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International Conference on Communication Software and Networks, ICCSN

作者： Zhao Wu Yu Zhang Long Jiang Song Jian Department of Electronic Engineering Tsinghua University Tsinghua National Laboratory for Information Science and Technology Beijing P. R. China National Engineering Lab. for DTV (Beijing) Shenzhen City Key Laboratory of Digital TV System (Guangdong Province Key Laboratory of Digital TV System) Guangdong China

ISBN: (纸本)9781479919857

Burst data transmission is widely used in wireless communications. Rapid and robust symbol timing is critical for burst communication and it has a great impact on the performance of subsequent demodulation and the whole system. Feed-forward symbol timing has the advantage of fast convergence and it is very suitable for burst communication. Feed-forward symbol timing estimation, generally speaking, can be classified into two broad categories: non-data-aided symbol timing estimation and data-aided symbol timing estimation. In this paper we present a novel data-aided symbol timing estimation. The symbol timing offset estimation is based on the cross correlation output of the preamble and square processing is utilized, which is similar to the non-data-aided symbol timing. The proposed estimation exhibits good performance with low complexity. Besides, it is shown by computer simulations that the method is not sensitive to roll-off factor and works well at low SNR.

关键词： Timing Estimation Correlation Accuracy Noise Fourier transforms Complexity theory

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A hybrid genetic algorithm - Sequential quadratic programing approach for canting keel optimization in transverse stability of small boat design

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International Conference on Advanced engineering Theory and Applications 2013, AETA 2013

作者： Le, Tat-Hien Duy, Vo Hoang Phuong, Pham Nhat Nam, Jong-Ho Department of Naval Architecture and Marine Engineering Ho Chi Minh City University of Technology Viet Nam National Key Lab. of Digital Control and System Engineering Vietnam National University No. 19 Nguyen Huu Tho Street Ho Chi Minh City Viet Nam Faculty of Electrical and Electronics Engineering Ton Duc Thang University No. 19 Nguyen Huu Tho Street Ho Chi Minh City Viet Nam Division of Naval Architecture and Ocean Systems Engineering Korea Maritime University Busan Korea Republic of

ISBN: (纸本)9783642419676

The transverse stability is one of the most important characteristics of the ship in survivability. This factor can be influenced by wind, moving cargoes and passengers. In order to avoid maritime accidents due to parametric rolling, several ways are considered in the practical situation such as active and passive anti rolling method. The canting keel is a practical tool for the enhancement of ship stability. In the early ship design stage, this problem is considered to be multimodal objective problem. In the present research, a hybrid optimization technique, genetic algorithm - sequential quadratic programing (GA-SQP) is developed to determine the appropriate parametric values of design of canting keel. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Genetic algorithms

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Two-Stage OD Flow Prediction for Emergency in Urban Rail Transit

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IEEE Transactions on Intelligent Transportation systems 2024年第1期25卷 920-928页

作者： Zhu, Guangyu Ding, Jiacun Wei, Yun Yi, Yang Xu, Sendren Sheng-Dong Wu, Edmond Q. Beijing Jiaotong University Key Lab. of Transport Industry of Big Data Application Technologies for Comprehensive Transport The Beijing Research Center of Urban Traffic Information Sensing and Service Technologies Beijing100044 China Beijing Mass Transit Railway Operation Corporation Ltd. Beijing100014 China Yangzhou University College of Information Engineering Yangzhou225127 China National Taiwan University of Science and Technology Automation and Control Center The Graduate Institute of Automation and Control Taipei106335 Taiwan Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China The Shanghai Engineering Research Center of Intelligent Control and Management Department of Automation Shanghai200240 China

