检索结果-内蒙古大学图书馆

arXiv 2018年

作者： Seo, Gab-Su Colombino, Marcello Subotic, Irina Johnson, Brian Groß, Dominic Dörfler, Florian Power Systems Engineering Center National Renewable Energy Laboratory GoldenCO80401 United States Automatic Control Laboratory ETH Zurich Zurich8092 Switzerland Department of Electrical and Computer Engineering University of Washington SeattleWA98195 United States

—This paper presents an analysis and experimental validation of dispatchable virtual oscillator control (dVOC) for inverter-dominated power systems. dVOC is a promising decentralized control strategy that requires only local measurements to induce grid-forming behavior with programmable droop characteristics. It is dispatchable–i.e., the inverters can vary their power generation via user-defined power set-points and guarantees strong stability. To verify its feasibility, a testbed comprising multiple dVOC-programmed inverters with transmission line impedances is designed. With an embedded synchronization strategy, the dVOC inverters are capable of dynamic synchronization, black start operation, and transient grid voltage regulation with dynamic load sharing, and real-time-programmable droop characteristics for backward compatibility. All these features are experimentally verified. Copyright © 2018, The Authors. All rights reserved.

关键词： Synchronization

来源：评论

学校读者我要写书评

暂无评论

Application-oriented input design for room occupancy estimation algorithms

Application-oriented input design for room occupancy estimat...

引用

IEEE Annual Conference on Decision and control

作者： A. Ebadat D. Varagnolo G. Bottegal B. Wahlberg K. H. Johansson ACCESS and the Department of Automatic Control KTH Royal Institute of Technology Sweden Division of Signals and Systems Lulea University of Technology Sweden TU Eindhoven Department of Electrical Engineering Eindhoven The Netherlands

We consider the problem of occupancy estimation in buildings using available environmental information. In particular, we study the problem of how to collect data that is informative enough for occupancy estimation purposes. We thus propose an application-oriented input design approach for designing the ventilation signal to be used while collecting the system identification datasets. The main goal of the method is to guarantee a certain accuracy in the estimated occupancy levels while minimizing the experimental time and effort. To take into account potential limitations on the actuation signals we moreover formulate the problem as a recursive nonlinear and nonconvex optimization problem, solved then using exhaustive search methods. We finally corroborate the theoretical findings with some numerical examples, which results show that computing ventilation signals using experiment design concepts leads to occupancy estimator performing 4 times better in terms of Mean Square Error (MSE).

关键词： Estimation Ventilation Atmospheric modeling Mathematical model Measurement Numerical models Algorithm design and analysis

来源：评论

学校读者我要写书评

暂无评论

Sparse Identification of Nonlinear Dynamics with Side Information (SINDy-SI)∗

arXiv

引用

arXiv 2023年

作者： Machado, Gabriel F. Jones, Morgan Department of Automatic Control and Systems Engineering The University of Sheffield Amy Johnson Building Mappin Street SheffieldS1 3JD United Kingdom

Modern societies have an abundance of data yet good system models are rare. Unfortunately, many of the current system identification and machine learning techniques fail to generalize outside of the training set, producing models that violate basic physical laws. This work proposes a novel method for the Sparse Identification of Nonlinear Dynamics with Side Information (SINDy-SI). SINDy-SI is an iterative method that uses Sum-of-Squares (SOS) programming to learn optimally fitted models while guaranteeing that the learned model satisfies side information, such as symmetries and physical laws. Guided by the principle of Occam’s razor, that the simplest or most regularized best fitted model is typically the superior choice, during each iteration SINDy-SI prunes the basis functions associated with small coefficients, yielding a sparse dynamical model upon termination. Through several numerical experiments we will show how the combination of side information constraints and sparse polynomial representation cultivates dynamical models that obey known physical laws while displaying impressive generalized performance beyond the training set. Copyright © 2023, The Authors. All rights reserved.

关键词： Dynamics

来源：评论

学校读者我要写书评

暂无评论

Robust Sliding Mode control of a Quadrotor With Disturbance Rejection for Enhanced Stability and Performance

Robust Sliding Mode Control of a Quadrotor With Disturbance ...

