experiments, we present the latest mechanical structure designs and further improvements to eliminate the limitations exposed in the previous generations of FroBot. © 2016 IEEE.

关键词： Propulsion

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Thoughts and analysis of some problems in the hydraulic control system design with the WBD

Thoughts and analysis of some problems in the hydraulic cont...

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2016 IEEE/CSAA International Conference on Aircraft Utility systems, AUS 2016

作者： Huijun, Jiang Cheng, Qin Yaoxing, Shang Xiaochao, Liu Department of Flight Control and Hydraulic System AVIC the First Aircraft Institute Xi'an710089 China School of Automation Science and Electrical Engineering Beihang University Beijing100191 China

ISBN: (纸本)9781509010875

This paper presents the system works, solution of the limited hydraulic source with the velocity inner loop, and the system optimal design method of reduction ratio. Through modeling and simplifying the system, the static and dynamic characteristics are analyzed, and the selecting requirements of affecting its parameters are proposed. A method is raised to reduce the peak pressure of the hydraulic drive unit (PDU) inlet and outlet pipes and its internal motor. © 2016 IEEE.

关键词： Design

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A hierarchical urban network control with integration of demand balance and traffic signal coordination

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IFAC-PapersOnLine 2016年第3期49卷 31-36页

作者： Zhou, Zhao Lin, Shu Xi, Yugeng Li, Dewei Zhang, Jun Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control Information Processing Ministry of Education of China Shanghai200240 China School of Computer and Control Engineering University of Chinese Academy of Science Beijing100049 China Joint Institute of UM-SJTU Shanghai Jiao Tong University Shanghai200240 China

This paper concerns the integration of demand balance control and traffic flow coordination control in a hierarchical framework for complex urban traffic networks. At the first level, a complex traffic network is first partitioned into several subnetworks. The traffic dynamics in each subnetwork is modeled by utilizing the concept of Macroscopic Fundamental Diagram (MFD), which relates the network-wide space-mean flow and the number of vehicles at the aggregated level. This model aims at designing a demand balance model predictive controller (MPC), which can improve the internal flow inside the subnetwork by regulating the input flows from outside. At the second level, based on a more detailed traffic flow model, the signal timings of all intersections for each subnetwork are determined by a flow coordination MPC controller, which aims at distributing the number of vehicles in each subnetwork as homogeneously as possible. The effectiveness of the proposed approach is investigated via simulation under different scenarios on a hypothetical urban traffic network, and the performance is compared with other control strategies. © 2016

关键词： Street traffic control

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A new algorithm for analyzing method of electrical faults of three-phase induction motors using duty ratios of half-period frequencies according to phase angle changes

Lecture Notes in Mechanical Engineering

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Lecture Notes in Mechanical engineering 2017年 303-317页

作者： Go, Youngjin Song, Myoung-Hyun Kim, Jun-Young Choi, Wangrim Lee, Buhm Kim, Kyoung-Min Department of Electrical Automation Suncheon JEIL College Deogwol-dong Suncheon-cityJeollanam-do Korea Republic of Department of Electric Control Engineering Sunchon National University Maegok-dong Suncheon-cityJeollanam-do Korea Republic of Department of Biomedical and Electronic Engineering Chonnam National University Dundeok-dong Yeosu-cityJeollanam-do Korea Republic of Department of Electrical and Semiconductor Engineering Chonnam National University Dundeok-dong Yeosu-cityJeollanam-do Korea Republic of

A stator fault of induction motor occurs due to the breakdown of insulation, meaning the stator is directly connected with the power supply, and the direct connection is a direct cause of a major accident. For this reason, many studies are being performed to detect the faults. As for the existing studies on stator fault detection, they are being performed considering the possibility of stator fault only, excluding the possibility of rotor fault. It is necessary to identify and detect whether a stator (or rotor) fault is the cause of the electrical fault. This paper suggested a new algorithm that identifies the causes of stator faults with the use of the change in the duty ratio of the half-period frequency of the frequency when a phase angle change occurs at that moment. Also, by applying the algorithm to the fault of the rotor, it was also possible to grasp their fault state and to identify accurately whether a stator (or rotor) fault is the cause of an electrical fault. © Springer International Publishing Switzerland 2017.