Urban rail transit (URT) is vulnerable to natural disasters and social emergencies including fire, storm and epidemic (such as COVID-19), and real-time origin-destination (OD) flow prediction provides URT operators with important information to ensure the safety of URT system. However, hindered by the high dimensionality of OD flow and the lack of supportive information reflecting the real-time passenger flow changes, study in this area is at the beginning stage. A novel model consisting of two stages is proposed for OD flow prediction. The first stage predicts the inflows of all stations by Long Short-Term Memory (LSTM) in real time, where the dimension is reduced compared with predicting OD flows directly. In the second stage, the notion of separation rate, namely, the proportion of inbound passengers bounding for another station, is estimated. Finally, The OD flow is predicted by multiplying the inflow and separation rate. Experiments based on Hangzhou Metro dataset show the proposed model outperforms the contrast model in weighted mean average error (WMAE) and weighted mean square error (WMSE). Results also suggest that the proposed prediction model performs better on weekdays than on weekends, and with greater accuracy on larger OD flows. © 2000-2011 IEEE.

关键词： Forecasting

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A 4-Channel Ultrafast Wavelength-Swept REC-DFB Laser Array for Fiber Bragg Grating Interrogation

A 4-Channel Ultrafast Wavelength-Swept REC-DFB Laser Array f...

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2023 Asia Communications and Photonics Conference/2023 International Photonics and Optoelectronics Meetings, ACP/POEM 2023

作者： Meng, Lingxin Dai, Pan Ban, Qilu Xu, Kaichuan Wang, Jiacheng Li, Zhen Wang, Feng Zeng, Jie Li, Shaobo Ma, Xiang Chen, Xiangfei Res. Center of Precision Photonics Integration and System Application of the Ministry of Education College of Engineering and Applied Sciences Nanjing University Key Lab. of Intelligent Optical Sensing and Manipulation of the Ministry of Education Engineering National Laboratory of Solid State Microstructures Nanjing210023 China Nanjing University of Aeronautics and Astronautics State Key Laboratory of Mechanics and Control for Aerospace Structures Nanjing210016 China The 54th Research Institute of China Electronics Technology Group Corporation Optical Communication Research and Development Center Shijiazhuang050081 China

ISBN: (纸本)9798350312614

We present a four-channel ultrafast wavelength-swept distributed feedback (DFB) semiconductor laser array based on the reconstruction-equivalent-chirp (REC) technique using instantaneous injection current modulation. With the aid of our designed laser driving circuit system consists of the microcontroller unit (MCU), field-programmable gate array (FPGA) and negative metal-oxide-semiconductor field effect transistors (n-MOSFETs), the precise pulse driving current for the 4-channel wavelength-swept REC-DFB laser array can be generated and a fast tuning of 16.424 nm within 10 μs is achieved. To further investigate the tuning performance of the proposed wavelength-swept laser source, we then applied it to the fiber Bragg grating (FBG) interrogation system and four FBG temperature sensor arrays were successfully demodulated. The development of high-efficient optical sensing systems heavily relies on the significance of the ultrafast wavelength-swept laser source, which has the potential to greatly enhance FBG interrogator performance in the future. © 2023 IEEE.

关键词： DFB laser array fast wavelength-swept fiber Bragg grating interrogation REC technique

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Study on Modelling of a DC Coaxial Motor in Marine Applications

Study on Modelling of a DC Coaxial Motor in Marine Applicati...

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International Conference on system Science and engineering (ICSSE)

作者： Nguyen Duc Thinh Duong Ngoc Quan Nguyen Tan Tien Do Xuan Phu Department of Electrical Engineering and Information Technology Vietnamese-German University Binh Duong Vietnam Institute of Engineering HUTECH University of Technology Ho Chi Minh city Vietnam National Key Laboratory of Digital Control and System Engineering Ho Chi Minh University of Technology Ho Chi Minh city Vietnam MediRobotic Lab. Vietnamese-German University Binh Duong Vietnam

The main goal of this paper studies modeling of a direct current coaxial motor (DCCM) and testing the main parameters of DCCM on the experimental model. The DCCM contains two rotors named inner runner and outer runner. The inner runner and the outer runner rotate in opposite directions to each other. The shaft of the inner runner and the shaft of the outer runner are coincident and inserted on two separate bearings. To prove this idea, the mathematic model is achieved by a combination of a mathematic model of DC motor and mathematic model of single phase coaxial motor. Simulation result of the mathematic model in Matlab.shows the truth of the hypothesis of the design. The result of testing DCCM of the experimental model is fit to the result of simulation of DCCM in Matlab. Consequently, the DCCM can substitute for other kinds of propellers especially in marine applications.

