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Estimation of velocity potential of water waves using a Luenberger-like observer

Science China(Information Sciences) 2020年第12期63卷 139-152页

作者： Yang YU Hai-Long PEI Cheng-Zhong XU Key Laboratory of Autonomous Systems and Networked Control Ministry of EducationSouth China University of Technology Unmanned Aerial Vehicle Systems Engineering Technology Research Center of Guangzhou South China University of Technology LAGEPP University Claude Bernard-Lyon 1

We propose a Luenberger-like observer for a water wave system. The water wave dynamics are assumed to be governed by the linearized water wave equation(LWWE). Our proposed observer estimates the velocity potential of water waves by measuring only the surface wave elevation. The information of the water-wave velocity field is then extracted from the gradient of the velocity potential. It is shown that the estimation error of the observer converges exponentially to zero as time tends to infinity. Furthermore,we numerically solve the LWWE and observer equation by the finite difference method. The efficiency of our proposed numerical scheme and the performance of the observer are validated by numerical simulation results.

关键词： linearized water wave equation LWWE Luenberger-like observer numerical simulations

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Stabilization of Continuous-Time systems Against Stochastic Network Uncertainties:Fundamental Variance Bounds

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Journal of systems Science & Complexity 2021年第5期34卷 1858-1878页

作者： QI Tian CHEN Jie School of Automation Science and Engineering Key Laboratory of Autonomous Systems and Networked ControlSouth China University of TechnologyGuangzhou 510640China Department of Electrical Engineering City University of Hong KongHong KongChina

This paper studies the stabilizability and stabilization of continuous-time systems in the presence of stochastic multiplicative *** authors consider multi-input,multi-output(MIMO)linear time-invariant systems subject to multiple static,structured stochastic uncertainties,and seek to derive fundamental conditions to ensure that a system can be stabilized under a mean-square *** the stochastic control framework,this problem can be considered as one of optimal control under state-or input-dependent random noises,while in the networked control setting,a problem of networked feedback stabilization over lossy communication *** authors adopt a mean-square small gain analysis approach,and obtain necessary and sufficient conditions for a system to be meansquare stabilizable via output *** single-input,single-output(SISO)systems,the condition provides an analytical bound,demonstrating explicitly how plant unstable poles,nonminimum phase zeros,and time delay may impose a limit on the uncertainty variance required for mean-square *** MIMO minimum phase systems with possible delays,the condition amounts to solving a generalized eigenvalue problem,readily solvable using linear matrix inequality optimization techniques.

关键词： Mean-square small gain theorem multiplicative stochastic uncertainty networked control

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The Trust Evaluation and Anomaly Detection Model of Industrial control Equipment Based on Multiservice and Multi-attribute 7

The Trust Evaluation and Anomaly Detection Model of Industri...

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7th International Conference on Computer and Communications, ICCC 2021

作者： Xin, Chen Xianda, Liu Yiheng, Jiang Chen, Wang Chinese Academy of Sciences Key Laboratory of Networked Control Systems Shenyang Institute of Automation Shenyang China

ISBN: (纸本)9781665409506

In the industrial control system, in order to solve the problem that the installation of smart devices in a transparent environment are faced with the unknown attack problems, because most of the industrial control equipment to detect unknown risks, Therefore, by studying the security protection of the current industrial control system and the trust mechanism that should be widely used in the Internet of things, this paper presents the abnormal node detection mode based on comprehensive trust applied to the industrial control system scenarios. This model firstly proposes a model, which fuses direct and indirect trust values into current trust values through support algorithm and vector similarity algorithm, and then combines them with historical trust values, and gives the calculation method of each trust value. Finally, a method to determine abnormal nodes based on comprehensive trust degree is given to realize a detection process for all industrial control nodes. By analyzing the real data case provided by Melbourne Water, it is concluded that this model can improve the detection range and detection accuracy of abnormal nodes. It can accurately judge and effectively resist malicious behavior and also have a good resistance to aggression. © 2021 IEEE.

关键词： Anomaly detection

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A Novel SPICE Modeling Approach for SiC D-MOSFET Based on BSIM3HV 3

A Novel SPICE Modeling Approach for SiC D-MOSFET Based on BS...

