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2012 13th International Carpathian control Conference, ICCC 2012

作者： Kokes, J. Nghien, N.B. Dept. of Automatic Control and Engineering Informatics Czech Technical University in Prague Prague Czech Republic

ISBN: (纸本)9781457718687

Hilbert-Huang Transform (HHT), proposed by N. E. Huang in 1998, is a novel algorithm for nonlinear and non-stationary signal processing. The key part of this method is decomposition the signal into finite number of Intrinsic Mode Functions (IMF) which will meet the requirements of Hilbert Transform. In this part, the algorithm uses natural cubic spline to connect all local maxima and local minima to produce upper and lower envelope of the signal. However natural cubic spline which may lead overshoot and undershoot at intermediate point. In this paper we propose to apply constrained cubic spline into first part of the HHT to eliminate overshoot in upper and lower envelope. We also propose an improvement on Improved Slope Base Method (ISBM) to limit swing at the end points. The experiments showed that our proposals get better result than original proposal and speed up Empirical Mode Decomposition (EMD) process. © 2012 IEEE.

关键词： Empirical mode decomposition

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Permanent magnet synchronous motor optimization design for electric drives

Permanent magnet synchronous motor optimization design for e...

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International Symposium on Electrical and Electronics engineering (ISEEE)

作者： Ion Dobrota Madalin Costin Ion Voncila Grigore Fetecau Dept. of Automatic Control and Electrical Engineering “Dunarea de Jos” University of Galati Galati EU Romania Research Centre “ICSCP” “Dunarea de Jos” University of Galati Galati EU Romania

In this paper has been designed an optimal permanent magnet synchronous motor (PMSM) by using a coupled procedure composed by electric circuit equivalent scheme and finite elements method (FEM). The optimal solution is based on a minimization of specific cost of active materials by genetic algorithms. For this approach was taken into consideration different restrictions according to electromagnetic stress limits. The final solution is checked by running the operation characteristics.

关键词： Magnetic flux density Optimization Finite element analysis Materials Permanent magnet motors Electromagnetics Genetic algorithms

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A dynamic uplink scheduling scheme for WiMAX networks

A dynamic uplink scheduling scheme for WiMAX networks

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International Conference on Computer engineering and Systems

作者： Nada M. El-Shennawy Mohamed N. El-Derini Mostafa A. Youssef Mahmoud M. Fahmy Computers and Automatic Control Dept. Tanta University Tanta Egypt Computer Science and Engineering E-JUST Alexandria Egypt Vice Rector for Education and Student Affairs Pharos University Alexandria Egypt

Over the past few years, there has been a rapid growth of new services such as online video games, video conferences, and multimedia services to end users. WiMAX is an emerging technology for next generation wireless networks which supports a large number of users. To achieve Quality of Service (QoS) requirements, an efficient and reliable scheduling algorithm is urgently needed. Among a large number of the proposed approaches in the literature, a variably weighted round robin scheduling algorithm (VWRR) has been proven to provide the best performance in an IP backbone network with no attempts on WiMAX networks. This paper proposes a dynamic uplink scheduling algorithm for WiMAX networks based on VWRR to allocate the bandwidth to users to maximize the throughput and ensure the constraints of delay, jitter, and load. A comparative study between the proposed scheduling algorithm and the two most famous scheduling algorithms: weighted round robin algorithm (WRR) and modified deficit round robin algorithm (MDRR) over WiMAX networks, is presented. Simulation results obtained using OPNET reveal that the proposed algorithm has a superior performance compared with WRR with respect to throughput, delay, jitter, and load. Additionally, the proposed scheduling algorithm is shown to provide an excellent level of reliability and scalability when increasing the number of served subscriber stations.

关键词： WiMAX Uplink Quality of service Round robin Throughput Bandwidth

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Human-robot natural interaction and collision avoidance in flexible manufacturing cells

Human-robot natural interaction and collision avoidance in f...

