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Structural Modeling and Fuzzy-Logic Based Diagnosis of a Ship Propulsion Benchmark

IFAC Proceedings Volumes 2000年第21期33卷 367-372页

作者： Roozbeh Izadi-Zamanabadi Mogens Blanke Seraj Katebi Dept. of Control Engineering Aalborg University DK-9220 Aalborg Denmark Dept. of Automation Technical University of Denmark DK-2800 Lyngby Denmark Dept. of Computer Science and Engineering School of Engineering Shiraz University Shiraz Iran

An analysis of structural model of a ship propulsion benchmark leads to identifying the subsystems with inherent redundant information. For a nonlinear part of the system, a Fuzzy logic based FD algorithm with adaptiv... 详细信息

关键词： Structural analysis Fuzzy logic Fuzzy observer fault detection adaptive threshold Ship benchmark

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Nonlinear system identification and control design using adaptive wavelet network 6

Nonlinear system identification and control design using ada...

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6th IFAC Symposium on Nonlinear Control Systems, NOLCOS 2004

作者： Karimi, H.R. Lohmann, B. Moshiri, B. Jabchdar Maralani, P. Control and Intelligent Processing Center of Excellence Dept. of Electrical and Computer Engineering Faculty of Engineering University of Tehran Tehran Iran Institute of Automation University of Bremen Otto-Hahn-Allee NW1 BremenD-28359 Germany

This paper presents an application of wavelet networks in identification and control design tor a class of non-linear dynamical systems. The technique of feedback linearization, supervisory control and H∞ control are used to design an adaptive control law and also the parameters of the wavelet networks arc adapted using a Lyapunov-based design. By some theorems, it will be proved that even in the presence of modelling errors, named network error, the stability of the overall identification scheme and the convergence of the network parameters and the boundedness of the state errors are guaranteed. Copyright © 2004 IFAC.

关键词： Feedback linearization

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Reliability Analysis and Performance Degradation of a Boost Converter

Reliability Analysis and Performance Degradation of a Boost ...

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IEEE Energy Conversion Congress and Exposition

作者： Mohammed Khorshed Alam Faisal H. Khan Power Engineering and Automation Research Lab (PEARL) Dept. of Electrical and Computer Engineering University of Utah

ISBN: (纸本)9781479903375

In general, power converters are being operated in closed-loop systems, and any characteristic variations in one component will simultaneously alter the operating point of other components resulting in a shift in overall reliability profile. This interdependence makes the reliability of a converter a complex function of time and operating conditions;and therefore, the application may demand periodic replacement of converters to avoid downtime and maintenance cost. By knowing the present state of health and remaining life of a power converter, it is possible to reduce the maintenance cost for expensive high-power converters. This paper presents a reliability analysis for a boost converter although this method could be used to any power converter being operated in closed-loops. Through the conducted study it is revealed that the reliability of a boost converter with control loops degrades with time, and this paper presents a method to calculate time varying reliability of a boost converter as function of characteristic variations in different components in the circuit. In addition, the effects of operating and ambient conditions have been included in the reliability model as well. It was found that any increase in the ON-resistance of the MOSFET or equivalent series resistance (ESR) of the output capacitor decreases the overall reliability of the converter. However, any variation in the capacitance has more complex impact on the converter's reliability. This conducted research is a step forward to the power converter reliability analysis because the cumulative effect of multiple degraded components has been considered in the reliability model.

关键词： boost converters Converters Reliability analysis reliability model power conversion unit degradation of performance Health Status output capacitor CLOSED LOOP TIME FUNCTIONS Maintenance costs

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Robotic applications in the automation of agricultural production under greenhouse: A review 3

Robotic applications in the automation of agricultural produ...

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3rd IEEE Colombian Conference on Automatic Control, CCAC 2017

作者： Tangarife, Hector Ivan Diaz, Andres Escobar CMM Investigation Group GICEMET SENA Dept. Electronic. Spe. Computer Science and Automation District University FJC Bogotá Colombia Investigation Group ORCA Dept. Control Engineering and Telecommunications District University Francisco José de Caldas Bogotá Colombia

ISBN: (纸本)9781538603987

This article shows a review of the state of the art in the agricultural automation under greenhouse through the use of robotics platforms as a source of solution to different problems that arise in the agricultural sector specially under controlled conditions;the writing is part of a wide review of the agricultural automation under greenhouse and a set of proposals that consider applications in various fields of research, autonomous localized irrigation, neural networks, automatic learning, monitoring and control systems among others. It is intended to determine the most recent advances in techniques for sowing, applications of chemical for sanitary control, fertilization, harvest, where robotics is used as a source to solve agricultural problems. The review includes consultation in well-known national and international journals, research carried out in centers and research groups or companies dedicated to implementation addressed to the agricultural sector, finally it is determined the solutions that can be implemented to propose new topics, research lines, development and technology transfer to the agricultural sector. © 2017 IEEE.

关键词： Greenhouses

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GPU based small target detection using IR images

GPU based small target detection using IR images

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2012 9th International Bhurban Conference on Applied Sciences and Technology, IBCAST 2012

作者： Javed, Muhammad Ahmad Xu, Guili Yao, Jie Li, Ning Shah, Syed Yaqub College of Electronic and Information Engineering Nanjing Univ. of Aeronautics and Astronautics 210016 Nanjing China College of Automation Engineering Nanjing Univ. of Aeronautics and Astronautics 210016 Nanjing China Dept. of Computer System Engineering NWFP Univ. of Engineering and Technology Peshawar Pakistan

ISBN: (纸本)9781457719295

In this paper we present a new method for detecting moving object in infrared image sequences which contain nuisance objects and noise. The moving target detection approach is based on wavelet transform with GPU implementation. According to the features of the modulus maxima images after wavelet transform, the background clutter and noise are eliminated. The effectiveness of this new method is demonstrated by applying the resulting algorithm to infrared images containing moving targets. © 2012 IEEE.

