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检索条件"主题词=Computer algorithms"

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Digital Adaptive Driving Strategies for High-Voltage IGBTs

Digital Adaptive Driving Strategies for High-Voltage IGBTs

引用

2011 IEEE Energy Conversion Congress and Exposition (ECCE 2011)

作者： Lan Dang Harald Kuhn Axel Mertens Institute for Drive Systems and Power Electronics Leibniz University Hannover D-30167 Welfengarten 1 Hannover Germany

ISBN: (纸本)9781457705427;9781457705410

Digital technology incorporated into the gate drive unit of HV-IGBTs allows new features, like automatic optimization of the gate current waveforms for achieving certain properties of the switching transients, or automatic adaptation to the operating conditions. This paper presents a digital gate unit with on-line measurement of the IGBT's switching waveforms. Based on this, a robust control algorithm is developed to adapt the gate current waveforms to the desired switching behavior, irrespective of the operating conditions. The algorithm is implemented in a Field-Programmable Gate Array (FPGA) on the gate unit and experimentally verified for several optimization objectives using 3.3 kV and 1200 A IGBTs.

关键词： insulated gate bipolar transistors gate current DRIVES High Voltage waveforms adaptive optimization DIGITAL TECHNIQUES Field programmable gate arrays gates computer algorithms

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Learning-based Controller for Robotic Manipulators with Grey Learning Rate

Learning-based Controller for Robotic Manipulators with Grey...

引用

IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM)

作者： Han-Pang Huang Shin-Wei Lin Jiu-Lou Yan Tzu-Hsin Kuo Yang-Lun Liu Department of Mechanical Engineering National Taiwan University Taipei Taiwan 10617 China Industrial Technology Research Institute Hsinchu Taiwan 31040 China

ISBN: (纸本)9781457708381

This paper is aimed to design a learning-based controller for robotic manipulators. A controller is proposed to estimate the nonlinear system dynamics and minimize tracking error in motion. In order to improve the learning speed and performance, a new CMAC (cerebellar model articulation controller) controller with grey learning rate is proposed. The grey learning rate, which is based on a grey relational analysis, is utilized to adjust the learning rate online. Real-time tracking control can be achieved with the proposed controller. To demonstrate the performance of the proposed controller, ADMAS and MATLAB/Simulink are used for simulation. The NI sbRIO-9642 is employed to realize the control algorithm on the NTU robot arm, which is developed by our laboratory. The simulation and experimental results show that the proposed learning-based controller can provide better tracking performance than the conventional ones.

关键词： Robot Manipulator learning rate Controllers computer algorithms System dynamics CMAC Manipulators grey

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The development of quadruped giant puppet based on 3D graphic animation

The development of quadruped giant puppet based on 3D graphi...

引用

IEEE International Conference on Robotics and Biomimetics

作者： SangWon Lee JinYoung Kim OHung Kwon KwanYoung Joung DaeHee Won KyungHwa Rim Korea Inst. of Ind. Technol.(KITECH) Incheon South Korea

ISBN: (纸本)9781457721366

The purpose of this paper is to realize a stable and natural walking pattern for quadruped giant puppets. The entertainment industry has proven to be an extensive market for quadruped animals. A life-size dinosaur that was manufactured for a show has been the subject of this paper. 3D graphic animation capture method has been introduced for data acquisition and was exercised for lifelike motion through control algorithm and dynamic simulation. The data will play a major role in enabling natural motion. Puppets will be an aggressive application in the robot technology.

关键词： Robotic Technology Puppets Three-Dimensional Images Animation computer algorithms Entertainment industry Data Collection Methods giant stars Gigantism

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Data Center Transport Mechanisms: Congestion Control Theory and IEEE Standardization

Data Center Transport Mechanisms: Congestion Control Theory ...