引用

International Conference on Robotics and Artificial Intelligence (ICRAI)

作者： Hameed Ullah Owais Zarin Irfan Ahmad Sarfraz Ahmad Ansar Abbas Vincenzo Lippiello Department of Electrical Engineering and Information Technology University of Naples Federico II Naples Italy Department of Electrical Engineering Riphah International University Islamabad Pakistan ACG Department of Automatic Control and Systems Engineering Automatic Control Group School of Bilbao - EIB/BIE University of the Basque Country - UPV/EHU Bilbao Spain Department of Electrical Engineering CEME National University of Sciences and Technology (NUST) Islamabad Pakistan

ISBN: (数字)9798350355703

ISBN: (纸本)9798350355710

This research presents a comprehensive analysis of quadrotor stabilization and trajectory tracking control using Proportional-Integral-Derivative (PID) and Sliding Mode control (SMC) with integrated disturbance rejection. The nonlinear dynamics of the quadrotor are formulated using the Newton-Euler approach, accounting for six degrees of freedom. The PID controller is implemented as a baseline, while the SMC is designed for enhanced robustness to model uncertainties and external perturbations, with a disturbance observer for managing time-varying disturbances. A rigorous Lyapunov stability proof ensures global asymptotic stability of the SMC-controlled system. Extensive simulations evaluate both controllers in terms of tracking accuracy, control effort, and robustness to external disturbances. Results show that SMC outperforms PID in dis-turbance rejection, tracking accuracy, and robustness, making it ideal for UAV applications in complex environments.

关键词： Asymptotic stability Accuracy Uncertainty Trajectory tracking Robustness Stability analysis PD control Sliding mode control Quadrotors Lyapunov methods

来源：评论

学校读者我要写书评

暂无评论

Evolving the very act of reading with socio-collaborative dimensions - Ar-annotations over physical books

UPB Scientific Bulletin, Series C: Electrical Engineering an...

引用

UPB Scientific Bulletin, Series C: Electrical engineering and computer Science 2020年第2期82卷 3-14页

作者： Stănică, Iulia-Cristina Moldoveanu, Alin Alabbasi, Hesham Adnan Moldoveanu, Florica Grădinaru, Alexandru Dascălu, Maria Morar, Anca Asavei, Victor Rădoi, Mireille Faculty of Automatic Control and Computer Science University POLITEHNICA of Bucharest Romania Department of Engineering in Foreign Language University POLITEHNICA of Bucharest Romania Computer Science Department College of Education Mustansiriyah University Iraq Central University Library of Bucharest "Carol I" Romania

Revitalizing reading and modernizing books have become important issues today, when technology is everywhere around us. New means are needed to make reading and physical books attractive to all people, regardless of age, hobbies or occupation. Our current paper presents an innovative project called Lib2Life which creates a mobile application that can improve books by adding annotations and social capabilities to them. © 2020, Politechnica University of Bucharest. All rights reserved.

关键词： Annotation Digital reading Digitization

来源：评论

学校读者我要写书评

暂无评论

Tuning and experimental evaluation of a likelihood-based engine knock controller

Tuning and experimental evaluation of a likelihood-based eng...

引用

52nd IEEE Conference on Decision and control, CDC 2013

作者： Thomasson, Andreas Eriksson, Lars Lindell, Tobias Peyton Jones, James C. Spelina, Jill Frey, Jesse Division of Vehicular Systems Department of Electrical Engineering Linkoping University Linkoping SE-581 83 Sweden Center for Nonlinear Dynamics and Control Department of Electrical and Computer Engineering Villanova University Villanova PA 19085 United States Center for Nonlinear Dynamics and Control Villanova University Villanova PA 19085 United States Science Technology Engineering and Mathematics Division Delaware County Community College Media PA 19063 United States Department of Mathematics and Statistics Villanova University Villanova PA 19085 United States

ISBN: (纸本)9781467357173

A new likelihood-based stochastic knock controller, that achieves a significantly improved regulatory response relative to conventional strategies, while also maintaining a rapid transient response is presented. Up until now it has only been evaluated using simulations and the main contribution here is the implementation and validation of the knock controller on a five cylinder engine with variable compression ratio. Furthermore, an extension of the fast response strategy and a re-tuning of the controller is shown to improve performance. The controller is validated with respect to its robustness to changes in engine operating condition as well as compression ratio. The likelihood-based controller is demonstrated in engine tests and compared to a conventional controller and it is shown that it is able to operate closer to the knock limit with less variations in control action without increasing the risk of engine damage. © 2013 IEEE.

关键词： controllers

来源：评论

学校读者我要写书评

暂无评论

A DES approach to control of hybrid dynamical systems 5th

A DES approach to control of hybrid dynamical systems

引用

5th DIMACS/SYCON Workshop on Verification and control of Hybrid systems, 1995

作者： Raisch, Jörg O’Young, Siu Institut für Systemdynamik und Regelungstechnik Universität Stuttgart Pfaffenwaldring 9 StuttgartD-70550 Germany Systems Control Group Department of Electrical and Computer Engineering University of Toronto TorontoONM5S 1A4 Canada

ISBN: (纸本)354061155X

We consider a special discrete-time hybrid problem: the plant state "lives" in IRn and is affected by real-valued norm-bounded disturbances;the control input and measurement signals are sequences of symbols. The control problem is to find a feedback strategy which maps the sequence of measurement symbols into an appropriate sequence of plant input symbols. It is converted into, and solved as, a supervisory control problem for discrete-event systems (DES). © Springer-Verlag Berlin Heidelberg 1996.

