检索结果-内蒙古大学图书馆

Conference on control and Fault-Tolerant Systems

作者： Mogens Blanke Soren Hansen Automation and Control Group at Dept. of Electrical Engineering Technical University of Denmark

ISBN: (纸本)9781479928569

control surface fault diagnosis is essential for timely detection of manoeuvring and stability risks for an unmanned aircraft. Timely detection is crucial since control surface related faults impact stability of flight and safety. Reliable diagnosis require well fitting dynamical models but with the high cost of detailed modelling and wind tunnel testing, it would be highly desirable if good diagnosis could be obtained with very generic models that are adapted to individual conditions of aircraft and of its operation. This paper presents an approach where a basic generic model is applied and necessary parameters in residual generators are identified on the fly. Initial estimates of parameters are known from off-line analysis of previous flights. The paper analyses how such self-tuning residual generators are combined with change detection to obtain timely fault diagnosis. The paper investigates the parameter convergence and detection properties for the suggested combination of identification and change detection techniques and shows design aspects and trade-offs to be made to make this scheme an effective and robust system for diagnosis or even prognosis. Results are verified using a number of test flights with different members of a population of UAVs that have inherent model uncertainty from one member to another and from one flight to another. Events with actual faults on control surfaces demonstrates the efficacy of the approach.

关键词： control surfaces Unmanned Aerial Vehicle Fault diagnosis drone honey bees model uncertainty dynamos Test flights TUNNEL TEST Maneuvering inspection technique flight RESIDUAL analysis of flowline

来源：评论

学校读者我要写书评

暂无评论

Development of predictive hybrid redundancy for fault tolerant in safety critical systems

Development of predictive hybrid redundancy for fault tolera...

引用

4th IEEE International Conference on Mechatronics, ICM 2007

作者： Son, Byong Jum Park, Ji Hoon Kyung, Nam Ha Lee, Suk Kyung, Chang Lee Kim, Man Ho School of Mechanical Engineering Pusan National University 609-735 Busan Korea Republic of Dept. of Control and Automation Engineering Pukyong National University 608-739 Busan Korea Republic of Dept. of Mechatronics Intelligent Vehicle Research Team DGIST 704-230 Daegu Korea Republic of

ISBN: (纸本)142441184X

As many systems depend on electronics, concern for fault tolerance is growing rapidly. For example, a car with its steering controlled by electronics and no mechanical linkage from steering wheel to front tires (steer-by-wire) should be fault tolerant because a failure can come without any warning and its effect is devastating. In order to make system fault tolerant, there has been a body of research mainly from aerospace field. This paper presents the structure of predictive hybrid redundancy that can filter out most erroneous values. In addition, several numerical simulation results are given where the predictive hybrid redundancy outperforms well-known average and median voters. ©2007 IEEE.

关键词： Fault tolerance

来源：评论

学校读者我要写书评

暂无评论

Stabiliser fault emergency control using reconfiguration to preserve power system stability 19

Stabiliser fault emergency control using reconfiguration to ...

引用

19th IFAC World Congress on International Federation of Automatic control, IFAC 2014

作者： Pedersen, Andreas S. Richter, Jan H. Tabatabaeipour, Mojtaba Jóhannsson, Hjörtur Blanke, Mogens Automation and Control Group Dept. of Electrical Engineering Denmark Centre for Electric Power and Energy Dept. of Electrical Engineering Denmark Technical University of Denmark Lyngby2800 Kgs. Denmark Siemens AG Industry Sector Gleiwitzer Str. 555 Nürnberg90475 Germany

ISBN: (纸本)9783902823625

Stabiliser faults in multi-machine power systems are examined in this paper where fault-masking and system reconfiguration of the nonlinear system are obtained using a virtual actuator approach. Phasor Measurement Units, which can be integrated in wide-area transmission grids to improve the performance of power system stabilisers, are utilised when reconfiguring remaining stabilisers after a local failure has made one inoperable. A stability-preserving reconfiguration is designed using absolute stability results for Lure type systems. The calculation of a virtual actuator that relies on the solution of a linear matrix inequality (LMI) is detailed in the paper. Simulation results of a benchmark transmission system show the ability of the fault-tolerant reconfiguration strategy to maintain wide-area stability of a power system despite failure in one of the stabilisers. © IFAC.

