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SSRN 2024年

作者： Wu, Yixi Wang, Ziqi Shi, Chenli Jin, Xiaohang Xu, Zhengguo State Key Laboratory of Industrial Control Technology College of Control Science and Engineering Zhejiang University Hangzhou310027 China Huzhou Institute Zhejiang University Huzhou313000 China College of Mechanical Engineering Zhejiang University of Technology Hangzhou310023 China Key Laboratory of Special Purpose Equipment and Advanced Processing Technology Ministry of Education Zhejiang University of Technology Zhejiang Province Hangzhou310023 China

The cost of coal and environmental protection make coal-fired power plants focus on energy conservation and emission reduction in the boiler's combustion process. And in the context of carbon neutrality, the modeling and optimization of combustion process has become more difficult in order to adapt to the wide-load and variable-load operating requirements under deep peak shaving. To address the raised difficulties, this study proposed a data-driven approach for boiler combustion modeling, model tuning and optimization under wide-load and variable-load operating requirements. The proposed approach was experimented on an ultra-supercritical coal-fired boiler with targets of NOx concentration and air pre-heater's temperature, and its superiority was verified. To face the high requirements for model's learning and generalization ability brought considering wide-variable loads, a Gaussian kernel and LSTM based neural network model can capture the work conditions and temporal information was proposed and achieved accurate prediction with comprehensive historical data for training on experimented boiler. To solve the issue of incomplete coverage of historical training data under deep peak shaving, a fine-tuning framework was added and completed the rapid model tuning to adapt to the new steady-state work condition using a small amount of data in experiments. (See text for full abstract.) © 2024, The Authors. All rights reserved.

关键词： Coal fired boilers

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On a Small Phase Theorem with Necessity over Phase Bounded Nonlinear Uncertainties⋆

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IFAC-PapersOnLine 2023年第2期56卷 1877-1882页

作者： Xiaokan Yang Dan Wang Wei Chen Department of Mechanics and Engineering Science Peking University Beijing 100871 China Division of Decision and Control Systems KTH Royal Institute of Technology Stockholm Sweden State Key Laboratory for Turbulence and Complex Systems Peking University Beijing 100871 China

In this paper, we consider the feedback interconnection of a linear time-invariant (LTI) system and phase bounded uncertainties that are possibly nonlinear and/or time-varying. We devise a small phase condition and show that it is necessary and sufficient for robust stability over such phase bounded uncertainties, in a similar spirit to the well-known small gain condition being necessary and sufficient for robust stability over norm bounded uncertainties. Moreover, we show that the small phase condition can be verified using a state space characterization via linear matrix inequalities (LMIs), which extends the sectored real lemma in previous work.

关键词： Small phase theorem robust stability cone of phase bounded uncertainties

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Optimal synchronization control formulti-agent systems with input saturation:a nonzero-sum game

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Frontiers of Information technology & Electronic Engineering 2022年第7期23卷 1010-1019页

作者： Hongyang LI Qinglai WEI School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100049China The State Key Laboratory for Management and Control of Complex Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China Institute of Systems Engineering Macao University of Science and TechnologyMacao 999078China

This paper presents a novel optimal synchronization control method for multi-agent systems with input *** multi-agent game theory is introduced to transform the optimal synchronization control problem into a multi-agent nonzero-sum ***,the Nash equilibrium can be achieved by solving the coupled Hamilton–Jacobi–Bellman(HJB)equations with nonquadratic input energy terms.A novel off-policy reinforcement learning method is presented to obtain the Nash equilibrium solution without the system models,and the critic neural networks(NNs)and actor NNs are introduced to implement the presented *** analysis is provided,which shows that the iterative control laws converge to the Nash *** results show the good performance of the presented method.

关键词： Optimal synchronization control Multi-agent systems Nonzero-sum game Adaptive dynamic programming Input saturation Off-policy reinforcement learning Policy iteration

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Quantum Approximate Optimization Algorithm in Non-Markovian Quantum systems

arXiv

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arXiv 2022年

作者： Yue, Bo Xue, Shibei Pan, Yu Jiang, Min Department of Automation Shanghai Jiao Tong University The Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai200240 China State Key Laboratory of Industrial Control Technology Institute of Cyber-Systems and Control College of Control Science and Engineering Zhejiang University Hangzhou310027 China School of Electronics and Information Engineering Soochow University Suzhou215006 China

