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Stability analysis for continuous-time systems with actuator saturation

控制理论与应用（英文版） 2009年第4期7卷 352-358页

作者： Ting SHI Hongye SU Jian CHU State Key Laboratory of Industrial Control Technology Institute of Cyber-Systems and Control Zhejiang University Hangzhou Zhejiang 310027 China

The aim of this paper is to study the determination of the stability regions for continuous-time systems subject to actuator saturation. Using an affine saturation-dependent Lyapunov function, a new method is proposed to obtain the estimation of the domain of attraction of the closed-loop system. A family of linear matrix inequalities （LMIs） that provides sufficient conditions for the existence of this type of Lyapunov function are presented. The results obtained in this paper can reduce the conservativeness compared with the existing ones. Numerical examples are given to illustrate the effectiveness of the proposed results.

关键词： Actuator saturation Stability analysis Domain of attraction Invariant set Linear matrix inequality （LMI）

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Modified extremal optimization for the hard maximum satisfiability problem

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Journal of Zhejiang University-Science C(Computers and Electronics) 2011年第7期12卷 589-596页

作者： Guo-qiang ZENG 1,Yong-zai LU 2,Wei-Jie MAO 2 (1 College of Physics & Electronic Information Engineering,Wenzhou University,Wenzhou 325035,China) (2 state key laboratory of industrial control technology,institute of cyber-systems and control,Zhejiang University,Hangzhou 310027,China) College of Physics & Electronic Information Engineering Wenzhou University State Key Laboratory of Industrial Control Technology Institute of Cyber-Systems and Control Zhejiang University

Based on our recent study on probability distributions for evolution in extremal optimization (EO),we propose a modified framework called EOSAT to approximate ground states of the hard maximum satisfiability (MAXSAT) problem,a generalized version of the satisfiability (SAT) *** basic idea behind EOSAT is to generalize the evolutionary probability distribution in the Bose-Einstein-EO (BE-EO) algorithm,competing with other popular algorithms such as simulated annealing and *** results on the hard MAXSAT instances from SATLIB show that the modified algorithms are superior to the original BE-EO algorithm.

关键词： Extremal optimization (EO) Evolution Probability distributions Maximum satisfiability (MAXSAT) problem

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Exploring Token-Level Augmentation in Vision Transformer for Semi-Supervised Semantic Segmentation

arXiv

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arXiv 2025年

作者： Zhang, Dengke Tang, Quan Liu, Fagui Mei, Haiqing Chen, C.L. Philip The School of Computer Science and Engineering South China University of Technology Guangzhou510006 China The Department of New Network Pengcheng Laboratory Shenzhen518000 China The China Tobacco Guangdong Industrial Corporation Guangzhou510385 China State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences Beijing100080 China

Semi-supervised semantic segmentation has witnessed remarkable advancements in recent years. However, existing algorithms are based on convolutional neural networks and directly applying them to Vision Transformers poses certain limitations due to conceptual disparities. To this end, we propose TokenMix, a data augmentation technique specifically designed for semi-supervised semantic segmentation with Vision Transformers. TokenMix aligns well with the global attention mechanism by mixing images at the token level, enhancing learning capability for contextual information among image patches. We further incorporate image augmentation and feature augmentation to promote the diversity of augmentation. Moreover, to enhance consistency regularization, we propose a dual-branch framework where each branch applies image and feature augmentation to the input image. We conduct extensive experiments across multiple benchmark datasets, including Pascal VOC 2012, Cityscapes, and COCO. Results suggest that the proposed method outperforms state-of-the-art algorithms with notably observed accuracy improvement, especially under limited fine annotations. Copyright © 2025, The Authors. All rights reserved.

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Simultaneous hydrogen production with photo reforming of lactic acid over MXene derived MoS_(2)/TiO_(2)/Ti_(3)C_(2)nanowires

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Chinese Journal of Catalysis 2025年第4期71卷 234-245页

作者： Seemal Mansoor Zixu Hu Yuxin Zhang Muhammad Tayyab Mazhar Khan Zeeshan Akmal Liang Zhou Juying Lei Muhammad Nasir Jinlong Zhang Key Laboratory for Advanced Materials Shanghai Engineering Research Center for Multi–media Environmental Catalysis and Resource UtilizationJoint International Research Laboratory of Precision Chemistry and Molecular EngineeringFeringa Nobel Prize Scientist Joint Research CenterSchool of Chemistry and Molecular EngineeringEast China University of Science&TechnologyShanghai 200237China National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical ProcessEast China University of Science and TechnologyShanghai 200237China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150090HeilongjiangChina Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China Institute of Materials Research Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055GuangdongChina COMSATS Univ Islamabad Interdisciplinary Res Ctr Biomed Mat IRCBMLahore CampusLahore 54000Pakistan

