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The bandwidth differentiated service of web server

Journal of Computers (Taiwan) 2016年第3期27卷 163-176页

作者： Hu, Yan-Su Gao, Ang Mu, De-Jun School of Electronics and Control Engineering Chang'an University Southern Middle Section Second Circular Road Xi'an China School of Electronics and Information Northwestern Polytechnical University No. 127 West Youyi Road Xi'an China School of Automation Northwestern Polytechnical University No. 127 West Youyi Road Xi'an China

Differentiated service which belongs to the research of internet QoS means the requests with high priority should receive the quality of service "at least not lower than" the low priority. As we know, what clients most concerned is whether there is a small delay for an important request. The client-perceived delay is composed of connection delay and processing delay. So far, the QoS researches most focus on the connection delay that can be controlled by the threads / processes allocation. However, the experiments show that it is invalid when the bandwidth becomes the resource bottleneck. For this issue, the paper proposes bandwidth based QoS architecture to takes the processing delay into consideration. The self-tuning controller adjusts the bandwidth allocated to different virtual hosts to control the processing delay. The experiments show that the algorithm not only achieves the proportional delay guarantees but also emerges its advantage on the stability. Compared with the static fuzzy controller, the variance between the real delay proportion and the expect value is deceased 40% by the self-tuning control. © 2016, Computer Society of the Republic of China. All rights reserved.

关键词： Quality of service

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Fault diagnosis and fault tolerant control with application on a wind turbine low speed shaft encoder 9

Fault diagnosis and fault tolerant control with application ...

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9th IFAC Symposium on Fault Detection, Supervision and Safety for Technical Processes, SAFEPROCESS 2015

作者： Odgaard, Peter Fogh Sanchez, Hector Escobet, Teresa Puig, Vicenç Section of Automation and Control Department of Electronic Systems Aalborg University Fredrik Bajers Vej 7C Aalborg9220 Denmark Rambla Sant Nebridi 22 Terrassa08222 Spain

In recent years, individual pitch control has been developed for wind turbines, with the purpose of reducing blade and tower loads. Such algorithms depend on reliable sensor information. The azimuth angle sensor, which positions the wind turbine rotor in its rotation, is quite important. This sensor has to be correct as blade pitch actions should be different at different azimuth angle as the wind speed varies within the rotor field due to different phenomena. A scheme detecting faults in this sensor has previously been designed for the application of a high end fault diagnosis and fault tolerant control of wind turbines using a benchmark model. In this paper, the fault diagnosis scheme is improved and integrated with a fault accommodation scheme which enables and disables the individual pitch algorithm based on the fault detection. In this way, the blade and tower loads are not increased due to individual pitch control algorithm operating with faulty azimuth angle inputs. The proposed approach is evaluated on a wind turbine benchmark model, which is based on the FAST aero-elastic code provided by NREL. © 2015, IFAC (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Wind turbines

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Health-aware model predictive control of Wind turbines using fatigue prognosis 9

Health-aware model predictive control of Wind turbines using...

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9th IFAC Symposium on Fault Detection, Supervision and Safety for Technical Processes, SAFEPROCESS 2015

作者： Sanchez, Hector Escobet, Teresa Puig, Vicenç Odgaard, Peter Fogh Rambla Sant Nebridi 22 Terrassa08222 Spain Department of Electronic Systems Automation and Control Section Aalborg University Fredrik Bajers Vej 7C Aalborg9220 Denmark

Wind turbines components are subject to considerable fatigue due to extreme environmental conditions to which are exposed, especially those located offshore. Interest in the integration of control with fatigue load minimization has increased in recent years. The integration of a system health management module with the control provides a mechanism for the wind turbine to operate safely and optimize the trade-off between components life and energy production. The research presented in this paper explores the integration of model predictive control (MPC) with fatigue-based prognosis approach to minimize the damage of wind turbine components (the blades). The controller objective is modified by adding an extra criterion that takes into account the accumulated damage. The scheme is implemented and tested using a high fidelity simulator of a utility scale wind turbine. © 2015, IFAC (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Wind turbines

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Importance of Dynamic Inflow in Model Predictive control of Wind Turbines

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IFAC-PapersOnLine 2015年第30期48卷 90-95页

作者： Peter Fogh Odgaaard Torben Knudsen Anders Overgaard Henrik Steffensen Marten Jørgensen Section of Automation and Control Aalborg University Denmark Msc.EE students in 2014 at Aalborg University Aalborg Denmark

The efficiency of including dynamic inflow in the model based design of wind turbine controller has been discussed for many years in the wind energy community with out getting to a safe conclusion. This paper delivers a good argument in favor of including dynamic inflow. The main contributions are the use of a very simple inflow model, developed by one of the authors and the use of Pareto fronts to facilitate a safe conclusion. The approach is to compare MPC controllers designed with respectively without including dynamic inflow for a mean wind speed just above rated where this dynamics are most pronounces. For this the well accepted NREL 5MW reference turbine simulated with FAST is used. The main result is a reduction in tower fatigue load at 22% while power error, rotor speed error, generator torque and pitch rate is improved from 2 to 33%.