关键词： Wavelet transforms

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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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Modeling and analyzing nano-rod pushing with an AFM

Modeling and analyzing nano-rod pushing with an AFM

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2010 10th IEEE Conference on Nanotechnology, NANO 2010

作者： Hou, Jing Wu, Chengdong Liu, Lianqing Wang, Zhidong Dong, Zaili Dept. of Electrical and Computer Engineering Northeastern University Shenyang 110004 China State Key Laboratory of Robotics Shenyang Institute of Automation CAS Shenyang 110016 China Dept. of Advanced Robotics Chiba Institute of Technology Chiba Japan School of Information and Control Engineering Shenyang Jianzhu University Shenyang 110168 China

ISBN: (纸本)9781424470334

In developing nano-devices and nano-structures, traditional methodologies on MEMS meet the difficulty from the scale restriction. With the strategy of objects assembly, using AFM to handle nano-rods and other nano-objects is considered as an important and high potential technology in constructing nanostructures. However most of AFM only has one tip as the end effector and cannot control both translational and rotational motions during manipulation, this makes it be difficult to realize posture controllable manipulation especially in nano environment. In this paper, the behavior of nano-rod under pushing is theoretically analyzed and modeled. Viscous friction is incorporated in the model and the two situations that the pivot of the nanorod is either inside or outside the rod are addressed. By modeling, the pivot can be determined at each manipulation in real time, and the pushing points can be planned to realize posture controllable manipulation by using nano-hand strategy which is inspired by stable pushing theory of object manipulation in macro world, and to improve the reliability and the precision of manipulation. ©2010 IEEE.

关键词： Nanorods

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A neural network based approach to adaptive fault tolerant flight control

A neural network based approach to adaptive fault tolerant f...

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Proceedings of the 2004 IEEE International Symposium on Intelligent Control - 2004 ISIC

作者： Polycarpou, Marios Zhang, Xiaodong Xu, Roger Yang, Yanli Kwan, Chiman Department of Electrical and Computer Engineering and Computer Science University of Cincinnati Cincinnati OH 45221 United States Dept. ECE University of Cyprus Rockville MD 20855 United States Intelligent Automation Inc. Rockville MD 20855 United States

This paper presents a neural network based approach to fault tolerant control of nonlinear flight control systems. The proposed scheme consists of three main components. First, a fault diagnosis scheme is designed to detect and identify automatically the occurrence of any faults. Second, a controller suite comprises a nominal controller and a neural network based adaptive fault tolerant controller designed to compensate for the effects of faults. Third, a reconfiguration supervisor makes decisions regarding controller reconfiguration. A simulation study using a nonlinear "Beaver" flight simulator illustrates the effectiveness of the proposed scheme and shows that flight safety is significantly improved by using the controller reconfiguration. © 2004 IEEE.

关键词： Flight dynamics

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Minimum register instruction sequence problem: Revisiting optimal code generation for DAGs 15

Minimum register instruction sequence problem: Revisiting op...

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15th International Parallel and Distributed Processing Symposium, IPDPS 2001

作者： Govindarajan, R. Yang, H. Amaral, J.N. Zhang, C. Gao, G.R. Supercomputer Education and Research Centre Dept. of Computer Science and Automation Indian Institute of Science Bangalore560 012 India Electrical and Computer Engineering University of Delaware NewarkDE19716 United States Dept. of Computing Science University of Alberta EdmontonABT6G 2E8 Canada

ISBN: (纸本)0769509908

We revisit the optimal code generation or evaluation order determination problem-the problem of generating an instruction sequence from a data dependence graph (DDG). In particular, we are interested in generating an instruction sequence S that is optimal in terms of the number of registers used by the sequence S. We call this MRIS (Minimum Register Instruction Sequence) problem. We developed an efficient heuristic solution for the MRIS problem based on the notion of instruction lineage. This solution facilitates the sharing of registers among instructions within a lineage and across lineages by exploiting the structure of a DDG. We implemented our solution on a production compiler and measured the reduction in the number of (spill) loads and (Spill) stores and the wall-clock execution time for the SPEC95 floating point benchmark suite. On average our method reduced the number of loads and stores by 11.5% and 15.9%, respectively, and decreased the total execution time by 2.5%. © 2001 IEEE.

关键词： Hazardous materials spills

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Concurrent imaging of large-scale vasculature, myelin content and cell density of post-mortem human brain with serial sectioning PSOCT-2PM

Concurrent imaging of large-scale vasculature, myelin conten...

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Optical Coherence Tomography, OCT 2022

作者： Chang, Shuaibin Wang, Hui Yang, Jiarui Fischl, Bruce Chen, Shih-Chi Boas, David A. Chen, Ichun Anderson Dept. of Electrical and Computer Engineering Boston University 8 St Mary's St Boston02215 United States Dept. of Biomedical Engineering 44 Cummington Mall Boston University Boston02215 United States Dept. of Radiology A.A. Martinos Center for Biomedical Imaging Massachusetts General Hospital 13th Street Boston02129 United States Dept. of Mechanical and Automation Engineering Chinese University of Hong Kong N.T. Shatin Hong Kong

A dual-modality microscope combining polarization sensitive optical coherence tomography (PSOCT) and two photon microscopy (2PM) is built for block-face imaging of large human brain blocks, which enriches the biologic... 详细信息

ISBN: (纸本)9781557528209

关键词： Optical tomography

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