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14th IFAC Symposium on Information control Problems in Manufacturing, INCOM'12

作者： Anton, Florin D. Anton, Silvia Borangiu, Theodor Dept. of Automatic Control and Applied Informatics University Politehnica of Bucharest Bucharest Romania

ISBN: (纸本)9783902661982

The paper discusses a new method of using robots to interact with humans (natural interaction) to provide assistance services. Using dept. sensors the robots are able to assist the human operator and to avoid collisions. Natural interaction is implemented using a dept. sensor which monitors the activity outside and inside the robot system workspace. The sensor extracts dept. data from the environment and then uses the processing power of a workstation in order to detect the humans and robot arms. This is done by detecting skeletons which represent the position and posture of the humans and manipulators. Using skeleton tracking, a software agent is able to monitor the movements of the human operators and robotic arms and to detect possible collisions and to stop the robot motion at the right time. Also the agent can interpret the posture (or full body gesture) of the human operator in order to send basic commands to the robot. © 2012 IFAC.

关键词： Industrial robots

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Actuator-fault Detection and Isolation based on Interval Observers and Invariant Sets

Actuator-fault Detection and Isolation based on Interval Obs...

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IEEE Annual Conference on Decision and control

作者： Feng Xu Vicen? Puig Carlos Ocampo-Martinez Florin Stoican Sorin Olaru Institut de Robotica i Informatica Industrial (CSIC-UPC) Technical University of Catalonia (UPC) Llorens i Artigas 4-6 08028 Barcelona Spain Dept. of Automatic Control and Systems Engineering Faculty of Automatic Control and Computers "Politehnica" University of Bucharest 313 Spl. Independentei 060042 Bucharest Romania E3S (SUPELEC Systems Sceinces) Automatic Control Departement Gif sur Yvette France

ISBN: (纸本)9781467357159;9781467357159

This paper proposes an interval observer-based actuator fault detection and isolation (FDI) approach. An interval observer matching the healthy system mode is designed to monitor the system. When the system is in different modes, state or output interval vectors predicted by the interval observer manifest different dynamical behaviors. To guarantee reliable FDI, a collection of invariant set-based FDI conditions are established. Under these conditions, actuator faults can be accurately detected and isolated during the transition between different modes. At the end, the effectiveness of this proposed approach is presented by using a numerical example.

关键词： FDI Actuator-fault Detection Invariant Sets

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Online rapid vision integration for a robotized China plates manufacturing line

Online rapid vision integration for a robotized China plates...

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14th IFAC Symposium on Information control Problems in Manufacturing, INCOM'12

作者： Anton, Florin D. Anton, Silvia Borangiu, Theodor Dept. of Automatic Control and Applied Informatics University Politehnica of Bucharest Bucharest Romania

ISBN: (纸本)9783902661982

In conventional robot systems the different robot parts (sensors, processing elements and actuators) are combined together in a compact, self contained system. The need for faster development and deployment, system reconfigurability and flexibility required the introduction of rapid deployment automation for robot systems in flexible manufacturing cells. Vision sensors are one of the most important sensors in robot systems. When constructing a new robot system, it is desirable that vision and image processing components are just as easily integrated as any other robot components. In some situations robot stations must be upgraded with vision systems in order to accomplish new tasks or to enhance the current work, here the Rapid Deployment Automation concept is the base to solve such problems in a shorter time having the smallest impact over the production flow in terms of production downtime. The paper describes an RDA solution of vision upgrade for robot stations in a china objects production plant. © 2012 IFAC.

关键词： Robot vision

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Structured coprime factorizations description of Linear and Time-Invariant networks

Structured coprime factorizations description of Linear and ...