关键词： DC motors Mathematical model Shafts Torque measurement Induction motors Torque

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Model Predictive control with Reach-avoid Analysis

arXiv

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arXiv 2023年

作者： Ren, Dejin Lu, Wanli Lv, Jidong Zhang, Lijun Xue, Bai State Key Lab. of Computer Science Institute of Software CAS Beijing China University of Chinese Academy of Sciences Beijing China National Engineering Research Center of Rail Transportation Operation and Control System Beijing Jiaotong University Beijing China

In this paper we investigate the optimal controller synthesis problem, so that the system under the controller can reach a specified target set while satisfying given constraints. Existing model predictive control (MPC) methods learn from a set of discrete states visited by previous (sub-)optimized trajectories and thus result in computationally expensive mixed-integer nonlinear optimization. In this paper a novel MPC method is proposed based on reach-avoid analysis to solve the controller synthesis problem iteratively. The reach-avoid analysis is concerned with computing a reach-avoid set which is a set of initial states such that the system can reach the target set successfully. It not only provides terminal constraints, which ensure feasibility of MPC, but also expands discrete states in existing methods into a continuous set (i.e., reach-avoid sets) and thus leads to nonlinear optimization which is more computationally tractable online due to the absence of integer variables. Finally, we evaluate the proposed method and make comparisons with state-of-the-art ones based on several examples. Copyright © 2023, The Authors. All rights reserved.

关键词： Model predictive control

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On RF-Chain Limited Spatial Modulation Aided NOMA: Spectral Efficiency Analysis

On RF-Chain Limited Spatial Modulation Aided NOMA: Spectral ...

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IEEE Globecom Workshops

作者： Yue Sun Jintao Wang Lina Shi Xun Zhang Jian Song Electronic Engineering Department Tsinghua University Beijing P. R. China National Engineering Lab. for DTV(Beijing) Beijing P. R. China Shenzhen City Key Laboratory of Digital TV System Department of Electrical Engineering Institut Suprieur d???Electronique de Paris (ISEP) France

ISBN: (数字)9781728109602

ISBN: (纸本)9781728109619

Recently, the combination of spatial modulation (SM) and non- orthogonal multiple access (NOMA) is proposed to enhance the spectral efficiency (SE) of downlink multi-user (MU) systems. However, traditional SM aided NOMA (SM-NOMA) systems require many radio frequency (RF) chains, which increases the implementation cost and lowers the energy efficiency (EE). In this paper, we propose a novel single-RF SM-NOMA system, in which the spatial domain bits can be flexibly divided for different user equipments (UEs). In addition, we analyze the SE of our proposed single-RF SM-NOMA system, and a closed-form SE lower bound is also derived. The tightness of our proposed SE lower bound is validated via Monte Carlo simulations, and the SE comparisons of different SM-NOMA systems are also shown, which illustrates the effectiveness of the proposed single-RF SM-NOMA system.

关键词： NOMA Downlink Interference Radio frequency Signal to noise ratio Modulation Covariance matrices

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Improved pitch angle control for variable-speed wind turbine system

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International Conference on Advanced engineering Theory and Applications 2013, AETA 2013