Developing efficient photocatalysts to address collaborative energy and environmental crises still faces significant *** this report,we present a highly efficient MXene–based photocatalyst,which is combined with MoS_(2)nano patches and TiO_(2)/Ti_(3)C_(2)(TTC)nanowires through hydrothermal *** all the composites tested,the optimized photocatalyst gave a remarkable H_(2)and revolving polylactic acid(PLA)into pyruvic acid(PA).Achieving a remarkable H_(2)evolution rate of 637.1 and 243.2μmol g^(−1)h^(−1),in the presence of TEOA and PLA as a sacrificial reagent under UV-vis(λ≥365 nm)light *** improved photocatalytic activity is a result of the combination of dual cocatalyst on the surface of TTC photocatalyst,which create an ideal synergistic effect for the generation of PA and the production of H_(2)*** MoS_(2)TiO_(2)/Ti_(3)C_(2)(MTT)composite can generate more photoexcited charge carriers,leading to the generation of more active radicals,which may enhance the system's photocatalytic *** work aims at demonstrating its future significance and guide the scientific community towards a more efficient approach to commercializing H_(2)through photocatalysis.

关键词： Photo reforming Polylactic acid Hydrogen evolution Lactic acid Pyruvic acid

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SMNet: Multi-Drone Detection and Classification via Monitoring Flight control Signals on Spectrograms

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IEEE Transactions on Cognitive Communications and Networking 2025年

作者： Yu, Ningning Wu, Jiajun Zhou, Chengwei Shi, Zhiguo Chen, Jiming Zhejiang University College of Information Science and Electronic Engineering Hangzhou310027 China Jinhua Institute Zhejiang University Jinhua321037 China Zhejiang University State Key Laboratory of Industrial Control Technology Hangzhou310027 China Hangzhou Dianzi University School of Artificial Intelligence Hangzhou310018 China

The widespread use of drones has provided numerous benefits, but it has also raised critical concerns regarding public safety and personal privacy due to many accidents stemming from their illegal use. Most radio frequency (RF) based methods for drone monitoring focus on the video-transmission signals (VTS), therefore bringing the potential risks that illicit drones can evade RF monitoring systems by disabling their VTS. To address this problem, we shift our attention to the flight control signals (FCS) that are indispensable for carrying the routine flight control instructions and logs. This paper proposes a new network designed specifically for FCS-oriented detection and classification, named the Spectrogram Monitoring Network (SMNet). Specifically, SMNet can identify the classes, frequency ranges, and time ranges of FCS by monitoring objects of interest on spectrograms. Different from traditional detectors, SMNet exploits the edge and corner features of FCS, which makes it perform well in complex electromagnetic environments. Then, we leverage our insights into texture features (TF) and position features (PF) found within FCS. By integrating TF-aware and PF-aware mechanisms, SMNet can effectively extract weak and scattered features of FCS to improve accuracy. Besides, we explore the application of SMNet to deal with multi-drone scenarios with a scale-limited dataset, which aims to reduce the demanded scale of data acquisition and labelling from the exponential level to the linear level. To this end, we utilize mixup-based data augmentation to generate pseudo-spectrograms that reflect multi-drone communication activities, thereby enhancing the generalizability of SMNet. Extensive experiments show that the proposed method outperforms the compared methods in terms of robustness against six typical types of noise while maintaining similar precision and recall. © 2015 IEEE.

关键词： Spectrographs

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Explicit Hybrid Model Predictive control of the Forward DC-DC Converter

Explicit Hybrid Model Predictive Control of the Forward DC-D...

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第25届中国控制与决策会议

作者： Yeye Shen Lei Xie Xiuliang Li State Key Laboratory of Industrial Control Technology Institute of Cyber-Systems and Control Zhejiang University

ISBN: (纸本)9781467355339

This paper presents an explicit model predictive control approach for a forward dc-dc converter. The objective of the proposed control algorithm is to regulate the output voltage in the case of load variations. We first develop a signal averaged model for the forward dc-dc converter, and then extend it to a hybrid model. The related optimal control problem is presolved offline to construct a lookup table, and the controller searches for the control law online, thus avoiding any online optimization. An additional control loop is proposed to deal with the problem of load and source voltage variations.

