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Strategic Robust Mixed Model Assembly Line Balancing Based on Scenario Planning

Tsinghua science and Technology 2011年第3期16卷 308-314页

作者：徐炜达肖田元 National Laboratory for Information Science and Technology National Computer Integrated Manufacturing Systems Engineering Research CenterDepartment of AutomationTsinghua University

Assembly line balancing involves assigning a series of task elements to uniform sequential stations with certain restrictions. Decision makers often discover that a task assignment which is optimal with respect to a deterministic or stochastic/fuzzy model yields quite poor performance in reality. In real environments, assembly line balancing robustness is a more appropriate decision selection guide. A robust model based on the α worst case scenario is developed to compensate for the drawbacks of traditional robust criteria. A robust genetic algorithm is used to solve the problem. Comprehensive computational experiments to study the effect of the solution procedure show that the model generates more flexible robust solutions. Careful tuning the value of α allows the decision maker to balance robustness and conservativeness of as- sembly line task element assignments.

关键词： mixed model assembly line balancing robust scenario planning genetic algorithm

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Integrated Approach to Hypersonic Vehicle Modeling

Integrated Approach to Hypersonic Vehicle Modeling

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Chinese Control Conference

作者： Xiaofeng Su Yingmin Jia Junping Du Fashan Yu The Seventh Research Division and the Department of Systems and Control Beihang University (BUAA) Key Laboratory of Mathematics Informatics and Behavioral Semantics (LMIB) Ministry of Education SMSS Beihang University (BUAA) Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunications School of Electrical Engineering and Automation Henan Polytechnic University

ISBN: (纸本)9781467325813

This paper is devoted to the modeling problem of hypersonic vehicle with significant couplings. An integrated approach is developed to analytically model the dynamics of hypersonic vehicle, in which the effects of variable mass, spherical rotating earth, and couplings among the sub-models are considered. Furthermore, a preliminary analysis is conducted using the general data of a hypersonic vehicle. The simulation results show that the maximum of the Coriolis force can reach values up to 7.02% of the vehicle weight, and that the thermal load determined by the nonuniform aerodynamic heating and the properties of the structure has a significant influence on the elastic deformation.

关键词： Hypersonic vehicle modeling Inertial dynamics Aerodynamics Elasticity Heating hypersonic vehicles Aerodynamics elasticity Coriolis force Vehicle weight Heating Couplings Thermal loading elastic deformation

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Towards an ontology for autonomous robots

Towards an ontology for autonomous robots

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25th IEEE/RSJ International Conference on Robotics and Intelligent Systems, IROS 2012

作者： Paull, Liam Severac, Gaetan Raffo, Guilherme V. Angel, Julian Mauricio Boley, Harold Durst, Phillip J. Gray, Wendell Habib, Maki Nguyen, Bao Ragavan, S. Veera Saeedi G., Sajad Sanz, Ricardo Seto, Mae Stefanovski, Aleksandar Trentini, Michael Li, Howard COBRA Department of Electrical and Computer Engineering University of New Brunswick Fredericton NB E3B 5A3 Canada ONERA-University of Toulouse France Department of Automation and Systems Federal University of Santa Catarina Brazil Department of Computer Engineering Pontificia Universidad Javeriana Bogot Colombia National Research Council Canada US Army ERDC 3909 Halls Ferry Road Vicksburg MS 39180 United States Mechanical Engineering Department School of Sciences and Engineering American University in Cairo New Cairo Egypt Defence Research and Development Canada-CORA Ottawa ON Canada Monash University Sunway Campus Australia Systems Engineering and Automatic Control Autonomous Systems Laboratory Research Group Universidad Politcnica de Madrid Madrid Spain Defence Research and Development Canada-Atlantic Dartmouth NS Canada Department of Computer Science George Washington University United States Defence R and D Canada-Suffield PO Box 4000 Station Main Medicine Hat AB T1A 8K6 Canada

ISBN: (纸本)9781467317375

The IEEE RAS Ontologies for Robotics and automation Working Group is dedicated to developing a methodology for knowledge representation and reasoning in robotics and automation. As part of this working group, the Autonomous Robots sub-group is tasked with developing ontology modules for autonomous robots. This paper describes the work in progress on the development of ontologies for autonomous systems. For autonomous systems, the focus is on the cooperation, coordination, and communication of multiple unmanned aerial vehicles (UAVs), unmanned ground vehicles (UGVs), and autonomous underwater vehicles (AUVs). The ontologies serve as a framework for working out concepts of employment with multiple vehicles for a variety of operational scenarios with emphasis on collaborative and cooperative missions. © 2012 IEEE.

