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IEEE International Conference on Automation science and Engineering (CASE)

作者： Haw-Ching Yang Ying-Liang Chen Min-Hsiung Hung Fan-Tien Cheng Institute of System Information and Control National Kaohsiung First University of Science and Technology Kaohsiung Taiwan Institute of Manufacturing Engineering National Cheng Kung University Tainan Taiwan Department of Computer Science Chinese Cultural University Taipei Taiwan

ISBN: (纸本)9781424454471

This work develops a novel virtual production control system (VPCS), which is allocated on a manufacturer side to adjust production pace of a supplier using a short-term demand plan for reducing inventory level. In addition to remotely monitoring production progress of a supplier, the proposed VPCS allows manufacturers to pre-schedule the latest outputs using an integer programming model, to simulate the short-term plan by a stochastic colored timed Petri Nets, and to adjust the production pace of the supplier via the plan. An industrial case study shows that the supplier inventory was reduced by 13.8% over that of the real inventory level with an order-fill rate exceeding 99.6% using the proposed VPCS.

关键词： Materials Programming Predictive models Data preprocessing Capacity planning

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Modelling of FAST equilibrium configurations by a Toroidal Multipolar Expansion code using Kepler workflows

Modelling of FAST equilibrium configurations by a Toroidal M...

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37th EPS Conference on Plasma Physics 2010, EPS 2010

作者： Calabrò, G. Giovannozzi, E. Ramogida, G. Crisanti, F. Labate, C. Mattei, M. Micozzi, P. Pizzuto, A. Sadeghi, Y. Vlad, G. Associazione Euratom-ENEA Via Enrico Fermi 46 0044 Frascati Italy Associazione Euratom-ENEA-CREATE Univ. Napoli Federico- II Via Claudio 21 I-80125 Napoli Italy Università di Roma Tor Vergata Control System and Robotics Group Department of Computer Science Systems and Production Via del Politecnico 1 I-00133 Roma Italy

ISBN: (纸本)9781622763313

In this paper we present the fusion advanced studies torus (FAST) equilibrium configurations, designed by means of the ITM FIXFREE code version for reproducing those of ITER (with scaled plasma current) and suitable to fulfil plasma conditions for integrated studies of plasma-wall interaction, burning plasma physics, ITER relevant operation problems and steady state scenarios. FIXFREE is a toroidal multipolar expansions equilibrium code, recently ported to the Integrated Tokamak Modelling (ITM) Gateway platform. The European ITM Task Force opted for the open source workflow system Kepler to link various codes and coordinate the data flow among them. A description of the development of the FIXFREE code under the Kepler environment will be given in this paper.

关键词： Codes (symbols)

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Development of an automatic virtual metrology framework for TFT-LCD industry

Development of an automatic virtual metrology framework for ...

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IEEE International Conference on Automation science and Engineering (CASE)

作者： Min-Hsiung Hung Hsien-Cheng Huang Haw-Ching Yang Fan-Tien Cheng Department of Computer Science Chinese Cultural University Taipei Taiwan Institute of Manufacturing Information and Systems National Cheng Kung University Tainan Taiwan Institute of System Information and Control National Kaohsiung First University of Science and Technology Kaohsiung Taiwan

ISBN: (纸本)9781424454471

An automatic virtual metrology framework (AVMF) for the TFT-LCD industry is designed and implemented in this paper. The AVMF has capabilities of creating VM models, deploying and refreshing VM models, monitoring and managing VM systems remotely, storing model data and conjectured results centrally, and providing various friendly graphical user interfaces. Pluggable interfaces and functional modules are developed in the AVMF. Thus, by plugging the associated functional module according to desired requirements, the AVMF can be applied to different types of equipment. In turn, applying the AVMF to all pieces of equipment in the factory can be easily achieved. A paradigm AVM system for our cooperative TFT-LCD company is constructed. Integrated testing results show that the paradigm AVMS works smoothly, meets the desired functional requirements, and demonstrates a good performance. It is believed that the developed AVMF can be practically applied in the TFT-LCD industries.

