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检索条件"主题词=Computer algorithms"

共 3464 条记录，以下是3341-3350 订阅

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GLARE: A Tool for Product-Oriented Design of Combinatorial Libraries

GLARE: A Tool for Product-Oriented Design of Combinatorial L...

引用

作者： Jean-François Truchon

Combinatorial chemistry with two or more diversity points often leads to an immense number of theoretical products. It is sensible to select the reagents based on the desired properties of the products in the hope of maximizing the usefulness of the synthesized molecules. The presented tool enables the filtering of reagents such that any further reagent selection will form products matching the desired properties. Virtual combinatorial library leading to thousands of billions of products can be rapidly assessed. The publicly available software (http://*** ) and key algorithmic elements are discussed. less

关键词： Combinatorial library design computer algorithms product properties multi-objective optimization

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Robustified Distributed Model Predictive Control for Coherence and Energy Efficiency-Aware Platooning

Robustified Distributed Model Predictive Control for Coheren...

引用

American Control Conference

作者： Massimo Zambelli Antonella Ferrara University of Pavia via Ferrata 5 Pavia 27100 Italy

ISBN: (纸本)9781538679012;9781538679265

Platooning has become one of the most appealing formations for intelligent vehicles safety enhancement and traffic regulation. Besides the traditional control algorithms, which are required to enforce at least local and string stability, more complex control schemes can be designed to cope with advanced requirements. In this paper, a suitable Distributed Model Predictive Control (DMPC) scheme, robustified with a second -order Integral Sliding Mode (ISM) correction term, is proposed to enforce and maintain coherence during cruising, while considering energy efficiency during acceleration/deceleration phases. While the former aspect has a complex impact on traffic regulation, especially when a large number of vehicles is considered, the latter is of primary importance in an increasingly eco-friendly transportation systems design. The proposed approach is well suited for real-world implementation, and can constitute a valid basis for more advanced control architectures. Simulation results highlight the effectiveness of the proposed architecture in maintaining the formation while guaranteeing a robust achievement of the required performance.

关键词： Traffic law Car following coherence enforcement Energy efficiency Cruises computer algorithms Large automobiles

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Boundary tracking using a suboptimal sliding mode algorithm

Boundary tracking using a suboptimal sliding mode algorithm

引用

IEEE Annual Conference on Decision and Control

作者： Prathyush P. Menon Christopher Edwards Yuri B. Shtessel Debasish Ghose Jim Haywood College of Engineering Mathematics and Physical Sciences University of Exeter Exeter EX4 4QF UK Department of Electrical Engineering University of Alabama Huntsville USA Department of Aerospace Engineering Indian Institute of Science Bangalore India University of Exeter and MetOffice

ISBN: (纸本)9781467360890

In this paper, a sliding mode control algorithm is proposed that allows a single, sensor enabled agent to navigate along the boundary of a contaminated region. The proposed control algorithm only requires knowledge of the local measurement of the scalar field. No gradient information is required for the spatial phenomenon and this distinguishes this work from much of the existing literature. The efficacy of the proposed approach is demonstrated using synthetic volcanic eruption dispersion data made available from a complex Lagrangian model.

关键词： computer algorithms Sliding mode Boundary Volcanic Eruptions Agents site measurements tracking Variable structure systems

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Robust and Adaptive Wastegate Control of Turbocharged Internal Combustion Engines

Robust and Adaptive Wastegate Control of Turbocharged Intern...

引用

American Control Conference

作者： Sergey Samokhin Kai Zenger Department of Electrical Engineering and Automation School of Electrical Engineering Aalto University Otaniementie 17 02150 Espoo Finland

ISBN: (纸本)9781479932757

This work deals with advanced control methods for marine turbocharged internal combustion diesel engines (ICDE) equipped with a wastegate. Two fundamentally different approaches are proposed for a wastegate control - robust multivariable mixed-sensitivity and indirect output-based adaptive control. Robust multivariable controller design is rather common approach for internal combustion engines control that can be found from many papers, whilst indirect adaptive control is still novel in this area. This paper aims to determine the benefits and drawbacks of these control algorithms in their application for a wastegate control. A nonlinear model of diesel engine is derived and linearized for a control design. Both algorithms are then described, modeled and applied to this model.