引用

Annual Allerton Conference on Communication, Control, and Computing

作者： Mohammad Alizadeh Berk Atikoglu Abdul Kabbani Ashvin Lakshmikantha Rong Pan Balaji Prabhakar Mick Seaman Department of Electrical Engineering Stanford University Department of Computer Science Stanford University Broadcom Corporation San Jose Cisco Systems San Jose Departments of Electrical Engineering and Computer Science Stanford University Security Task Group

ISBN: (纸本)9781424429257

Data Center Networks present a novel, unique and rich environment for algorithm development and deployment. Projects are underway in the IEEE 802.1 standards body, especially in the Data Center Bridging Task Group, to define new switched Ethernet functions for data center use. One such project is IEEE 802.1Qau, the Congestion Notification project, whose aim is to develop an Ethernet congestion control algorithm for hardware implementation. A major contribution of this paper is the description and analysis of the congestion control algorithm-QCN, for Quantized Congestion Notification - which has been developed for this purpose. A second contribution of the paper is an articulation of the Averaging Principle: a simple method for making congestion control loops stable in the face of increasing lags. This contrasts with two well-known methods of stabilizing control loops as lags increase;namely, (i) increasing the order of the system by sensing and feeding back higher-order derivatives of the state, and (ii) determining the lag and then choosing appropriate loop gains. Both methods have been applied in the congestion control literature to obtain stable algorithms for high bandwidth-delay product paths in the Internet. However, these methods are either undesirable or infeasible in the Ethernet context The Averaging Principle provides a simple alternative, one which we are able to theoretically characterize.

关键词： data center control ring INSTITUTE OF ELECTRICAL AND ELECTRONIC ENGINEERS Instruction repertory computer algorithms Joints Control Theory Ethernet networks notification closed-loop gain

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Programmable Logic Controller based Embedded Quadratic Programming for input-constrained Internal Model Control

Programmable Logic Controller based Embedded Quadratic Progr...

引用

European Control Conference

作者： Ambrose. A. Adegbege Eric Mauro Department of Electrical and Computer Engineering The College of New Jersey

ISBN: (纸本)9781467371605

Advanced control algorithms such as optimization-based controls are known to offer superior performance as well as systematic constraints handling when compared to classical control strategies. However, the complexity of such advanced control methods makes their implementations difficult, especially on controllers with limited computational capacity such as the programmable logic controllers (PLC). This paper presents the capability of a low-cost low-end PLC for online computation of advanced control. In particular, an online quadratic program within the framework of input-constrained internal model control is implemented, and the effectiveness is illustrated using a hardware-in-the-loop experiment.

关键词： Programmable logic controllers logic controller quadratic programming Advanced controls Model control internal model control computer algorithms Control Methods PROGRAMMABLE Controllers

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Local Independent Control of Cognitive Radio Networks

Local Independent Control of Cognitive Radio Networks

引用

3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)

作者： Christian Doerr Dirk Grunwald Douglas C. Sicker Department of Computer Science University of Colorado Boulder CO USA

ISBN: (纸本)9781424423019

Many different algorithms for managing cognitive radio networks have been proposed. While these algorithms have applied the whole range from centrally managed to distributed control schemes, a common feature of previous work is the reliance on explicit communication to exchange and negotiate configuration information. This paper describes a new class of cognitive radio control algorithms employing local independent control based upon swarming behavior found in nature. We examine the feasibility of such local independent control in a testbed implementation of the algorithm, configuring and dynamically adapting a cognitive radio network. We find that approach is suited to coordinate a cognitive radio network based on passive observation of its environment only and may coordinate with other control algorithms deployed in heterogeneous secondary user networks.

关键词： Cognitive radio Radio networks independent control computer algorithms Swarming behavior algorithms FULL-SCALE Reliance resin cement New classes Online resources

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A Hardware-In-the-Loop Setup for Rapid Control Prototyping of Mechatronic Systems

A Hardware-In-the-Loop Setup for Rapid Control Prototyping o...

引用

IEEE Conference on Emerging Technologies and Factory Automation

作者： Luca Simoni Manuel Beschi Davide Colombo Antonio Visioli Riccardo Adamini Dipartimento di Ingegneria Meccanica e Industriale University of Brescia Istituto di Tecnologie Industriali e Automazione National Research Council Gefran SpA

ISBN: (纸本)9781467379304

In this paper we present a Hardware-In-the-Loop setup for the simulation of complex mechatronic systems. The setup consists of two coupled brushless motors. One of them is the motor under test, which is used to design the control algorithm and to test the control software, while the other one simulates the device to be controlled. Libraries of mechanical and hydraulic components have been implemented in an IEC61131-3 language so that a complex system can be simulated in a relatively easy way and this allows for a rapid control prototyping. Practical issues are discussed and an illustrative example is shown to confirm the effectiveness of the setup.