关键词： Servers Data models Metrology Kernel Databases Computational modeling Monitoring

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Dynamic modeling and tracking control of fuel filled space robotic system with flexible manipulators

Dynamic modeling and tracking control of fuel filled space r...

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International Symposium on systems and control in Aerospace and Astronautics (ISSCAA)

作者： Xinxin Yang Xiong Luo Fuchun Sun Fengge Wu Huaping Liu School of Information Engineering Key Laboratory of Advanced Control of Iron and Steel Process (Ministry of Education) University of Science and Technology Beijing Beijing China State Key Laboratory of Intelligent Technology and System Department of Computer Science and TechnologyTsinghua National Laboratory for Information Science and Technology Tsinghua University Beijing China

In recent years, dynamics model and control of space robot system are the hot topics in the research field. In this paper, a new dynamics model and control strategy of space robotic system with a flexible manipulator and a liquid fuel tank are investigated. Based on Lagrange equation method, the dynamics model of the space robotic system coupling with liquid sloshing, flexibility vibration and base movement is derived. The elastic deflection of the flexible manipulator is described by the assumed mode method and equivalent mechanical model is adopted instead of liquid sloshing under the environment of low-gravity. The inverse dynamics control algorithm combined with PD control method is performed to solve the trajectory tracking problem. Some simulation results are given to verify the effectiveness of the proposed method.

关键词： Mathematical model Aerospace electronics Manipulator dynamics Equations Space vehicles

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Fuzzy dynamic characteristic modeling and intelligent adaptive control for complex spacecraft

Fuzzy dynamic characteristic modeling and intelligent adapti...

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World Congress on Intelligent control and Automation (WCICA)

作者： Xiong Luo Song Hu Zengqi Sun Xintao Qiu School of Information Engineering Key Laboratory of Advanced Control of Iron and Steel Process (Ministry of Education) University of Science and Technology Beijing Beijing China State Key Laboratory of Intelligent Technology and System Department of Computer Science and Technology Tsinghua National Laboratory for Information Science and Technology Tsinghua University Beijing China

Because of strong coupling, nonlinear, and time-varying characteristics, it is difficult to control complex spacecraft. By means of combining with controlled object dynamics and performance requirements, characteristic modeling and control approach is an effective way to solve this problem. Aimed at the flexible satellites described by using characteristic modeling approach, with the help of fuzzy rules, fuzzy dynamic characteristic modeling method and intelligent adaptive controller are designed to control this complex spacecraft. Meanwhile, based on the satellite system simulation platform, we validate the correctness and efficiency of the proposed modeling and control method by comparing with the simulation results of the other similar methods.

关键词： Adaptation model Laboratories Satellites Space vehicles Intelligent control Artificial intelligence Information science

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New features of Easy Java Simulations for 3D Modeling

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IFAC Proceedings Volumes 2010年第24期42卷 250-255页

作者： Carlos A. Jara Francisco Esquembre Francisco A. Candelas Fernando Torres Sebastián Dormido Department of Physics System Engineering and Signal Theory University of Alicante Alicante Spain (e-mail:{carlos.jara francisco.candelas fernando.torres}@ua.es) Department of Mathematics University of Murcia Murcia Spain (e-mail: fem@um.es) Department of Computer Science and Automatic Control UNED University Madrid Spain (e-mail: sdormido@dia.uned.es)

This paper presents a new interface framework which has been added to Easy Java Simualtions' environment in order to improve its graphical features for 3D modeling. These new 3D capabilities provide users a set of new view elements which can be used to develop models with a high degree of reality. In this way, Easy Java Simulations becomes a powerful tool to easily and quickly create 3D realistic simulations.

关键词： computer simulation modeling programming environment software tool virtual reality

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Optimal control for deterministic hybrid systems using dynamic programming

Optimal control for deterministic hybrid systems using dynam...