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3rd International Symposium on Semiconductor and Electronic Technology, ISSET 2024

作者： Cheng, He Yang, Zhijia Zhang, Chao Zhang, Zhipeng Shenyang Institute of Automation Chinese Academy of Sciences Key Laboratory of Networked Control Systems Shenyang China

ISBN: (纸本)9798350390285

SiC MOSFETs have emerged as a highly promising solution for power electronics applications due to their superior material properties, including a wide bandgap, high thermal conductivity, high critical electric field strength, and high saturation velocity of charge carriers. Accurate compact modeling of SiC D-MOSFETs is crucial when designing analog circuits for applications such as solar inverters, motor drives, high-voltage DC-DC converters, and uninterruptible power supplies (UPS). The current characteristics of SiC MOSFETs can be numerically assessed using TCAD simulation, which compares them against measurements from the device datasheet. In this paper, we present a comprehensive modeling approach for the SCT50N120 1200V SiC D-MOSFET from STMicroelectronics. The well-established industry-standard BSIM3HV SPICE model is employed, and its key parameters are optimized to achieve an accurate fit between the simulated and measured current characteristics. This optimization process yields an refined SPICE circuit simulation model for the targeted SiC D-MOSFET device, which is subsequently verified through simulations. Ultimately, we demonstrate reasonable agreement between the optimized SPICE model simulations and the measured datasheet results for the IDS- VGS and IDS-VDS characteristics across various bias conditions. © 2024 IEEE.

关键词： SPICE

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Discrete Time-Varying Four Fundamental Operations Implemented by Euler Forward Difference 36

Discrete Time-Varying Four Fundamental Operations Implemente...

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第36届中国控制会议

作者： Yunong Zhang Huihui Gong Jian Li Binbin Qiu Min Yang School of Information Science and Technology Sun Yat-sen University Key Laboratory of Autonomous Systems and Networked Control Ministry of Education

ISBN: (纸本)9781538629185

Time-varying problems are widely encountered in various engineering fields,such as signal processing,construction monitoring,and ***,traditional arithmetics intrinsically aim at time-invariant problems *** running on relatively low-speed processing units,traditional arithmetics may generate quite large and unacceptable lagging *** this paper,the problems of discrete time-varying four fundamental operations(TVFFO) are *** order to eliminate the lagging errors,based on Zhang dynamics(ZD) and Euler forward difference(EFD) formula,discrete computing models,which are named Euler-implemented discrete ZD(EIDZD) models,are proposed and *** that the EIDZD models are with an error pattern 0(g),where g denotes the sampling ***,illustrative numerical experiments of EIDZD models are also conducted,which show the high accuracy of EIDZD models.

关键词： Time-varying four fundamental operations(TVFFO) Zhang dynamics(ZD) Continuous time-varying models Euler forward difference(EFD) Euler-implemented discrete ZD(EIDZD) models Numerical experiments

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Robust controller Design for BTT Missile Equipped with Grid Fin 35

Robust Controller Design for BTT Missile Equipped with Grid ...

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第35届中国控制会议

作者： XU Zhaoqing PEI Hailong College of Automation Science and Engineering Key Laboratory of Autonomous Systems and Networked Control Ministry of EducationSouth China University of Technology

ISBN: (纸本)9781509009107

The robust controller is designed for certain BTT missile which is equipped with grid fin. In order to design the controller of BTT missile, the aerodynamic force of grid fin is analyzed when the grid fin rotates in flying, then the aerodynamic force and aerodynamic moment along with movement equations are linearized based on the small perturbation linear theory, the beginning state of the cruise is chosen as the feature point, and then the dynamical coefficient are calculated, then the longitudinal and lateral perturbation equations are established. The dynamic responses of each motion deviation under the longitudinal and lateral free disturbance are obtained through solving the perturbation equations. The transfer functions and the dynamic responses under the step deflection of grid fin are derived, then the dynamic characteristics of the missile can be obtained. The results indicate that the grid fin can provide favorable stability. The H controller of pitch and lateral bank channels are designed based on dynamic characteristics analysis, the simulation results indicate that the system dynamic performance can satisfy the requirement, and H controller has a fine robustness for the parametric variation.