关键词： Wind Turbines Model Predictive control Dynamic Inflow

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Roadmap on Quantum Thermodynamics

arXiv

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arXiv 2025年

作者： Campbell, Steve D’Amico, Irene Ciampini, Mario A. Anders, Janet Ares, Natalia Artini, Simone Auffèves, Alexia Oftelie, Lindsay Bassman Bettmann, Laetitia P. Bonança, Marcus V.S. Busch, Thomas Campisi, Michele Cavalcante, Moallison F. Correa, Luis A. Cuestas, Eloisa Dag, Ceren B. Dago, Salambô Deffner, Sebastian Del Campo, Adolfo Deutschmann-Olek, Andreas Donadi, Sandro Doucet, Emery Elouard, Cyril Ensslin, Klaus Erker, Paul Fabbri, Nicole Fedele, Federico Fiusa, Guilherme Fogarty, Thomás Folk, Joshua Guarnieri, Giacomo Hegde, Abhaya S. Hernández-Gómez, Santiago Hu, Chang-Kang Iemini, Fernando Karimi, Bayan Kiesel, Nikolai Landi, Gabriel T. Lasek, Aleksander Lemziakov, Sergei Monaco, Gabriele Lo Lutz, Eric Lvov, Dmitrii Maillet, Olivier Mehboudi, Mohammad Mendonça, Taysa M. Miller, Harry J.D. Mitchell, Andrew K. Mitchison, Mark T. Mukherjee, Victor Paternostro, Mauro Pekola, Jukka Perarnau-Llobet, Martí Poschinger, Ulrich Rolandi, Alberto Rosa, Dario Sánchez, Rafael Santos, Alan C. Sarthour, Roberto S. Sela, Eran Solfanelli, Andrea Souza, Alexandre M. Splettstoesser, Janine Tan, Dian Tesser, Ludovico Van Vu, Tan Widera, Artur Halpern, Nicole Yunger Zawadzki, Krissia School of Physics University College Dublin Belfield Dublin 4 Ireland Centre for Quantum Engineering Science and Technology University College Dublin Dublin 4 Ireland School of Physics Engineering and Technology University of York York United Kingdom York Centre for Quantum Technologies University of York York United Kingdom Boltzmanngasse 5 ViennaA-1090 Austria Institute of Physics and Astronomy University of Potsdam Potsdam14476 Germany Department of Physics and Astronomy University of Exeter ExeterEX4 4QL United Kingdom Department of Engineering Science University of Oxford Parks Road OxfordOX1 3PJ United Kingdom Università degli Studi di Palermo Dipartimento di Fisica e Chimica - Emilio Segrè via Archirafi 36 PalermoI-90123 Italy MajuLab CNRS-UCA-SU-NUS-NTU International Joint Research Laboratory France Centre for Quantum Technologies National University of Singapore Singapore117543 Singapore NEST Istituto Nanoscienze-CNR and Scuola Normale Superiore Pisa56127 Italy School of Physics Trinity College Dublin College Green Dublin 2 Ireland Gleb Wataghin Physics Institute The University of Campinas Campinas São Paulo13083-859 Brazil Quantum Systems Unit OIST Graduate University Okinawa Onna904-0495 Japan Department of Physics University of Maryland Baltimore County BaltimoreMD21250 United States Quantum Science Institute University of Maryland Baltimore County BaltimoreMD21250 United States Universidad de La Laguna La Laguna38203 Spain Departamento de Física Universidad de La Laguna La Laguna38203 Spain Jülich54245 Germany Department of Physics Indiana University BloomingtonIN47405 United States Department of Physics Harvard University 17 Oxford Street CambridgeMA02138 United States National Quantum Laboratory College ParkMD20740 United States Department of Physics and Materials Science University of Luxembourg LuxembourgL-1511 Luxembourg Donostia International Physics Center San SebastianE-20018 Spain Au

The last two decades has seen quantum thermodynamics become a well established field of research in its own right. In that time, it has demonstrated a remarkably broad applicability, ranging from providing foundational advances in the understanding of how thermodynamic principles apply at the nano-scale and in the presence of quantum coherence, to providing a guiding framework for the development of efficient quantum devices. Exquisite levels of control have allowed state-of-the-art experimental platforms to explore energetics and thermodynamics at the smallest scales which has in turn helped to drive theoretical advances. This Roadmap provides an overview of the recent developments across many of the field’s sub-disciplines, assessing the key challenges and future prospects, providing a guide for its near term progress. Copyright © 2025, The Authors. All rights reserved.

