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检索条件"任意字段=International Conference on Complex Systems: Control and Modeling Problems"

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A constraint-based approach for managing declarative temporal business process models 27

A constraint-based approach for managing declarative tempora...

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27th international conference on Information systems Development: Designing Digitalization, ISD 2018

作者： Jiménez-Ramírez, Andrés Barba, Irene Del Valle, Carmelo Departamento de Lenguajes y Sistemas Informáticos Universidad de Sevilla Seville Spain

ISBN: (纸本)9789177538769

There is an increasing interest in aligning information systems in a process-oriented way. As an alternative of the traditional imperative models which tend to be too rigid, processes may be specified in a declarative (e.g., constraint-based) way. Nonetheless, in general, offering operational support (e.g., generating possible execution traces) to declarative business process models entails more complexity when compared to imperative modeling alternatives. Such support becomes even more complex in many real scenarios where the management of complex temporal relations between the process activities is crucial (i.e., the temporal perspective should be managed). Despite the needs for enabling process flexibility and dealing with temporal constraints, most existing tools are unable to manage both. In a previous work, we then proposed TConDec-R, which is a constraint-based process modeling language which allows for the specification of temporal constraints. However, TConDec-R revealed a number of limitations that are overcome with the present work. More specifically, this paper significantly extends and improves our previous work by (1) defining TConDec-R process models based on high-level elements from the constraint programming paradigm, (2) introducing a constraint-based tool with a client/server architecture for providing operational support to TConDec-R process models, and (3) performing an empirical evaluation of the approach. © Designing Digitalization, ISD 2018. All rights reserved.

关键词： Constraint satisfaction problems

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Synchronization and Aggregation of Nonlinear Power systems with Consideration of Bus Network Structures 16

Synchronization and Aggregation of Nonlinear Power Systems w...

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European control conference (ECC)

作者： Mlinaric, Petar Ishizaki, Takayuki Chakrabortty, Aranya Grundel, Sara Benner, Peter Imura, Jun-ichi Max Planck Inst Dynam Complex Tech Syst Computat Methods Syst & Control Theory D-39106 Magdeburg Germany Tokyo Inst Technol Sch Engn Dept Syst & Control Engn 2-12-1 Meguro Tokyo Japan North Carolina State Univ Elect & Comp Engn Raleigh NC 27695 USA

ISBN: (纸本)9783952426982

We study nonlinear power systems consisting of generators, generator buses, and non-generator buses. First, looking at a generator and its bus' variables jointly, we introduce a synchronization concept for a pair of such joint generators and buses. We show that this concept is related to graph symmetry. Next, we extend, in two ways, the synchronization from a pair to a partition of all generators in the networks and show that they are related to either graph symmetry or equitable partitions. Finally, we show how an exact reduced model can be obtained by aggregating the generators and associated buses in the network when the original system is synchronized with respect to a partition, provided that the initial condition respects the partition. Additionally, the aggregation-based reduced model is again a power system.

关键词： Generators Synchronization Symmetric matrices Power system dynamics Mathematical model Load modeling

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Multiphysics Analysis of Automotive PMaSynRM

Multiphysics Analysis of Automotive PMaSynRM

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international IEEE conference and Workshop: Óbuda on Electrical and Power Engineering (CANDO-EPE)

作者： Attila Nyitrai Gergely Szabó Sándor Horváth István Vajda E-mobility Research Center Széchenyi István University Gyõr Hungary 9026

ISBN: (数字)9781728143583

ISBN: (纸本)9781728143590

The purpose of a Multiphysics Analysis is the modeling of complex physical systems where different kinds of physical effects act simultaneously. We would like to predict the behavior of a machine with the least number of neglected effects. Nowadays more Finite Element Method (FEM) based simulation software are readily available to study the physics of an electrical machine. Although, there are no standardized solutions that would fit every kind of electric motor analysis. In this paper we will present a method how to go through step-by-step on the different physical phenomena of an electrical machine and therefore analyze the different design and working aspects.

关键词： Multiphysics FEM Drive control Simulation Electromagnetic Thermal Structural Finite element method electric machines ELECTROMAGNETIC Thermal Physical Phenomena emulation program automotive engineering

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Disturbance Compensation and control Algorithm with Application for Non-linear Twin Rotor MIMO System 12th

Disturbance Compensation and Control Algorithm with Applicat...