关键词： gasoline engine combustion engine Turbochargers adaptive control computer algorithms design control Diesel engines Control Methods Robustness Nonlinear Models controller design Multivariable Standing Orders

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Multi-Robot 3D Coverage of Unknown Terrains

Multi-Robot 3D Coverage of Unknown Terrains

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IEEE Conference on Decision and Control

作者： Alessandro Renzaglia Lefteris Doitsidis Agostino Martinelli Elias B. Kosmatopoulos INRIA Rhone-Alpes Grenoble France Department of Electronics Technological Educational Institute of Crete Chania Greece & Informatics & Telematics Institute CERTH Thessaloniki Greece Department of ECE Democritus University of Thrace Xanthi Greece & Informatics & Telematics Institute CERTH Thessaloniki Greece

ISBN: (纸本)9781612848006

In this paper we study the problem of deploying a team of flying robots to perform surveillance coverage missions over an unknown terrain of arbitrary morphology. In such a mission, the robots should simultaneously accomplish two objectives: firstly, to make sure that the overall terrain is visible by the team and, secondly, that the distance between each point in the terrain and one of the robots is as small as possible. These two objectives should be efficiently fulfilled given the physical constraints and limitations imposed at the particular coverage application (i.e., obstacle avoidance, limited sensor capabilities, etc). As the terrain's morphology is unknown and it can be quite complex and non-convex, standard multi-robot coordination and control algorithms are not applicable to the particular problem treated in this paper. In order to overcome such a problem, a new approach that is based on the Cognitive-based Adaptive Optimization (CAO) algorithm is proposed and evaluated in this paper. Both rigorous mathematical arguments and extensive simulations on unknown terrains establish that the proposed approach provides an efficient methodology that can easily incorporate any particular constraints and quickly and safely navigate the robots to an arrangement that optimizes surveillance coverage.

关键词： terrains Robot aerospace robotics Coverage landscapes Unknown Obstacle avoidance computer algorithms Dosage Form Not Applicable

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Towards Coordinated Congestion Control and Load Balancing in Datacenter Networks

Towards Coordinated Congestion Control and Load Balancing in...

引用

IEEE Global Communications Conference

作者： Zhengwei Zhao Zhixiong Jiang Chunyang Lu Yushan Cai Jingping Bi Institute of Computing Technology Chinese Academy of Sciences Information Technology Center China National Petroleum Corporation

ISBN: (纸本)9781479913510

Today's data centers are facing extreme challenges in providing low latency and high throughput simultaneously for their applications. However, the fair sharing congestion control algorithms, together with the hash-based load balancing mechanisms, seriously impede the satisfaction of such requirements. In this paper, we use threshold-based signaling and marking schemes to seamlessly integrate load balancing with congestion control protocols. Through adaptive per-packet load balancing, we evenly split network traffic across multiple paths. Meanwhile, we adaptively react to ECN in the case of congestion, and prioritize flows according to their latency requirements. Using realistic data center workloads, we show that, compared to the state-of-the-art load balancing and TCP, our approach improves the application throughput and mean flow completion time by 30-50% and 40-80%, respectively.

关键词： Load balancing data center control protocol ECN (3beta,5alpha,17beta)-17-hydroxyestrane-3-carbonitrile computer algorithms Workload traffic network Tritolyl Phosphates tactical command post Packet

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Predictive Control of Converter Switches in a Multi-Terminal HVDC system

Predictive Control of Converter Switches in a Multi-Terminal...

引用

Annual Conference of the IEEE Industrial Electronics Society

作者： Mohsen Vatani Morten Hovd Department of Engineering Cybernetics Norwegian University of Science and Technology

ISBN: (纸本)9781479902255

In this paper, the Finite Control Set Model Predictive Control (FSC-MPC) is used to control the multi-level neutral point clamped converter of each station in a four-terminal VSC-based Multi-Terminal HVDC system (MTDC). Three stations of MTDC are controlled to track desired reference power and one station is controlled to keep the DC side voltage in the desired value. The FCS-MPC controller is designed to keep a tradeoff between current tracking error, switching frequency and capacitor voltage balancing. The measurement and computation delay is considered by applying two steps ahead prediction in control algorithm. The validity of the proposed controller is confirmed by simulations.