关键词： Electric power transmission

来源：评论

学校读者我要写书评

暂无评论

Design, implementation and control of dual axis self balancing inverted pendulum using reaction wheels 10

Design, implementation and control of dual axis self balanci...

引用

10th International Conference on Electrical and Electronics engineering, ELECO 2017

作者： Türkmen, Abdullah Korkut, M. Yusuf Erdem, Mustafa Gönül, Ömer Sezer, Volkan Mechatronics Graduate Program Istanbul Technical University Istanbul Turkey Energy Institute Istanbul Technical University Istanbul Turkey Dept. of Control and Automation Engineering Istanbul Technical University Istanbul Turkey

ISBN: (纸本)9786050107371

Inverted pendulum systems have an important place in practice for control problems due to their nonlinear structures. It is a very difficult task to control the orientation and speed of objects and robots which are free in three dimensions. These systems constitute the substructure of many advanced systems. Conventional actuators may not be used in such applications due to various limitations. Under these circumstances usage of reaction wheels come into prominence. Reaction wheel based systems are used for orienting, coordinating and balancing of spacecraft, transport systems, and other such systems. In this study, dual axis self-balancing reaction wheel based inverted pendulum system which is a basis for many complex systems has been designed, manufactured and controlled. © 2017 EMO (Turkish Chamber of Electrical Enginners).

关键词： Inverted pendulum

来源：评论

学校读者我要写书评

暂无评论

Application of an H ∞ Based FDI and control Scheme for the Three Tank System

引用

IFAC Proceedings Volumes 2000年第11期33卷 273-278页

作者： Jakob Stoustrup Henrik Niemann Dept. of Control Engineering Aalborg University DK-9220 Aalborg Denmark Dept. of Automation Technical University of Denmark DK-2800 Lyngby Denmark

The three tank benchmark system is considered in this paper in connection with combined feedback control and fault detection and identification (FDI). The combined design problem is formulated as an H ∞ design proble... 详细信息

关键词： Fault identification H-infinity optimization benchmark examples feedback control

来源：评论

学校读者我要写书评

暂无评论

Discrete Time LQG/LTR Applied To A Practical Quadruple Tank System

Discrete Time LQG/LTR Applied To A Practical Quadruple Tank ...

引用

IEEE Multi-Conference on Systems and control

作者： Gabriel P. das Neves Fernando S. Barbosa Plinio S. Costa Bruno A. Angelico Laboratory of Automation and Control Dept. Telecommunications and Control Engineering Polytechnic School of the University of Sao Paulo

ISBN: (纸本)9781509007561

Discrete time robust linear quadratic Gaussian controller with loop transfer recovery (LQG/LTR) considering the augmented system with the addition of backward Euler integrator at controller output is applied to a practical quadruple tank system. The plant developed in this work is a benchmark of a multivariable two-input-two-output (TITO) system with coupled channels, frequently used in academic works, mainly due to its versatility for generating minimum phase or non-minimum phase systems and to the coupled channels characteristic. For the LQG/LTR controller, the singular values of the open loop transfer function are matched in the frequency range from zero up to the Nyquist rate using the same approach considered for continuous time system design. Simulation and practical experiments are performed in order to validate the controller design considering set-point tracking and disturbance rejection. It is possible to observe that the resulting controller performs very well tracking step and sinusoidal inputs and rejecting sinusoidal disturbances. Practical and simulated results are very similar to each other.

关键词： Nyquist rate non-minimum phase system controller output discrete-time Quadruple sinusoidal input frequency ranges Disturbance rejection Tanks controller design BENCHMARKS Continuous time systems loop transfer recovery

来源：评论

学校读者我要写书评

暂无评论

Decoupling autopilot MIMO controller design

Decoupling autopilot MIMO controller design

引用

31st IASTED International Conference on Modelling, Identification, and control, MIC 2011

作者： Bányász, Csilla Keviczky, László Dept. of Automation and Informatics Control Engineering Research Group of the H. Ac. of Sc. Computer and Automation Research Institute of the H. Ac. of Sc. Kende u 13-17 H-1111 Budapest Hungary

ISBN: (纸本)9780889868632

The principal lateral motion of an aircraft is described by a minimum of fourth order coupled state variable model. It is interesting to investigate how a decoupling controller can be designed. The Youla-parametrization is a simple method to design controllers. The KB-parametrization is a successful extension of this method for two-degree-of freedom (2DOF) systems. The paper extends this methodology for multivariable case and applies to the decoupling lateral control.