关键词： Ontology

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Detection of Direct Causality Based on Process Data

Detection of Direct Causality Based on Process Data

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American Control Conference

作者： Ping Duan Fan Yang Tongwen Chen Sirish L. Shah Department of Electrical and Computer Engineering University of Alberta Edmonton AB T6G 2V4 Canada Tsinghua National Laboratory for Information Science and Technology Department of Automation Tsinghua University Beijing 100084 China Department of Chemical and Materials Engineering University of Alberta Edmonton AB T6G 2G6 Canada

ISBN: (纸本)9781457710957

Direct causality detection is an important and challenging problem in root cause and hazard propagation analysis. Several methods provide effective solutions to this problem for linear relationships. For nonlinear situations, currently only causality analysis can be conducted, but the direct causality cannot be identified based on process data. In this paper, we describe a direct causality detection approach suitable for both linear and nonlinear connections. Based on an extension of the transfer entropy approach, a direct transfer entropy (DTE) concept is proposed to detect whether there is a direct information and/or material flow pathway from one variable to another. A discrete DTE and a differential DTE are defined for discrete and continuous random variables, respectively;and the relationship between them is discussed. The effectiveness of the proposed method is illustrated by two examples and an experimental case study.

关键词： Entropy Vectors Materials Random variables Joints Kernel Estimation

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Stochastic H_2 Optimal Control of Discrete-Time Markov Jump Systems with Periodic Coefficients

Stochastic H_2 Optimal Control of Discrete-Time Markov Jump ...

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American Control Conference

作者： Hongji Ma Yingmin Jia Junping Du Fashan Yu Seventh Research Division and the Department of Systems and Control Beihang University (BUAA) Beijing 100191 China Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing 100876 China School of Electrical Engineering and Automation Henan Polytechnic University Jiaozuo 454000 Henan China

ISBN: (纸本)9781457710957

In this paper, the H_2 optimal state-feedback control problem is investigated for discrete-time Markov jump systems subject to periodic coefficients and multiplicative noise. First of all, an exhaustive analysis is pursued to set up an H_2 performance criterion (H_2 norm), which can be characterized by the periodic solutions of two generalized Lyapunov equations. Based on the obtained H_2 norm, the H_2 optimal state-feedback controller is designed in terms of the stabilizing solution of a discrete-time generalized Riccati equation with periodic coefficients. Moreover, this stabilizing solution can be computed efficiently by the available iterative algorithm.

关键词： Markov processes Noise Educational institutions Riccati equations Optimal control

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Lane Keeping Control for Autonomous 4WS4WD Vehicles Subject to Wheel Slip Constraint

Lane Keeping Control for Autonomous 4WS4WD Vehicles Subject ...

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American Control Conference

作者： Changfang Chen Yingmin Jia Junping Du Fashan Yu Seventh Research Division and the Department of Systems and Control Beihang University (BUAA) Beijing 100191 China Beijing Key Laboratory of Intelligent Telecom-munications Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing 100876 China School of Electrical Engineering and Automation Henan Polytechnic University Jiaozuo 454000 Henan China

ISBN: (纸本)9781457710957

This paper proposes a robust control scheme that prevents an autonomous 4WS4WD vehicle from lane departure and wheel skidding in presence of road curvature and aerodynamic drag. The control objectives can be specified as various closed-loop specifications, such as lane keeping, wheel slip constraint and disturbance attenuation. An LMI approach is used to deal with these objectives simultaneously, which combines the quadratic stabilization technique with constraints on inputs. Simulation results show that the proposed controller effectively limits the combined wheel slip and improves the lane keeping performance.

关键词： Wheels Vehicles Roads Tires Friction Aerodynamics Vehicle dynamics

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Cage-based tree deformation

引用

Lecture Notes in computer science

作者： Zhu, Chao Meng, Weiliang Wang, Yinghui Zhang, Xiaopeng Sino-French Laboratory LIAMA CAS Institute of Automation Beijing China National Laboratory of Pattern Recognition CAS Institute of Automation Beijing China Department of Computer Science and Engineering Xi'an University of Technology Xi'an China

ISBN: (纸本)9783642234552

Tree models are broadly used in multimedia applications, but it is a challenge task to deform trees with plenty of branches. We propose a novel method to deform the tree model interactively using cages based on trees' property, and we design a framework to control the hierarchy deformation of trees. The bounding box of the trunk is used as the global control cage, while the bounding boxes of branches are set as local cages. The linear combination of mean value coordinates computed from local cages and the global cage decides the vertices deformed positions of the deformed tree. This framework is straightforward and effective, which could also preserve local details of the tree. Experimental results show that our technique is suitable for deforming trees with many branches. © 2011 Springer-Verlag.