关键词： HARDWARE IN THE LOOP computer algorithms Microelectromechanical devices hydraulic cells Complex systems PROTOTYPE simulating computer hardware Brushless motors Motor Standing Orders

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Utility Functionals Associated With Available Congestion Control algorithms

Utility Functionals Associated With Available Congestion Con...

引用

2010 Proceedings IEEE INFOCOM

作者： Javad Lavaei John C. Doyle Steven H. Low Department of Control and Dynamical Systems California Institute of Technology Computer Science and Electrical Engineering Departments California Institute of Technology

ISBN: (纸本)9781424458363

This paper is concerned with understanding the connection between the existing Internet congestion control algorithms and the optimal control theory. The available resource allocation controllers are mainly devised to derive the state of the system to a desired equilibrium point and, therefore, they are oblivious to the transient behavior of the closed-loop system. To take into account the real-time performance of the system, rather than merely its steady-state performance, the congestion control problem should be solved by maximizing a proper utility functional as opposed to a utility function. For this reason, this work aims to investigate what utility functionals the existing congestion control algorithms maximize. In particular, it is shown that there exist meaningful utility functionals whose maximization leads to the celebrated primal, dual and primal/dual algorithms. An implication of this result is that a real network problem may be solved by regarding it as an optimal control problem on which some practical constraints, such as a real-time link capacity constraint, are imposed.

关键词： computer algorithms FUNCTIONALS System performance equilibrium point Utility functions Transient performance real-time link

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Novel Power Control Algorithm by Decomposed Geometric Programming Method for CDMA Cognitive Radio Networks

Novel Power Control Algorithm by Decomposed Geometric Progra...

引用

IEEE International Conference on Communications

作者： Mohamed Elalem Electrical and Computer Engineering Department Ryerson University

ISBN: (纸本)9781457720529

Traditionally, the frequency spectrum is licensed to users in a rigid manner where the licensee has the exclusive right to access the allocated band. However, an unlicensed (cognitive) user may share a frequency band with a licensed (primary) owner as long as the interference is below a certain threshold. This makes power control a critical important issue in these networks. In this paper, we consider a decentralized power control algorithm that satisfies the most two significant metrics in cognitive radio network, capacity of cognitive network and total interference to primary users. The problem might be formulated as a power optimization problem, where rate allocation and power control are modeled through the objective function in which each user utility depends not only on its variables but also on the variables of other user utilities. Geometric Programming (GP) Problem is used to convert nonconvex optimization problem to convex optimization problem by introducing auxiliary variables and adding extra equality constraints, thus transferring the coupling in the objective to coupling in the constraints, which can be decoupled by primal-dual decomposition method, then can be efficiently solved even with a large number of users. The benefits of the method are illustrated through numerical results.

关键词： Power control computer algorithms GEOMETRIC PROGRAMMING Cognitive radio Frequency bands Consumers Frequency spectra Radio networks Code division multiple access

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Finite Control Set MPC of an AFE Rectifier with Dynamic References

Finite Control Set MPC of an AFE Rectifier with Dynamic Refe...

引用

2010 IEEE International Conference on Industrial Technology (ICIT 2010)

作者： Daniel E. Quevedo Ricardo P. Aguilera Marcelo A. Perez Patricio Cortes School of Electrical Engineering and Computer Science The University of Newcastle Callaghan NSW 2308 Australia Departamento de Electronica Universidad Tecnica Federico Santa Maria Valparaiso Chile

ISBN: (纸本)9781424456956

We present a model predictive controller for closed loop control of an active front-end rectifier. Our method operates in discrete-time and does not require additional modulators or external control loops. The key novelty of the control algorithm presented lies in the way dynamic references are handled. Simulation studies illustrate that fast and accurate tracking of dynamic dc-voltage and reactive power references can be achieved, while respecting restrictions on maximum power levels of the rectifier.

关键词： Rectifiers computer algorithms Predictive controllers control ring control set Reactive power discrete-time Maximum Allowable Concentration power level CLOSED LOOP CONTROL

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