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12th international conference on Mechatronics

作者： Margun, Alexey Furtat, Igor Bazylev, Dmitry Kremlev, Artem ITMO Univ Control Syst & Informat Dept St Petersburg Russia Inst Problems Mech Engn Control Complex Syst Lab St Petersburg Russia

ISBN: (纸本)9783319659602;9783319659596

The disturbance compensation algorithm for continuous-time multi input multi output (MIMO) nonlinear plants under parametric uncertainties and external disturbances with quantized output signal is proposed. The auxiliary loop approach is used for estimation disturbance function. The proposed algorithm guarantees that the output of the plant tracks the reference output with the required accuracy. The experimental results on non-linear twin rotor MIMO system illustrate the efficiency and robustness of the suggested control system.

关键词： Robust control Quantized measurement Disturbances compensation MIMO systems

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Development of protection object model - Industrial control system using system analysis

Development of protection object model - Industrial control ...

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2018 international Russian Automation conference, RusAutoCon 2018

作者： Mashkina, Irina Garipov, Ildar Ufa State Aviation Technical University Ufa Russia

ISBN: (纸本)9781538649381

This article presents an analysis of industrial control system (ICS), its multilevel structure and operation conditions. The ICS infrastructure is considered as a part of enterprise information system (EIS). The problem of information security of ICS is discussed. The reasons why ICS information security has become one of the most discussed issues of our time is defined. A model of EIS infrastructure comprising industrial control system is suggested. A verbal model of ICS as a protection object of information security system (ISS) is developed. The model takes into account all computer equipment, communication lines, channels, components of the three ICS levels. The necessary of a development of such models is substantiated according to the system analysis method. modeling is an effective tool for studying the characteristics of complex systems and makes it possible to have a closer look at their structure. A successful development of ISS depends on the adequacy of a protection object model (ICS), taking into account its specific features. © 2018 IEEE.

关键词： SCADA systems

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Using a Memory of Motion to Efficiently Warm-Start a Nonlinear Predictive controller

Using a Memory of Motion to Efficiently Warm-Start a Nonline...

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IEEE international conference on Robotics and Automation (ICRA)

作者： Mansard, N. Del Prete, A. Geisert, M. Tonneau, S. Stasse, O. Univ Toulouse CNRS LAAS Toulouse France

ISBN: (纸本)9781538630815

Predictive control is an efficient model-based methodology to control complex dynamical systems. In general, it boils down to the resolution at each control cycle of a large nonlinear optimization problem. A critical issue is then to provide a good guess to initialize the nonlinear solver so as to speed up convergence. This is particularly important when disturbances or changes in the environment prevent the use of the trajectory computed at the previous control cycle as initial guess. In this paper, we introduce an original and very efficient solution to automatically build this initial guess. We propose to rely on off-line computation to build an approximation of the optimal trajectories, that can be used on-line to initialize the predictive controller. To that end, we combined the use of sampling-based planning, policy learning with generic representations (such as neural networks), and direct optimal control. We first propose an algorithm to simultaneously build a kinodynamic probabilistic roadmap (PRM) and approximate value function and control policy. This algorithm quickly converges toward an approximation of the optimal state-control trajectories (along with an optimal PRM). Then, we propose two methods to store the optimal trajectories and use them to initialize the predictive controller. We experimentally show that directly storing the state-control trajectories leads the predictive controller to quickly converges (2 to 5 iterations) toward the (global) optimal solution. The results are validated in simulation with an unmanned aerial vehicle (UAV) and other dynamical systems.

关键词： Computational modeling Approximation algorithms Optimal control Planning Robots Trajectory optimization"

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State Estimation and Fault Detection for Nonlinear Dynamic systems 37

State Estimation and Fault Detection for Nonlinear Dynamic S...

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37th Chinese control conference (CCC)

作者： Lu, Baohua Yan, Liping Chen, Hongxue Xia, Yuanqing Fu, Mengyin Xiao, Bo Beijing Inst Technol Sch Automat Key Lab Intelligent Control & Decis Complex Syst Beijing 100081 Peoples R China Beijing Univ Posts & Telecommun Sch Informat & Commun Engn Beijing 100876 Peoples R China

ISBN: (纸本)9789881563958

In practical problems, the dynamic systems are usually nonlinear. In this case, the traditional Kalman filter cannot be used for state estimation or fault detection. The two typical extension based on Kalman filtering framework is the Extended Kalman Filter ( EKF) and the Unscented Kalman Filter ( UKF). Theoretically speaking, UKF is better than EKF when estimation accuracy is concerned, especially for high degree nonlinear cases. This paper is concerned with the state estimation and fault detection problem for a class of nonlinear dynamic systems. A novel fault detection and analyse method is presented based on the period residual of EKF and UKF. For different kind of faults, mainly, the system parameter error, the sensor/data error, EKF and UKF are used, and the estimation and fault detection effects are compared and analyzed.