关键词： controllers

来源：评论

学校读者我要写书评

暂无评论

A rule - Base modification for time delay systems

A rule - Base modification for time delay systems

引用

10th IASTED International Conference on Artificial Intelligence and Soft Computing, ASC 2006

作者： Genç, Hakký Murat Eksin, Ybrahim Güzelkaya, Müjde Yesil, Engin Marmara Research Center Information Technologies Institute 41470 Gebze Kocaeli Turkey Technical University of Ýstanbul Electrical and Electronics Faculty Control and Automation Engineering Dept. 80626 Maslak Ýstanbul Turkey

ISBN: (纸本)0889866104

In time delay control systems, the observed information is related to a past instant and using this delayed signal may cause unsatisfactory results in control system applications. This paper deals with how time delay information can be used in reorganizing the rule base so as to improve system performance. Basically, it proposes a new scheme of appropriate shifting of the rule base to compensate the information lag caused by time delay in the system. The parameters affecting the shifting scheme are discussed in detail and the shifting scheme is tabulated with respect to system model parameters. Applications of the new methodology in different systems are simulated and the effectiveness of the scheme is fully illustrated.

关键词： Time delay

来源：评论

学校读者我要写书评

暂无评论

Multispectral thermometry based on neural network

引用

Journal of Harbin Institute of Technology(New Series) 2003年第1期10卷 108-112页

作者：孙晓刚戴景民 Post doctor Station of Electrical Engineering Harbin Science and Technology University Dept. of Automation Measurement & Control Harbin Institute of Technology Harbin 150001 China Dept. of Automation Measurement & Control Harbin Institute of Technology

In order to overcome the effect of the assumption between emissivity and wavelength on the measurement of true temperature and spectral emissivity for most engineering materials, a neural network based method is proposed for data processing while a blackbody furnace and three optical filters with known spectral transmittance curves were used to make up a true target. The experimental results show that the calculated temperatures are in good agreement with the temperature of the blackbody furnace, and the calculated spectral emissivity curves are in good agreement with the spectral transmittance curves of the filters. The method proposed has been proved to be an effective method for solving the problem of true temperature and emissivity measurement, and it can overcome the effect of the assumption between emissivity and wavelength on the measurement of true temperature and spectral emissivity for most engineering materials.

关键词： multispectal thermometry emissivity neural networK

来源：评论

学校读者我要写书评

暂无评论

Improved Process Diagnosis Using Fault Contribution Plots from Sparse Autoencoders

引用

IFAC-PapersOnLine 2020年第2期53卷 730-737页

作者： Ásgeir Daniel Hallgrímsson Hans Henrik Niemann Morten Lind Automation and Control Group Dept. of Electrical Engineering Technical University of Denmark Kgs. Lyngby 2800 Denmark

Development of model-based fault diagnosis methods is a challenge when industrial systems are large and exhibit complex process behavior. Latent projection (LP), a statistical method that extract features of data via dimensionality reduction, is an alternative approach to diagnosis as it can be formulated to not rely on process knowledge. However, LP methods may perform poorly at identifying abnormal process variables due a “fault smearing” effect -variables unaffected by a fault are unintentionally characterized as being abnormal. The effect occurs because data compression permits faulty and non-faulty variables to interact. This paper presents an autoencoder (AE), a nonlinear LP method based on neural networks, as a monitoring method of a simulated nonlinear triple tank process (TTP). Simulated process data was used to train the AE to generate a monitoring statistic representing the condition of the TTP. Sparsity was introduced in the AE to reduce variable interactivity. The AE’s ability to detect a fault was demonstrated. The individual contributions of process variables to the AE’s monitoring statistic were analyzed to reveal the process variables that were no longer consistent with normal operating conditions. The key result in this study was that sparsity reduced fault smearing onto unaffected variables and increased the contributions of actual faulty variables.

关键词： Fault detection isolation machine learning grey box modelling learning for control subspace methods

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：