关键词： BTT missile H control dynamic characteristics grid fin

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ADRC for Nonlinear Time-Variant systems with Unknown orders 35

ADRC for Nonlinear Time-Variant Systems with Unknown orders

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第35届中国控制会议

作者： LI Xiangyang AI Wei TIAN Senping Key Laboratory of Autonomous Systems and Networked Control Ministry of EducationSchool of Automation Science and EngineeringSouth China University of Technology

ISBN: (纸本)9781509009107

Active disturbance rejection control(ADRC) shows much promise in obtaining consistent response in an industrial control system full of *** traditional applications of ADRC,the system's order is *** paper concerns with the capability of ADRC for nonlinear time-variant systems with unknown *** controlled system's local model whose order is set according to the controller is introduced to make ADRC ***,an extend state filter(ESF) is added to the proposed ADRC to attain smoother control *** proposed ADRC based on local model is validated in simulation for a nonlinear,time-varying system with unknown order and uncertainties.

关键词： ADRC local model extended state observer nonlinear time-variant system unknown order data-driven control

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GPS/SINS/MC Integrated Navigation Algorithm Research Based on Zero Velocity Update 36

GPS/SINS/MC Integrated Navigation Algorithm Research Based o...

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第36届中国控制会议

作者： Fuchun Liu Shengjie Cao Yifeng Chen Xuan Su College of Automation Science and Engineering the Key Laboratory of Autonomous Systems and Networked Control（ASNC）Ministry of EducationSouth China University of Technology

ISBN: (纸本)9781538629185

The navigation output accuracy of SINS/GPS integrated navigation system will decline when GPS is not *** Velocity Update（ZUPT） technology is used for the error correction in this *** a relevant algorithm,the zero velocity detection algorithm is applied in the carrier *** method has achieved an integrated navigation system filtering algorithm based on *** simulation and experiment results show that the algorithm effectively improves the accuracy of navigation by limiting the velocity value of GPS in zero-velocity condition.

关键词： Integrated Navigation Zero Velocity Update Kalman Filter

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Application of stand-off double-pulse laser-induced breakdown spectroscopy in elemental analysis of magnesium alloy

Application of stand-off double-pulse laser-induced breakdow...

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作者： Qi, Lifeng Sun, Lanxiang Xin, Yong Cong, Zhibo Li, Yang Yu, Haibin Key Laboratory of Networked Control Systems Shenyang Institute of Automation Chinese Academy of Sciences Shenyang110016 China

In this study, a stand-off and collinear double pulse laser-induced breakdown spectroscopy (DP LIBS) system was designed, and the magnesium alloy samples at a distance of 2.5 m away from the LIBS system were measured. The effect of inter-pulse delay on spectra was studied, and the signal enhancement was observed compared to the single pulse LIBS (SP LIBS). The morphology of the ablated crater on the sample indicated a higher efficiency of surface pretreatment in DP LIBS. The calibration curves of Ytterbium (Y) and Zirconium (Zr) were investigated. The square of the correlation coefficient of the calibration curve of element Y reached up to 0.9998.

关键词： Magnesium alloys

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Research on Indoor Robot SLAM of RBPF Improved with Geometrical Characteristic Localization 29

Research on Indoor Robot SLAM of RBPF Improved with Geometri...

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第29届中国控制与决策会议

作者： Liu Fuchun Chen Yifeng Li Yunze College of Automation Science and Engineering the Key Laboratory of Autonomous Systems and Networked Control(ASNC)Ministry of EducationSouth China University of Technology

ISBN: (纸本)9781509046584

LIDAR and odometer are used as the main sensors in this paper, with the two-wheeled self-balancing robot as the research and experiment platform, this topic has researched the way to SLAM when the robot is in unfamiliar environment with uncertain position and orientation. On the issue of setting the dynamic threshold value to zone the LIDAR scanning points in the process of constructing the geometry map, with the consideration of the character of RPLIDAR which is used in our research, this paper has analyzed and proposed the specific dynamic threshold values, which make the zoning of LIDAR scanning points more reasonable. In order to improve the robustness of SLAM, we have used regular particle filter(RPF) as the location algorithm. In order to solve the problem of unable to add auxiliary information under the traditional MCL framework, we have taken full use of the high accuracy character of the geometry matching and locating, and have used the result of it to improve the importance density function of RPF. Based on the idea of Rao-Blackwellization, the improved RBPF-SLAM has been proposed. The validity and feasibility of the improved RBPF-SLAM have been proved with simulations and experiments.

关键词： Simultaneous Localization and Mapping LIDAR robot particle filter

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