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International Conference on Communication Workshop

作者： Meng Zheng Chi Xu Wei Liang Haibin Yu Lin Chen Key Lab. of Networked Control Syst. Shenyang China

ISBN: (纸本)9781467363068

Conventional cooperative spectrum sensing (CSS) schemes in cognitive radio networks (CRNs) require that the secondary users (SUs) report their sensing data sequentially to the fusion center, which yields long reporting delay especially in the case of large number of cooperative SUs. By exploiting the computation over multiple-access channel (CoMAC) method, this paper proposes a novel CoMAC-based CSS scheme that allows the cooperative SUs to encode their local statistics in transmit power and to transmit simultaneously the modulated symbols sequence carrying transmit power information to the fusion center. The fusion center then makes the final decision on the presence of primary users by recovering the overall test statistic of energy detection from the energy of the received signal. Performance metrics of the CoMAC-based CSS scheme, i.e., detection probability and false alarm probability, are further derived based on the central limit theorem. Finally, based on the derived detection and false alarm probabilities, both energy detection threshold and spectrum sensing time are optimized to improve the average throughput of the CRN.

关键词： CoMAC-based Cognitive Radio Networks CSS

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Distribution system fault location method using reclosure-generating traveling waves

Distribution system fault location method using reclosure-ge...

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2020 IEEE Power and Energy Society General Meeting, PESGM 2020

作者： Dong, Xinzhou Wang, Haozong Xin, Zeyu Shi, Shenxing Wang, Bin Tsinghua University State Key Lab. of Control and Simulation of Power System and Generation Equipment Dept. of Electrical Engineering Beijing China

ISBN: (纸本)9781728155081

Fault location in distribution systems includes 2 subtasks: fault distance estimation and fault section identification. This paper presents a fault location method based on reclosure-generating traveling waves and system topology. Firstly, the reclosure-generating traveling waves under normal and fault conditions are analyzed to find the traveling wave reflected by fault point, through which the fault distance could be estimated. Secondly, we propose a fault section identification method by comparing real measured traveling waves with simulated traveling waves with different potential fault points. Noticing that only time information of traveling waves rather than their magnitude is necessary, instead of using electromagnetic transient simulation, we also present a simplified simulation algorithm that only focuses on the arrival time of traveling waves based on priority queue. Experiments demonstrate that the proposed method can locate fault points in high accuracy with low computational burden. © 2020 IEEE.

关键词： Location

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The fault simulation experiment and feature extraction of rolling bearing based on casing measuring point

The fault simulation experiment and feature extraction of ro...

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Joint Conference on Machinery Failure Prevention Technology Conference, MFPT 2016 and ISA's 62nd International Instrumentation Symposium, IIS 2016

作者： Han, Te Jiang, Dongxiang Wang, Nanfei State Key Lab. of Control and Simulation of Power System and Generation Equipments Department of Thermal Engineering Tsinghua University Beijing100084 China

In this paper, the reliability of the rolling bearing fault feature extraction based on casing vibration signals is discussed. Through the fault simulation experiment of rolling bearing, the vibration data of the outer ring fault, inner ring fault and rolling element fault, which respectively comes from bearing block measuring point and casing measuring point, is acquired. Then this paper analyzed the data from the time domain, frequency domain and amplitude domain. Analysis results show that, compared to the bearing block measuring points, due to the attenuation of the pulse signal of the fault in the transmission way and the increase of signal to noise on the casing, the fault features of casing vibration signals are significantly weakened. The envelope demodulation, FFT change on the vibration signal of casing directly cannot extract the fault characteristics. However the fault characteristic frequency can be extracted from the appropriate resonance frequency band. The results provide a reference for the fault feature extraction of rolling bearing based on the signal of casing. © 2016, Society for Machinery Failure Prevention Technology. All rights reserved.

关键词： Roller bearings

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An efficient secure multichannel traffic management scheme in 2.4 GHz home automation network with IoT functions

An efficient secure multichannel traffic management scheme i...

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International Conference on Machine Tool Technology and Mechatronics Engineering, ICMTTME 2014

作者： Wei, Min Wang, Ping Key Lab. of Industrial IoT and Networked Control Chongqing University of Posts and Telecommunications Ministry of Education Chongqing China Chongqing Internet of Things Engineering Technology Research Center Chongqing China

ISBN: (纸本)9783038352464

A home automation system integrates electrical devices in a house with each other. In this paper, an efficient secure multichannel traffic management scheme for wireless home automation networks with IoT (Internet of Things) functions is proposed. The mechanism includes a channel resource optimization scheme by the centralized channel assignment algorithms and an intrusion detection scheme for security enhancement with the traffic management. We evaluated the performance of the mechanism by using the wireless data measured on real wireless home networks. The simulation results show that the scheme can effectively manage the multi-channel status of the networks and detect the intrusion attacks, which improve the overall network performance. © (2014), Trans Tech Publications, Switzerland.

关键词： Home networks

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Autoencoder-based Fault Diagnosis for Grinding system 29

Autoencoder-based Fault Diagnosis for Grinding System

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第29届中国控制与决策会议

作者： QU Xing-yu ZENG Peng Fu Dong-dong Xu chengcheng Key Lab of Networked Control System Shenyang Institute of Automation Chinese Academy of Sciences University of Chinese Academy of Sciences Northern Heavy Industries Group Co.Itd College of Information Science and Engineering Northeastern University

ISBN: (纸本)9781509046584

At present, most fault diagnosis for grinding system is based on artificial judgments, which is inefficient, low accurate, high cost and easy to cause casualties. The traditional neural network has an unsatisfying performance to predict on high dimensional dataset, and is hard to extract crucial features, which brings about terrible classification results. To solve the above problems, the paper present a deep learning based on autoencoder to realize the intelligent diagnosis for grinding system. The algorithm applies autoencoder to extract features from fault dataset, and transit the non-linearized features to Softmax classification to recognize the fault category. This paper compares autoencoder-based deep learning networks and the traditional BP neural networks in experiments, and it is concluded that the autoencoderbased deep learning outperforms BP networks in the unbalanced classification. The classification precision is up to 92.4% by using the proposed method.