关键词： nonlinear system state estimation fault detection parameter error sensor error

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A bicycle simulator for experiencing microscopic traffic flow simulation in urban environments 21

A bicycle simulator for experiencing microscopic traffic flo...

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21st IEEE international conference on Intelligent Transportation systems (ITSC)

作者： Keler, Andreas Kaths, Jakob Chucholowski, Frederic Chucholowski, Maximilian Grigoropoulos, Georgios Spangler, Matthias Kaths, Heather Busch, Fritz TUM Chair Traff Engn & Control Munich Germany TESIS Gesell Tech Simulat & Software mbH Munich Germany

ISBN: (纸本)9781728103235

Urban environments often imply complex transportation infrastructures with manifold different traffic participant using various modes of transport. These traffic participants interact with each other in different ways, often in specific patterns of communication. One option for understanding these interactions may come from microscopic traffic flow simulations. Simulated traffic on modelled urban transportation infrastructures may deliver insights on general traffic-related problems or show specific locations of high risk of accidents or of low traffic quality. Besides having a general view on microscopic traffic flow simulation results, we propose one option for experiencing these simulations from a first-person perspective visualization as one interacting traffic participant on a non-moving physical bicycle. We introduce a procedure for implementing a bicycle simulator for testing various scenarios in three-dimensional environments. By including individual realtime bicycle movements of test subjects into ongoing traffic simulations, we are able to derive individual behavioral strategies to cope with the modelled transportation infrastructure and with simulated vehicle drivers, bicyclists and pedestrians from the point of view of an urban bicyclist. We aim to introduce a novel technique for (1) analyzing present problems of traffic and built infrastructural elements, and, (2) inspecting planned scenarios with variations in traffic compositions (participants and modes) and built infrastructure (inclusion of new design elements). One first test scenario is implemented for gaining first insights on the usefulness of the presented device.

关键词： bicycle simulator microscopic traffic flow simulation three-dimensional visualization bicycle traffic urban traffic

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Introduction of Additional Links as a Form of Purposeful Change of Dynamic States in the Tasks of the Dynamics and Automatic control of Robotic and Technological complexes

Introduction of Additional Links as a Form of Purposeful Cha...

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IEEE conference on Quality Management, Transport and Information Security, Information Technologies (IT&MQ&IS)

作者： Sergey V. Eliseev Ilya I. Livshitz Pawel A. Lontsikh Olga M. Stefanovskay Irkutsk State Transport University Irkutsk Russia ITMO University St. Petersburg Russia National Research Irkutsk State Technical University Irkutsk Russia

ISBN: (纸本)9781728125961

The article considers problems of the dynamics of the transport object, oriented to improve the reliability and safety of operation in terms of vibrational external perturbations. It proposes technologies for constructing mathematical models and determining the conditions for dynamic oscillation damping. The purpose of research is to develop a method for constructing mathematical models to estimate dynamic states and determine the conditions for obtaining dynamic effects of “zeroing out” of movements in individual coordinates. To achieve this, methods of structural mathematical modeling are used. The scientific novelty of the work involves the possibility of assessing the formation of dynamic states of mechanical oscillatory systems with the introduction of additional constraints. A technology has been developed for the transition from the transfer functions of systems to the equations of state to estimate the frequencies of dynamic oscillation damping.

关键词： Robot kinematics Mathematical model Perturbation methods Kinematics Transfer functions Dynamics

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Industrial Internet of Things based Cycle Time control of Assembly Lines

Industrial Internet of Things based Cycle Time Control of As...

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IEEE international conference on Future IoT Technologies (Future IoT)

作者： Ruppert, Tamas Abonyi, Janos Univ Pannonia Inst Chem & Proc Engn MTA PE Lendulet Complex Syst Monitoring Res Grp H-8200 Veszprem Hungary

ISBN: (纸本)9781538612088

Dynamic cycle time setting and line balancing are the most significant problems in modular manufacturing. Industry 4.0 and IIoT (Industrial Internet of Things) based production management systems connect decentralized production units and information sources to increase productivity and flexibility. We developed an IIoT based solution to ensure a real-time connection between products and assembly lines. The proposed dynamic cycle time setting algorithm takes into account the varying complexity of the product based on the real-time information provided by smart wireless sensors and an Indoor Positioning System (IPS). In this paper, we overview Industry 4.0 based assembly line management solutions, present the developed IIoT based infrastructure, and demonstrate the applicability of the proposed cycle time setting algorithm in a simulation example motivated by an industrial open station conveyor.

关键词： IIoT Paced conveyor Cycle time control

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