关键词： Temperature

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PID control with Robust Disturbance Feedback control

PID Control with Robust Disturbance Feedback Control

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Conference on control Applications

作者： Fukiko Kawai Kasper Vinther Palle Andersen Jan D. Bendtsen Section of Automation and Control Department of Electronic Systems Aalborg University 9220 Aalborg Denmark

ISBN: (纸本)9781479977970

Disturbance Feedback control (DFC) is a technique, originally proposed by Fuji Electric, for augmenting existing control systems with an extra feedback for attenuation of disturbances and model errors. In this work, we analyze the robustness and performance of a PID-based control system with DFC. A multiplicative uncertainty model is used to represent mismatch between a nominal model and the actual plant, and expressions for robust stability, nominal and robust performance are derived. We propose a simple grid-based search algorithm that can be used to find DFC gains to achieve robust stability and performance (if such gains exist). Finally, two different simulation case studies are evaluated and compared. Our numerical studies indicate that better performance can be achieved with the proposed method compared with a conservatively tuned PID controller and comparable performance can be achieved when compared with an H-infinity controller.

关键词： DFC technique H-infinity controller

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Active Fault Diagnosis in Sampled-data Systems

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IFAC-PapersOnLine 2015年第21期48卷 883-888页

作者： Niemann, Henrik Poulsen, Niels Kjolstad Department of Electrical Engineering Automation and Control Technical University of Denmark Building 326 DK-2800 Kgs. Lyngby Denmark Dept. of Applied Mathematics and Computer Science Section for Dynamical Systems Technical University of Denmark DK-2800 Kgs. Lyngby Denmark

The focus in this paper is on active fault diagnosis (AFD) in closed-loop sampleddata systems. Applying the same AFD architecture as for continuous-time systems does not directly result in the same set of closed-loop matrix transfer functions. For continuous-time systems, the LFT (linear fractional transformation) structure in the connection between the parametric faults and the matrix transfer function (also known as the fault signature matrix) applied for AFD is not directly preserved for sampled-data system. As a consequence of this, the AFD methods cannot directly be applied for sampled-data systems. Two methods are considered in this paper to handle the fault signature matrix for sampled-data systems such that standard AFD methods can be applied. The first method is based on a discretization of the system such that the LFT structure is preserved resulting in the same LFT structure in the fault signature matrix as obtained for continuous-time systems. The other method is an approximation method, where the same structure is obtained for small parametric faults. © 2015

关键词： Continuous time systems

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Uncertainty Modelling and High Performance Robust controller for Active Front Steering control

Uncertainty Modelling and High Performance Robust Controller...

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Asian control Conference

作者： M. Khairi Aripin R. Ghazali Y. M. Sam Kumeresan Danapalasingam M. Fahezal Ismail Control Instrumentation & Automation Dept. Universiti Teknikal Malaysia Melaka Control & Mechatronics Dept. Universiti Teknologi Malaysia Industrial Automation Section Universiti Kuala Lumpur Malaysia France Institute

ISBN: (纸本)9781479978632

This paper studies the application of sliding mode control (SMC) using the nonlinear sliding surface for yaw rate tracking of active front steering (AFS) control. The nonlinear vehicle model is described to simulate the vehicle plant while the linear uncertain vehicle model with uncertainty of cornering stiffness is established for controller design and analysis. The design of nonlinear sliding surface, AFS control law based SMC and its stability is discussed. The preliminary results of desired yaw rate and uncontrolled vehicle response is presented. It is expected that the propose high performance robust control strategy could improve the yaw rate transient performances in presence of uncertainty.

关键词： Lateral dynamic control Active front steering Nonlinear sliding surface Transient improvement

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Coefficient of Performance Optimization of Single-Effect Lithium-Bromide Absorption Cycle Heat Pumps

Coefficient of Performance Optimization of Single-Effect Lit...

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Conference on control Applications

作者： Kasper Vinther Rene J. Nielsen Kirsten M. Nielsen Palle Andersen Tom S. Pedersen Jan D. Bendtsen Section of Automation and Control Department of Electronic Systems Aalborg University 9220 Aalborg Denmark Added Values 7100 Vejle Denmark

ISBN: (纸本)9781479977970

In this paper, we investigate the coefficient of performance (COP) of a LiBr absorption cycle heat pump under different operating conditions. The investigation is carried out using a dynamical model fitted against data recorded from an actual heat pump used for district heating in S?nderborg, Denmark. Since the model is too complex to study analytically, we vary different input variables within the permissible operating range of the heat pump and evaluate COP at the resulting steady-state operating points. It is found that the best set-point for each individual input is located at an extreme value of the investigated permissible range, and that the COP optimization is likely to be a convex problem. Further, we exploit this observation to propose a simple offline set-point optimization algorithm, which can be used as an automated assistance for the plant operator to optimize steady-state operation of the heat pump, while avoiding crystallization issues.

关键词： recorded actual investigated

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Active fault diagnosis in sampled-data systems 9

Active fault diagnosis in sampled-data systems

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9th IFAC Symposium on Fault Detection, Supervision and Safety for Technical Processes, SAFEPROCESS 2015

作者： Niemann, Henrik Poulsen, Niels Kjølstad Department of Electrical Engineering Automation and Control Technical University of Denmark Building 326 Kgs. LyngbyDK-2800 Denmark Dept. of Applied Mathematics and Computer Science Section for Dynamical Systems Technical University of Denmark Kgs. LyngbyDK-2800 Denmark

关键词： Continuous time systems

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