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作者： Rungger, Matthias Stursberg, Olaf Institute of Control and System Theory Department of Electrical Engineering and Computer Science University of Kassel Germany

ISBN: (纸本)9783902661593

Dynamic programming provides a method to solve hybrid optimal control problems. This contribution extends existing numerical methods originally developed for purely continuous systems, to a class of hybrid systems with autonomous as well as controlled switching behavior. The hybrid dynamics is approximated by a locally consistent discrete Markov decision process. The original optimal control problem is then reformulated for the Markov decision process and solved by standard dynamic programming methods. The convergence of the discrete approximation to the original problem is ensured. The viability of the numerical scheme is illustrated by a two gear transmission system used previously in literature.

关键词： Markov processes

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A communication-based distributed model predictive control scheme with time-varying consistency constraints 10

A communication-based distributed model predictive control s...

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2009 10th European control Conference, ECC 2009

作者： Dold, Johannes Stursberg, Olaf Institute of Control and System Theory Department of Electrical Engineering and Computer Science University of Kassel Germany

ISBN: (纸本)9783952417393

A communication-based distributed model predictive control scheme for a set of dynamically decoupled autonomous systems (agents) is proposed. The individual dynamics are described by discrete-time linear systems. Locally, each agent obeys a model predictive controller which minimizes a given local cost-function. Coupling between the agents occurs only through state-constraints. It is assumed that an initial feasible solution for the centralized optimization problem can only be found in a suboptimal manner due to computational limits. Then, the agents can decrease their local costs by replanning in each time step. This has to be done in a consistent way which is obtained by communicating local predicted trajectories under consideration of communication delays. © 2009 EUCA.

关键词： Cost functions

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Hierarchical hybrid modeling and control of flexible manufacturing systems 10

Hierarchical hybrid modeling and control of flexible manufac...

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2009 10th European control Conference, ECC 2009

作者： Paschedag, Tina Rungger, Matthias Ding, Hao Stursberg, Olaf Institute of Control and System Theory Department of Electrical Engineering and Computer Science University of Kassel Germany

ISBN: (纸本)9783952417393

In current manufacturing systems, short times for product development and ramp-up as well as high production rates and customized products are of increasing importance. To push the efficiency (and thus the economic gain) of production further, recent investigations combine aspects of flexible manufacturing systems with modeling and optimization techniques from the hybrid systems domain. Within this context, the contribution of this paper is two-fold: (1) a hierarchical modeling scheme is presented which suitably represents the plant dynamics on two distinct levels of detail comprising timed and hybrid automata, (2) an approach to adapt production online to changes in product specifications or production constraints by combining high-level generation of optimal production schedules with low-level learning- and model-based control. © 2009 EUCA.

关键词： Flexible manufacturing systems

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A boundary method for outlier detection based on support vector domain description

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Pattern Recognition 2009年第1期42卷 77-83页

作者： Guo, S.M. Chen, L.C. Tsai, J.S.H. Department of Computer Science and Information Engineering National Cheng-Kung University Tainan 701 Taiwan Control System Laboratory Department of Electrical Engineering National Cheng-Kung University Tainan 701 Taiwan

The support vector domain description (SVDD) is a popular kernel method for outlier detection, which tries to fit a class of data with a sphere and uses a few target objects to support its decision boundary. The problem is that even with a flexible Gaussian kernel function, the SVDD could sometimes generate such a loose decision boundary that the discrimination ability becomes poor. Therefore, a computationally intensive procedure called kernel whitening is often required to improve the performance. In this paper, we propose a simple post-processing method which tries to modify the SVDD boundary in order to achieve a tight data description with no need of kernel whitening. With the derivation of the distance between an object and its nearest boundary point in input space, the proposed method can efficiently construct a new decision boundary based on the SVDD boundary. The improvement from the proposed method is demonstrated with synthetic and real-world datasets. The results show that the proposed decision boundary can fit the shape of synthetic data distribution closely and achieves better or comparable classification performance on real-world datasets. © 2008 Elsevier Ltd. All rights reserved.

关键词： Data description

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