关键词： Explicit MPC, Forward dc-dc converter, Hybrid modeling

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A Second-Order Sliding Mode control Design for Bidirectional DCDC Converter 36

A Second-Order Sliding Mode Control Design for Bidirectional...

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第36届中国控制会议

作者： SONG Jian LIU Zhitao SU Hongye State Key Laboratory of Industrial Control Technology Institute of Cyber-Systems and ControlZhejiang University

ISBN: (纸本)9781538629185

In this paper,a second-order sliding mode control based on super-twisting algorithm is applied for bidirectional DCDC *** sliding mode controllers are given for buck mode and boost mode of the DCDC converter,and they can be switched to achieve the voltage/current output regulation according to the different working conditions of DCDC *** working conditions of DCDC converter with the sliding mode controller are simulated in *** comparing with PID,the simulation results show that the proposed second order sliding mode control for the bidirectional DCDC converter has better performance and robustness.

关键词： Bidirectional DCDC converter second-order sliding-mode control Super-Twisting algorithm

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control Lyapunov Function Based control Strategy for Air Supply System of PEM Fuel Cells 29

Control Lyapunov Function Based Control Strategy for Air Sup...

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第29届中国控制与决策会议

作者： Rong Yang Zhitao Liu Hongye Su State Key Laboratory of Industrial Control Technology Institute of Cyber-Systems and ControlZhejiang University

ISBN: (纸本)9781509046584

In order to achieve the desired net power sufficiently and rapidly,a control strategy based on control Lyapimov function is proposed to regulate the oxygen from the air supply system of PEM Fuel cells in this *** on the popular nonlinear air supply model,exponential stability can be obtained by the proposed control ***,the convergence speed can also be tuned by the parameters in a ***,the performance of the proposed strategy is shown bv the simulation results.

关键词： PEM fuel cell Air Supply System control Lyapunov Function Nonlinear control Exponentially Stable

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Adaptive Sliding Mode Sensorless Vector control of Induction Motor Using Sliding Mode MRAS Observer 36

Adaptive Sliding Mode Sensorless Vector Control of Induction...

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第36届中国控制会议

作者： Shuiyun Wu Zhitao Liu Hongye Su State Key Laboratory of Industrial Control Technology Institute of Cyber-Systems and ControlZhejiang University

ISBN: (纸本)9781538629185

This paper deals with sensorless vector control of induction motor(IM) based on model reference adaptive system(MRAS) theory and sliding mode *** adaptive-gain supertwisting(ASTW) sliding mode speed controller is designed to provide good speed tracking performance in the presence of load torque variation.A stator current and rotor flux sliding mode observer(SMO) is designed,which is insensitive to model uncertainties and parameter *** replacing the reference voltage model of conventional MARS with the SMO,the rotor speed can be estimated more precisely and improve the control *** proposed drive system is simulated using MATLAB/SIMULINK to verify the effectiveness and robustness.

关键词： Induction motor Adaptive sliding mode control Sliding mode observer vector control MRAS

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System Identification and Model Predictive control of Vortex Shedding Behind a Rotating Cylinder 35

System Identification and Model Predictive Control of Vortex...

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第35届中国控制会议

作者： CAI Shengze XU Chao State Key Laboratory of Industrial Control Technology and the Institute of Cyber-Systems & Control Zhejiang University

ISBN: (纸本)9781509009107

In this paper we present an approach for modeling and control of the unsteady flow over a circular cylinder at a low Reynolds number(Re = 60).Actuation is achieved by rotating the cylinder and the measured variable is the vertical velocity at a specific point of the center line behind the *** of using the Navier-Stokes equation(NSE) for control synthesis,a linear ARMAX(Auto Regressive Moving Average with exogenous inputs) model for this flow system is derived by a system identification method based on input-output data sequences,which are collected from the computational fluid dynamics(CFD) software *** models identified for Reynolds number Re = 40 and Re = 60 both fit the flow dynamics with an acceptable *** when the Reynolds number varies over a small range,the linear models still work,since the changes are considered as an external disturbance for the identified *** model validation,a model predictive controller is designed to suppress the actual vortex *** closed-loop control procedure is implemented using collaborative simulation between MATLAB and FLUENT,and the results show that the proposed control strategy can effectively reduce oscillations in vortex wakes.

关键词： System identification Model Predictive control Flow control Vortex Shedding

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