关键词： Stators

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Data-driven Unfalsification based Robust Fault Tolerant control 35

Data-driven Unfalsification based Robust Fault Tolerant Cont...

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第35届中国控制会议

作者： Ma Weize Li Xiaocheng Wang Jingcheng Wang Bohui Lin Hai National Engineering and Research Center for Commercial Aircraft Manufacturing Commercial Aircraft Corporation of China Ltd Department of Automation Shanghai Jiao Tong Universityand Key Laboratory of System Control and Information ProcessingMinistry of Education of China

ISBN: (纸本)9781509009107

The paper combined the unfalsified control(UC) which is a data-driven method and Youla parameterization for fault-tolerant control(FTC).The controller reconstruction of the FTC method uses the Youla parameterization for handling with faulty *** is a passive and model-free FTC method without know about plant models or faults *** candidate controller structure is pre-designed by the prior information,and then the FTC is done through tuning Youla parameter without changing the controller *** UC-FTC is done by the following three steps:design of candidate controllers,performance monitor,switching and *** method also provides an finite controller set to seek for the best performance by unfalsified ***,the UC-FTC method is applied to a MIMO system.

关键词： unfalsified control Youla parameterization fault-tolerant control

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Observer-based fault detection for affine nonlinear systems with disturbances and uncertainties 35

Observer-based fault detection for affine nonlinear systems ...

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第35届中国控制会议

作者： HAN Huayun YANG Ying LI Linlin Chen Yu State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering ScienceCollege of Engineering Peking University School of Automation and Electrical Engineering University of Science and Technology Beijing the Institute for Automatic Control and Complex Systems (AKS) University of Duisburg-Essen Beijing Institute of Astronautics System Engineering

ISBN: (纸本)9781509009107

This paper is concerned with the integrated design schemes of L observer-based fault detection（FD） systems for affine nonlinear processes with disturbances and uncertainties,*** this end,a so called L observer-based FD scheme is studied ***,the integrated design approaches for nonlinear systems with disturbances and uncertainties are addressed,*** the end,examples are given to illustrate the effectiveness of the proposed approaches.

关键词： Robust Fault Detection Observer Design Affine Nonlinear systems

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Inverse-square law between time and amplitude for crossing tipping thresholds

arXiv

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arXiv 2017年

作者： Ritchie, Paul Karabacak, Özkan Sieber, Jan Earth System Science College of Life and Environmental Sciences University of Exeter Harrison Building ExeterEX4 4QF United Kingdom Department of Electronic Systems Automation and Control Aalborg University Fredrik Bajers Vej 7 C Aalborg East9220 Denmark Centre for Systems Dynamics and Control College of Engineering Mathematics and Physical Sciences University of Exeter Harrison Building ExeterEX4 4QF United Kingdom

A classical scenario for tipping is that a dynamical system experiences a slow parameter drift across a fold tipping point, caused by a run-away positive feedback loop. We study what happens if one turns around after one has crossed the threshold. We derive a simple criterion that relates how far the parameter exceeds the tipping threshold maximally and how long the parameter stays above the threshold to avoid tipping in an inverse-square law to observable properties of the dynamical system near the fold. For the case when the dynamical system is subject to stochastic forcing we give an approximation to the probability of tipping if a parameter changing in time reverses near the tipping point. The derived approximations are valid if the parameter change in time is sufficiently slow. We demonstrate for a higher dimensional system, a model for the Indian summer monsoon, how numerically observed escape from the equilibrium converge to our asymptotic expressions. The inverse-square law between peak of the parameter forcing and the time the parameter spends above a given threshold is also visible in the level curves of equal probability when the system is subject to random disturbances. Copyright © 2017, The Authors. All rights reserved.