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IEEE Conference on Decision and control

作者： Şerban Săbau Cristian Oară Sean Warnick Ali Jadbabaie Stevens Institute of Technology Hoboken NJ US Faculty of the Automatic Control Dept. University “Politehnica” Bucharest Romania The Faculty of the Computer Science Department Brigham Young University Faculty of the Electrical and Systems Engineering Dept University of Pennsylvannia

In this paper we study state-space realizations of Linear and Time-Invariant (LTI) systems. Motivated by biochemical reaction networks, Gonçalves and Warnick have recently introduced the notion of a Dynamical Structure Functions (DSF), a particular factorization of the system's transfer function matrix that elucidates the interconnection structure in dependencies between manifest variables. We build onto this work by showing an intrinsic connection between a DSF and certain sparse left coprime factorizations. By establishing this link, we provide an interesting systems theoretic interpretation of sparsity patterns of coprime factors. In particular we show how the sparsity of these coprime factors allows for a given LTI system to be implemented as a network of LTI sub-systems. We examine possible applications in distributed control such as the design of a LTI controller that can be implemented over a network with a pre-specified topology.

关键词： Transfer functions Equations Indium phosphide Mathematical model Network topology Topology Electronic mail

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PEDESTRIAN GROUP TRACKING USING THE GM-PHD FILTER

PEDESTRIAN GROUP TRACKING USING THE GM-PHD FILTER

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European Signal Processing Conference

作者： Viktor Edman Maria Andersson Karl Granstr?m Fredrik Gustafsson Div of Sensor Informatics Dept of Sensor & EW Systems Swedish Defence Research Agency SE-581 11 Link?ping Sweden Div of Automatic Control Dept of Electrical Engineering Link?ping University SE-581 83 Link?ping Sweden

ISBN: (纸本)9781479936878

A GM-PHD filter is used for pedestrian tracking in a crowd surveillance application. The purpose is to keep track of the different groups over time as well as to represent the shape of the groups and the number of people within the groups. Input data to the GM-PHD filter are detections using a state of the art algorithm applied to video frames from the PETS 2012 benchmark data. In a first step, the detections in the frames are converted from image coordinates to world coordinates. This implies that groups can be defined in physical units in terms of distance in meters and speed differences in meters per second. The GM-PHD filter is a Bayesian framework that does not form tracks of individuals. Its output is well suited for clustering of individuals into groups. The results demonstrate that the GM-PHD filter has the capability of estimating the correct number of groups with an accurate representation of their sizes and shapes.

关键词： Multi target tracking group target tracking GM-PHD groups

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Wireless Sensor Networks Clock Synchronization with Selective Convergence Rate

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IFAC Proceedings Volumes 2013年第10期46卷 146-151页

作者： Francesco Lamonaca Andrea Gasparri Emanuele Garone Dept. of Informatics Models Electronic and Systems University of Calabria Ponte Pietro Bucci 87040 Rende (CS) Italy Dept. of Engineering University of “Roma Tre” Via della Vasca Navale 79 Roma 00146 Italy Faculty of Applied Science Control and Systems Analysis Department Université Libre de Bruxelles 1050 Brussels Belgium

This paper focuses on the Wireless Sensor Network (WSN) synchronization problem for event-driven measurement applications. The objective is twofold: i) to provide high accuracy in the area where an event is detected, ii) to ensure a long network life time. These two objectives are conflicting. In fact, to increase the synchronization accuracy packets must be exchanged at higher rate, thus affecting the network lifetime. In several interesting applications a trade-off can be achieved based on the observation that, if the goal is to observe a localized event, only the portion of the network surrounding the detected event requires a higher accuracy. The proposed algorithm represents a formalization of this idea. Simulations are done to show the effectiveness of the proposed algorithm.

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Research on electromagnetic susceptibility of fiber optical gyroscope

Research on electromagnetic susceptibility of fiber optical ...

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2012 International Symposium on Photonics and Optoelectronics, SOPO 2012

作者： Liu, Jieyu Xu, Junhui Ma, Xuewen Dept. of Automatic Control Second Artillery Engineering University Xi'an China

ISBN: (纸本)9781457709111

As an new optical instrument, Fiber Optical Gyroscope (FOG) is used in guidance and navigation system more and more. But the problem is that it can be disturbed by electromagnetic environment easily. According to apply electromagnetic interference signal with different strength and frequency, an electromagnetic environment simulation system is presented to study its electromagnetic susceptibility based on the test data by model building analysis method and variance analysis method. © 2012 IEEE.

关键词： Electromagnetic pulse

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