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5th International Conference on Informatics in Control, automation and Robotics, ICINCO 2008

作者： Wachten, Christian Friedrich, Lars Müller, Claas Reinecke, Holger Ament, Christoph Department of Microsystems Technology University of Freiburg Georges-Koehler-Allee 103 79110 Freiburg Germany Institue for Automation and Systems Engineering TU Ilmenau 98693 Ilmenau Germany

ISBN: (纸本)9789898111326

Laser trackers are important devices in position metrology. A moving reflector is tracked by a laser beam to determine its position in space. To ensure a proper function of the device the feedback control loop is an essential part. An analog PI controller with online parameter adaptation and absolute distance measurement ability is used to guarantee an optimal dynamic system. The feedback controller is connected to a quadrant detector which serves as the sensor element in the control loop. The position of an incoming laser beam is measured by the quadrant detector and the controller provides the input signals for a subsequent actuator. The control variable is the deviation of the laser beam from the centre of the diode which should ideally be zero. The actuator consists of two axes and each one is equipped with a rotatable mirror. The task of the controller is to rotate the mirrors in such a way so that the laser beam follows the movements of the reflector. To design an optimal controller linear, time-invariant models of the actuator and the position sensor are developed to optimize its parameters. The gain of the plant correlates with the distance between the reflector and the laser tracker. To achieve the optimal dynamic performance the controller is automatically adapted to the distance during operation. A method based on oscillation injection to measure the absolute distance is developed. Due to higher dynamic demands a standard analog PI controller is implemented with the controller gain tuned by digital potentiometers. A microcontroller is used to adjust the parameters and to estimate the distance. During the power up sequence and in case of a beam loss the system is completely controlled by the digital part.

关键词： Laser beams

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Autoencoder-assisted Feature Ensemble Net for Incipient Faults

arXiv

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arXiv 2024年

作者： Gao, Mingxuan Wang, Min Chen, Maoyin Institue of education Tsinghua University Beijing100084 China Department of Advanced Design and Systems Engineering City University of Hong Kong Hong Kong School of Automation Engineering University of Electronic Science and Technology of China Chengdu611731 China Department of Automation Tsinghua University Beijing100084 China

Deep learning has shown the great power in the field of fault detection. However, for incipient faults with tiny amplitude, the detection performance of the current deep learning networks (DLNs) is not satisfactory. Even if prior information about the faults is utilized, DLNs can’t successfully detect faults 3, 9 and 15 in Tennessee Eastman process (TEP). These faults are notoriously difficult to detect, lacking effective detection technologies in the field of fault detection. In this work, we propose Autoencoder-assisted Feature Ensemble Net (AE-FENet): a deep feature ensemble framework that uses the unsupervised autoencoder to conduct the feature transformation. Compared with the principle component analysis (PCA) technique adopted in the original Feature Ensemble Net (FENet), autoencoder can mine more exact features on incipient faults, which results in the better detection performance of AE-FENet. With same kinds of basic detectors, AE-FENet achieves a state-of-the-art average accuracy over 96% on faults 3, 9 and 15 in TEP, which represents a significant enhancement in performance compared to other methods. Plenty of experiments have been done to extend our framework, proving that DLNs can be utilized efficiently within this architecture. Copyright © 2024, The Authors. All rights reserved.

关键词： Fault detection

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Introduction

Communications and Control Engineering

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Communications and Control engineering 2011年第9780857292551期 1-15页

作者： Sun, Zhendong Ge, Shuzhi Sam College Automation Science & Engineering Center for Control and Optimization South China University of Technology Guangzhou510640 China Department of Electrical and Computer Engineering The National University of Singapore Singapore Singapore Robotics Institue and Institute of Intelligent Systems and Information Technology University of Electronic Science and Technology of China Chengdu China

Chapter 1 briefly introduces the problem formations and the organization of the book. In particular, given a feasible set of switching signals, the concepts of stability and stabilizability are introduced, and the related problems of stability and stabilization are briefly formulated and discussed. Examples and simulations are provided to exhibit the primary features of the problems with various switching mechanisms. © 2011, Springer-Verlag London Limited.

关键词： Stabilization

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Preface

Communications and Control Engineering

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Communications and Control engineering 2011年第9780857292551期 vii-xi页

作者： Sun, Zhendong Ge, Shuzhi Sam College Automation Science & Engineering Center for Control and Optimization South China University of Technology Guangzhou510640 China Robotics Institue and Institute of Intelligent Systems and Information Technology University of Electronic Science and Technology of China Chengdu China Department of Electrical and Computer Engineering The National University of Singapore Singapore Singapore

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