关键词： Fault Diagnosis Autoencoder Softmax Classifier Deep Learning

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Design of BOOST converter based on CN3306 chip 7

Design of BOOST converter based on CN3306 chip

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7th International Conference on Electrical Engineering, control and Robotics, EECR 2021

作者： Linbo, Gan Anfei, Xu Ziqiang, Xi Xiaogang, Du Hubei Key Lab. of Solar Energy Efficient Utilization and Energy Storage System Operation Control Hubei University of Technology Wuhan430068 China

CN3306 is a current mode fixed frequency PWM boost type multiple battery charging management integrated circuit. This article introduces the basic principles and characteristics of CN3306, and designs a boost circuit based on the characteristics of CN3306 chip with stable voltage, small ripple range and low power consumption. Explained in detail how to select peripheral circuit parameters and the practical application of CN3306 in BOOST circuit, and use the PSIM simulation software to build a photovoltaic power generation system model for simulation verification, the result reached the expected value. © Published under licence by IOP Publishing Ltd.

关键词： Low power electronics

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Admission control for P2P-based Media Delivery Network

Admission control for P2P-based Media Delivery Network

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作者： Lu, Shan Yin, Baoqun Guo, Dong Department of Automation Key Lab. of Network Communication System and Control University of Science and Technology of China Hefei 230027 China

ISBN: (纸本)9787894631046

With wider application of P2P-based Media Delivery Network (P2P-based MDN), much work has been done to improve the system' performance and efficiency in the process of media contents sharing. In this paper, we first propose a specific partially observable Markov Decision Process (POMDP) model for admission control of P2P-based MDN. Based on this model, we provide the observation-based randomized policy to conduct admission control and optimize the policy by applying policy-gradient algorithm. Observation-based policy can promote the system's performance in real time aspect and policy optimizing can increase the accuracy of controller's judgments based on partial information. Admission strategy in the paper can save the cost in operating the system for media service providers. Bandwidth allocation policy is designed to reduce service delay and provide high-quality service. The comparison results of system's performances under different policies indicate that, partial service can utilize the system's resource in a better way.

关键词： Markov processes

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Robust reinforcement learning-based tracking control for wheeled mobile robot

Robust reinforcement learning-based tracking control for whe...

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2nd International Conference on Computer and Automation Engineering, ICCAE 2010

作者： Luy, Nguyen Tan Thanh, Nguyen Duc Thanh, Nguyen Thien Ha, Nguyen Thi Phuong National Key Lab. for Digital Control and System Engineering Hochiminh City University of Technology Viet Nam Department of Automatic Control Hochiminh City University of Technology Viet Nam

ISBN: (纸本)9781424455850

This paper proposes a method to design a robust reinforcement learning-based tracking control scheme for the wheeled mobile robot. A policy iteration algorithm and a neural network are used to design an adaptive critic robust controller. A H∞ - tracking performance index optimal function is evaluated by this con troller. The stability of the closed-loop system while learning is proven by Lyapunov theory. The simulation results for wheeled mobile robot verify the effects of the proposed controller. ©2010 IEEE.

关键词： Mobile robots

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Adaptive backstepping position control for electro-hydraulic servo systems

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Journal of Computational Information systems 2013年第23期9卷 9629-9636页

作者： Yang, Fang Li, Jishun Si, Donghong Zhang, Wei Key Lab. for Machinery Design and Transmission System of Henan Provence Henan University of Science and Technology Luoyang 471003 China Xi'an Flight Automation Control Research Institute Aviation Industry Corporation of China Xi'an 710072 China

A robust adaptive backstepping control method for electro-hydraulic position servo system is investigated. For uncertainties nonlinear math model of electro-hydraulic position servo system, designed cerebellar model articulation controller (CMAC) neural network to estimate the system unknown uncertainties, then used backstepping method to acquire control Lyapunov functions (CLFs) step by step. Based on Lyapunov stability theory, designed robust adaptive controller and CMAC neural network weights turn laws, which can guarantee the output tracking error converging to zero while the system states are bounded. The simulation results demonstrate that the proposed adaptive backstepping controller have the good tracking performance and strong robustness to the parameter uncertainties and external loading perturbation. Copyright © 2013 Binary Information Press.

关键词： Position control

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system encapsulation realization of SCADA based on IEC61970

System encapsulation realization of SCADA based on IEC61970

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2012 IEEE International Conference on Computer Science and Automation Engineering, CSAE 2012

作者： Wang, Ting Liu, Chi Sun, Xiao-Jiang Tao, Zhi-Jian Wang, Ping Key Lab. of Industrial Wireless Network and Networked Control Ministry of Education Chongqing University of Posts and Telecommunications Chongqing China Chongqing New Century Electrical Co. Ltd. Chongqing China

ISBN: (纸本)9781467300865

As the revolution of electric power industry and software engineering technology, various heterogeneous system of dispatching automation has constantly emerged. IEC61970 standards provide integration methods foe all kinds of high efficient system. On the base of thorough research on standards, we put forward the idea of using IEC61970 to upgrade the legacy SCADA system. Besides this, we introduced the method of encapsulating Chongqing New Century Electrical Company's legacy SCADA system. This method tries the research and practice of the standard under the premise of legacy investment protection. © 2012 IEEE.

关键词： Common object request broker architecture (CORBA)

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