作者： Van, Tan Luong Nguyen, Buu Pham Nhat Tan Truong, Trung Hieu Trang, Tran Thanh Department of Electrical Engineering Ho Chi Minh City Electric Power College 554 Ha Huy Giap District 12 Ho Chi Minh City Viet Nam Department of Power System Ho Chi Minh City Electric Power College 554 Ha Huy Giap District 12 Ho Chi Minh City Viet Nam Department of Electrical-Mechanical Engineering Ho Chi Minh City Electric Power College 554 Ha Huy Giap District 12 Ho Chi Minh City Viet Nam Department of Electronics and Telecommunication Engineering Van Hien University 665-667-669 Dien Bien Phu District 3 Ho Chi Minh City Viet Nam National Key Lab. of Digital Control and System Engineering University of Technology Vietnam National University Ho Chi Minh City 268 Ly Thuong Kiet District 10 Ho Chi Minh City Viet Nam

ISBN: (纸本)9783642419676

In this paper, a pitch angle control scheme based on the fuzzy logic is proposed for the variable-speed wind turbine systems. The generator output power and rotor speed are used as control input variables for the fuzzy logic controller (FLC), which are effective to compensate for the nonlinear characteristic of the pitch angle to the wind speed. Also, a speed sensorless technique estimating the rotational speed is employed for the proposed control method. The effectiveness of the proposed method is verified by MATlab.simulation results for a 2-MW PMSG wind turbine system. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Fuzzy logic

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A comparative study on D converter based on control schemes of maximum extracted power

A comparative study on D converter based on control schemes ...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： Ahmad El Khateb M.N. Uddin N. A. Rahim Barry W. Williams Automatic Control and Human-Machine Systems LAMIH UMR/CNRS Valenciennes France Electronic Engineering Department Tsinghua University Tsinghua National Laboratory for Information Science and Technology (TNList) Beijing P. R. China Shenzhen City Key Laboratory of Digital TV System Valeo Powertrain Systems Amiens France National Engineering Lab. for DTV(Beijing) Beijing P. R. China

ISBN: (纸本)9781479983988

This paper presents analysis and control of D converter, which has continuous input and output current to obtain maximum power transfer from a photovoltaic (PV) system. Examining the maximum power involves optimization and control techniques that ensure maximum power extraction enhancement. Traditional converters have rather high input ripple current that originates considerable loss of power extraction when linked to photovoltaic panels. Operating with zero input ripple current enlarges the power obtained from the PV panel without employing electrolytic capacitor. Experiment and simulation of the converter performance support and extol the system concept and establish a balanced view among several types of used controllers as well.

关键词： Inverters Capacitors Photovoltaic systems Radiation effects control systems Fuel cells

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Nonlinear control of PMSG wind turbine systems

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International Conference on Advanced engineering Theory and Applications 2013, AETA 2013

作者： Van, Tan Luong Truong, Trung Hieu Nguyen, Buu Pham Nhat Tan Trang, Tran Thanh Department of Basics Ho Chi Minh City Electric Power College 554 Ha Huy Giap District 12 Ho Chi Minh City Viet Nam Department of Electrical-Mechanical Engineering Ho Chi Minh City Electric Power College 554 Ha Huy Giap District 12 Ho Chi Minh City Viet Nam Department of Power System Ho Chi Minh City Electric Power College 554 Ha Huy Giap District 12 Ho Chi Minh City Viet Nam Department of Electronics and Telecommunication Engineering Van Hien University 665-667-669 Dien Bien Phu District 3 Ho Chi Minh City Viet Nam National Key Lab. of Digital Control and System Engineering University of Technology Vietnam National University Ho Chi Minh City 268 Ly Thuong Kiet District 10 Ho Chi Minh City Viet Nam

ISBN: (纸本)9783642419676

This paper proposes a control scheme for the permanent magnet synchronous generator (PMSG) wind power system. The DC-link voltage can be controlled at the machine-side converter (MSC), while the grid-side converter (GSC) controls the grid active power for a maximum power point tracking (MPPT). At the grid fault condition, the DC-link voltage controller is designed using a feedback linearization (FL) theory. For the MPPT, it is also developed for the PMSG wind turbines to continuously generate the maximum electrical power without any sensor. The validity of this control algorithm has been verified by simulation 2-MW PMSG wind turbine system. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Feedback linearization

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