关键词： Discrete event simulation

来源：评论

学校读者我要写书评

暂无评论

Towards quantitative comparison of computer number systems

Towards quantitative comparison of computer number systems

引用

computer Arithmetic (ARITH)

作者： S. Ong D. E. Atkins Systems Engineering Laboratory Department of Electrical and Computer Engineering University of Michigan Ann Arbor MI USA Program in Computer Information and Control Engineering University of Michigan Ann Arbor MI USA

This paper describes an evolving Arithmetic Design System (ADS) to support the quantitative evaluation of alternate number systems with respect to a given application and realization technology. In computer arithmetic we are concerned with establishing a correspondence between abstract quantities (numbers) and some physical representation (symbols), and with simulating the operations on these symbols. The ADS is intended to help study the cost and performance of alternate simulations. A finite number system is a triple consisting of a symbol set (elements are called "digit-vectors"), an interpretation set, a mapping between these two sets, and a set of operators (digit-vector algorithms) defined on its symbol set. A set of these digit vector algorithms are proposed for conducting arithmetic design. A number system matrix defines the digit vector algorithm for numerous number systems and a method for computing time and space complexity of compositions of these algorithms is proposed. An example of how the system could be used to compare addition, with and without overflow detection, for three number systems is given.

关键词： Vectors Complexity theory computers Algorithm design and analysis Finite element methods Hardware Digital arithmetic

来源：评论

学校读者我要写书评

暂无评论

Look-ahead control of road vehicles for safety and economy purposes

Look-ahead control of road vehicles for safety and economy p...

引用

European control Conference (ECC)

作者： András Mihály Balázs Németh Péter Gáspár Department of Control for Transportation and Vehicle Systems Budapest University of Technology and Economics Budapest Hungary Systems and Control Laboratory Hungarian Academy of Sciences Budapest Hungary Institute for Computer Science and Control MTA-BME Control Engineering Research Group Hungary

ISBN: (纸本)9781479947287

The paper proposes a look-ahead cruise control method considering both energy efficiency and the safety of vehicle motion. Based on the curve radius of the road, a method is proposed for the calculation of the safe cornering velocity, which is used in the look-ahead control design process. If the speed limit is in conflict with the calculated safe cornering velocity, the latter is applied in the energy optimization process of the look-ahead control algorithm. Thus, the designed velocity is coherent with the terrain characteristics, the speed limits and the geometry of the road as well, enabling the vehicle to travel safely and energy efficiently along the path. The main novelty of the paper is the consideration of the safe cornering velocity in the look-ahead design, improving energy efficiency and the safety of the vehicle during various maneuvers.

关键词： Vehicles Roads Friction Energy efficiency Force Safety Optimization

来源：评论

学校读者我要写书评

暂无评论

Comparison of three approaches to atmospheric source localization

Comparison of three approaches to atmospheric source localiz...

引用

作者： Abdelghaffar, Hossam M. Woolsey, Craig A. Rakha, Hesham A. Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University BlacksburgVA24060 United States Department of Computers and Control Systems Faculty of Engineering Mansoura University 60 El Gomhoria Street Mansoura Dakahlia35516 Egypt Department of Aerospace and Ocean Engineering Virginia Polytechnic Institute and State University BlacksburgVA24060 United States Department of Civil and Environmental Engineering Virginia Polytechnic Institute and State University BlacksburgVA24060 United States

The paper describes three methods for finding the source of an airborne contaminant in a turbulent wind field. Weassume that an unmanned aircraft samples the atmosphere at a constant altitudewithin the planetary boundary layer, measuring the contaminant concentration. The turbulent wind field is generated using the openly available software TurbSim. A concentration field, or plume, is created by advection and diffusion of the contaminant from its source. The plume is modeled using a filament-based method proposed in the literature. The unmanned aircraft is assumed to sample the concentration field quickly, relative to the plume dynamics;once the plume has matured, the concentration is fixed and the sampling strategy is executed. A recursive Bayesian estimation approach is compared with a gradient descent algorithm and an extended Kalman filter. By comparison, Bayesian estimation requires relatively weak modeling assumptions, and simulation results suggest this approach is less sensitive to error in the initial state. Copyright © 2016 by the American Institute of Aeronautics and Astronautics, Inc.

关键词： Boundary layers

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：