关键词： Deformation

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Time Delay Characteristic of Industrial Wireless Networks Based on IEEE 802.15.4a

引用

International Journal of automation and computing 2011年第2期8卷 170-176页

作者： Tong-Tao Li Ting-Gang Jia Min-Rui Fei Huo-Sheng Hu Shanghai Key Laboratory of Power Station Automation Technology School of Mechatronics Engineering and Automation Shanghai University Shanghai 200072 PRC Central Academy Shanghai Electric Group Co. Ltd. Shanghai 200336 PRC School of Information Science and Engineering East China University of Science and Technology Shanghai 200237 PRC School of Computer Science and Electronic Engineering University of Essex Colchester CO4 3SQ UK

The IEEE 802.15.4a standard provides a framework for low-data-rate communication systems,typically sensor *** this paper,we established a realistic environment for the time delay characteristic of industrial network based on IEEE *** sets of practical experiments are conducted to study its various features,including the effects of 1） numeral wireless nodes,2） numeral data packets,3） data transmissions with different upper-layer protocols,4） physical distance between nodes,and 5） adding and reducing the number of the wireless *** results show that IEEE 802.15.4a is suitable for some industrial applications that have more relaxed throughput requirements and *** issues that could degrade the network performance are also discussed.

关键词： Time delay characteristic IEEE 802.15.4a industrial wireless network performance test sensor networks.

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Towards an Ontology for Autonomous Robots

Towards an Ontology for Autonomous Robots

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2012 IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Liam Paull Gaetan Severac Guilherme V. Raffo Julian Mauricio Angel Harold Boley Phillip J Durst Wendell Gray Maki Habib Bao Nguyen S. Veera Ragavan Sajad Saeedi G. Ricardo Sanz Mae Seto Aleksandar Stefanovski Michael Trentini Howard Li COBRA Department of Electrical and Computer Engineering University of New Brunswick Fredericton Canada ONERA - University of Toulouse France Department of Automation and Systems Federal University of Santa Catarina Brazil Department of Computer Engineering Pontificia Universidad Javeriana Bogot Colombia National Research Council Canada US Army ERDC Vicksburg Ms Mechanical Engineering Department School of Sciences and Engineering The American University in Cairo New Cairo Egypt Defence Research and Development Canada - CORA Ottawa ON Canada Monash University Sunway Campus Systems Engineering and Automatic Control Autonomous Systems Laboratory research group Universidad Politcnica de Madrid Madrid Spain Defence Research and Development Canada - Atlantic NS Canada Department of Computer Science The George Washington University Defence R&D Canada - Suffield Medicine Hat AB Canada

ISBN: (纸本)9781467317375

关键词： Ontologies Robot kinematics Sensors Planning Mobile robots Navigation

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Locating faults using multiple spectra-specific models 11

Locating faults using multiple spectra-specific models

引用

Proceedings of the 2011 ACM Symposium on Applied Computing

作者： Yu, Kai Lin, Mengxiang Gao, Qing Zhang, Hui Zhang, Xiangyu State Key Laboratory of Software Development Environment Beihang University China School of Computer Science and Engineering Beihang University China School of Mechanical Engineering and Automation Beihang University China

ISBN: (纸本)9781450301138

Spectra-based fault localization (SFL) techniques have brought encouraging results and a variety of program spectra have been proposed to locate faults. Different types of abnormal behaviors may be revealed by different kinds of spectra. Compared to techniques using single spectra type, techniques combining multiple types of spectra try to leverage the strengths of the constituent types. However, in the presence of multiple kinds of spectra, how to select adequate spectra type and build appropriate models need further investigation. In this paper, we propose an SFL technique LOUPE, which uses multiple spectra-specific models. Both control and data dependences are introduced to capture unusual behaviors of faults. In the stage of suspiciousness modeling, in contrast with previous studies, we build different models to evaluate the suspiciousness of statements for each spectra type respectively. Finally, since the fault type is unknown in advance, suspiciousness scores are calculated based on the two models. We evaluate LOUPE on the Siemens benchmark and experimental results show that our technique is promising. © 2011 ACM.

关键词： multiple spectra types spectra-specific model fault localization spectra selection multiple models

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