关键词： Dynamical systems

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Repeated Strike Process During Disconnector Operation in Ultra-High Voltage Gas-Insulated Switchgear

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Plasma Science and Technology 2016年第3期18卷 247-253页

作者：关永刚蔡元纪陈维江刘卫东李志兵岳功昌张俊民 State Key Lab of Control and Simulation of Power System and Generation Equipments Department of Electrical EngineeringTsinghua UniversityBeijing 100084China State Grid Corporation of China Beijing 100031China China Electric Power Research Institute Beijing 100192China School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China

Very fast transient over-voltage （VFTO）, induced by disconnector operations in gas- insulated switchgears, has become the limiting dielectric stress at ultra-high voltage levels. Much work has been done to investigate single-strike waveforms of VFTO. However, little study has been carried out investigating the repeated strike process, which would influence VFTO significantly. In this paper, we carried out 450 effective experiments in an ultra-high voltage test circuit, and conducted calculations through the Monte Carlo simulation method, to investigate the repeated strike process. Firstly, the mechanism of the repeated strike process is proposed, based on the ex- perimentai results. Afterwards, statistical breakdown characteristics of disconnectors are obtained and analyzed. Finally, simulations of the repeated strike process are conducted, which indicate that the dielectric strength recovery speed and polarity effect factor have a joint effect on VFTO. This study enhances the understanding of the nature of VFTO, and may help to optimize the disconnector designed to minimize VFTO.

关键词： disconnector （DS） repeated strike process discharge statistical breakdowncharacteristics ultra-high voltage （UHV） very fast transient over-voltage （VFTO）

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On Robust Stability of Switched systems in the Context of Filippov Solutions

arXiv

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arXiv 2017年

作者： Ahmadi, Mohamadreza Mojallali, Hamed Wisniewski, Rafael University of Texas at Austin Peter O’Donnell Jr. Building 201 E 24th St AustinTX78712 United States Department of Electrical Engineering Faculty of Engineering University of Guilan Rasht41996-13769 Iran Department of Electronic Systems Automation and Control Aalborg University Fredrik Bajers Vej 7 C Aalborg East9220 Denmark

The stability problem of a class of nonlinear switched systems defined on compact sets with state-dependent switching is considered. Instead of the Carathéodory solutions, the general Filippov solutions are studied. This encapsulates solutions with infinite switching in finite time and sliding modes in the neighborhood of the switching surfaces. In this regard, a Lyapunov-like stability theorem, based on the theory of differential inclusions, is formulated. Additionally, the results are extended to switched systems with simplical uncertainty. It is also demonstrated that, for the special case of polynomial switched systems defined on semi-algebraic sets, stability analysis can be checked based on sum of squares programming techniques. Copyright © 2017, The Authors. All rights reserved.

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Optimal power management for failure mode of MVDC microgrids in all-electric ships

arXiv

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arXiv 2017年

作者： Xu, Qimin Yang, Bo Han, Qiaoni Yuan, Yazhou Chen, Cailian Guan, Xinping Department of Automation Shanghai Jiao Tong University Shanghai200240 China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai200240 China Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai200240 China Institute of Electrical Engineering Yanshan University Qinhuangdao066004 China

Optimal power management of shipboard power system for failure mode (OPMSF) is a significant and challenging problem considering the safety of system and person. Many existing works focused on the transient-time recovery without consideration of the operating cost and the voyage plan. In this paper, the OPMSF problem is formulated considering the mid-time scheduling and the faults at bus and generator. Two-side adjustment methods including the load shedding and the reconfiguration are coordinated for reducing the fault effects. To address the formulated non-convex problem, the travel equality constraint and fractional energy efficiency operation indicator (EEOI) limitation are transformed into the convex forms. Then, considering the infeasibility scenario affected by faults, a further relaxation is adopted to formulate a new problem with feasibility guaranteed. Furthermore, a sufficient condition is derived to ensure that the new problem has the same optimal solution as the original one. Because of the mixed-integer nonlinear feature, an optimal management algorithm based on Benders decomposition (BD) is developed to solve the new one. Due to the slow convergence caused by the time-coupled constraints, a low-complexity near-optimal algorithm based on BD (LNBD) is proposed. The results verify the effectivity of the proposed methods and algorithms. Copyright © 2017, The Authors. All rights reserved.

关键词： Relaxation processes

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