关键词： Multi-terminal HVDC Finite Control Set MPC Neutral point clamped converters Optimization HVDC SYSTEMS Predictive control multiterminal Converters STATIONS computer algorithms tradeoffs DC side Switches

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Self-Organizing Neural Adaptive Tracking Control of High Speed Trains Subject to Unexpected Traction-Breaking Failures

Self-Organizing Neural Adaptive Tracking Control of High Spe...

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International Joint Conference on Neural Networks

作者： Rui-Zhen Gao Yu-Juan Wang Jun-Feng Lai Yong-duan Song School of Automation Chongqing University

ISBN: (纸本)9781509006212

This paper develops an adaptive control scheme for position and velocity tracking control of high speed trains under uncertain system nonlinearities and actuator failures. Neural networks with self-organizing capabilities are integrated into control design, where the number of the neurons can be adjusted online automatically, so as not only to avoid the problem inherent in the NN with fixed structure but also to deal with system uncertainties containing of nonlinear in-train forces, traction-braking nonlinearities, as well as the unknown actuation faults. As such, the resultant control algorithms are able to achieve high precision train speed and position tracking under varying operation railway conditions, as validated by theoretical analysis and numerical simulations.

关键词： high-speed train nonlinearity system uncertainties Location tracking Adaptive tracking computer algorithms design control adaptive control Theoretical analysis Fixed platforms

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A Vector Control of a Grid-Connected 3L-NPC-VSC with DFIG Drives

A Vector Control of a Grid-Connected 3L-NPC-VSC with DFIG Dr...

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Electronics, computer, Telecommunications and Information Technology International Conference on Electrical Engineering/Electronics, computer, Telecommunications and Information Technology

作者： W. Srirattanawichaikul Y. Kumsuwan S. Premrudeepreechacharn B. Wu Department of Electrical Engineering Faculty of Engineering Chiang Mai University Department of Electrical and Computer Engineering Rajamangala University of Technology Lanna Department of Electrical Engineering Faculty of EngineeringChiang Mai University Department of Electrical and Computer Engineering Ryerson University

ISBN: (纸本)9781424456062

This paper presents a vector control of grid-connected three-level neutral point clamped voltage source converter (3L-NPC-VSC) connecting doubly-fed induction generator (DFIG) drives for variable-speed wind power generation. The control algorithm of the grid-connected 3L-NPC-VSC applies the concepts of the decoupled vector control method, which provides independent control active and reactive power flow and maintain the dc-link voltage constant. The simulation results are shown dynamic and steady-state performance of the grid-connected 3L-NPC-VSC in mode sub-synchronous and super-synchronous speed at low switching frequency that compared with a conventional two-level voltage source converter (2L-VSC). The control strategy is verified by the simulation results with a good sinusoidal current, a low harmonic component and a fast dynamic response.

关键词： Power flow computer algorithms Variable speed voltage source converter Automobile driving Dynamic response Pest Control Vector control DRIVES control strategy Control Methods Simulation results

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An Automatic Parachute Separation System for Aerial Dispersal Miniature Reconnaissance Robot

An Automatic Parachute Separation System for Aerial Dispersa...

引用

Chinese Control and Decision Conference

作者： Yao Chen Xuanyang Shi Intelligent Robotics Institute Key Laboratory of Biomimetic Robots and Systems Ministry of Education School of Mechatronical Engineering Beijing Institute of Technology

ISBN: (纸本)9781467397155

The kernel of the system is an intelligent control algorithm which can recognize precisely the whole dropping-process from launch module starting up to the miniature robots touching down and then determine whether the robot lands finally. The controller will activate a motor to realize the separation of parachute from the landed robot. This article, based on research into the principle of the system, proposes a control algorithm utilizing a 3-axis digital accelerometer. At last, the related experiments shows that the approach is effectual.

关键词： Intelligent control algorithm Recognize dropping-process Separation of parachute 3-axis digital accelerometer computer algorithms Miniature Robot ANTENNA Seed Dispersal dispersal (organisms) Motor separation AUTOMATIC Intelligent control

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