Although quantum approximate optimization algorithm (QAOA) has demonstrated its quantum supremacy, its performance on Noisy Intermediate-Scale Quantum (NISQ) devices would be influenced by complicated noises, e.g., quantum colored noises. To evaluate the performance of QAOA under these noises, this paper presents a framework for running QAOA on non-Markovian quantum systems which are represented by an augmented system model. In this model, a non-Markovian environment carrying quantum colored noises is modelled as an ancillary system driven by quantum white noises which is directly coupled to the corresponding principal system;i.e., the computational unit for the algorithm. With this model, we mathematically formulate QAOA as piecewise Hamiltonian control of the augmented system, where we also optimize the control depth to fit into the circuit depth of current quantum devices. For efficient simulation of QAOA in non-Markovian quantum systems, a boosted algorithm using quantum trajectory is further presented. Finally, we show that non-Markovianity can be utilized as a quantum resource to achieve a relatively good performance of QAOA, which is characterized by our proposed exploration rate. Copyright © 2022, The Authors. All rights reserved.

关键词： White noise

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Consistent and Asymptotically Efficient Localization from Range-Difference Measurements

arXiv

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arXiv 2023年

作者： Zeng, Guangyang Mu, Biqiang Shi, Ling Chen, Jiming Wu, Junfeng The School of Data Science Chinese University of Hong Kong Shenzhen Shenzhen China The Department of Automation University of Science and Technology of China Hefei China Key Laboratory of Systems and Control Institute of Systems Science Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing100190 China The Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Hong Kong The College of Control Science and Engineering The State Key Laboratory of Industrial Control Technology Zhejiang University Hangzhou310027 China

We consider signal source localization from range-difference measurements. First, we give some readily-checked conditions on measurement noises and sensor deployment to guarantee the asymptotic identifiability of the model and show the consistency and asymptotic normality of the maximum likelihood (ML) estimator. Then, we devise an estimator that owns the same asymptotic property as the ML one. Specifically, we prove that the negative log-likelihood function converges to a function, which has a unique minimum and positive definite Hessian at the true source's position. Hence, it is promising to execute local iterations, e.g., the Gauss-Newton (GN) algorithm, following a consistent estimate. The main issue involved is obtaining a preliminary consistent estimate. To this aim, we construct a linear least-squares problem via algebraic operation and constraint relaxation and obtain a closed-form solution. We then focus on deriving and eliminating the bias of the linear least-squares estimator, which yields an asymptotically unbiased (thus consistent) estimate. Noting that the bias is a function of the noise variance, we further devise a consistent noise variance estimator that involves 3-order polynomial rooting. Based on the preliminary consistent location estimate, a one-step GN iteration suffices to achieve the same asymptotic property as the ML estimator. Simulation results demonstrate the superiority of our proposed algorithm in the large sample case. Copyright © 2023, The Authors. All rights reserved.

关键词： Iterative methods

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LCA-based Multi-scenario Study on Steel or Aluminum Wheel Hub for Passenger Vehicles

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Procedia CIRP 2023年 116卷 191-196页

作者： Lu Gao Zhihui Wang Yanan Wang Tao Peng Weipeng Liu Renzhong Tang State Laboratory of Fluid Power and Mechatronic Systems School of Mechanical Engineering Zhejiang University Hangzhou 310058 China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province Zhejiang University Hangzhou 310058 China State Key Laboratory of Industrial Control Technology College of Control Science and Engineering Zhejiang University Hangzhou 310058 China School of Engineering Zhejiang University City College Hangzhou 310015 China

Lightweighting is one of the enabling techniques for energy saving and carbon reduction in the automotive industry. However, the life cycle performance of lightweight components remains unclear. Wheel hub is an important component, and its trend of replacing steel with aluminum is happening. Based on life cycle assessment and using ReCiPe model, this paper reports a cradle-to-grave study on the environmental impact of steel and aluminum wheel hub in passenger vehicles. Considering multi-scenario in the Chinese market, it is found that when the service life of passenger vehicle is less than 5.6 years, steel wheel hub is more environmental-friendly, and when the service life is less than 8.6 years, steel wheel hub also has more economic advantages. Combining different lightweight methods and different types of vehicles, it is found that structural optimization reduces the environmental impact of per unit weight mostly, process optimization reduces the life cycle environmental impact of wheel hub, and using lightweight steel wheel hub in electric vehicles has more potential in environmental benefits. some suggestions are, 1) to choose wheel hub that matches your actual usage to enjoy more environmental-economic advantages; 2) to prioritize structural-process integrated optimization for lightweight wheel hub; and 3) to use more lightweight components in electric vehicles.

关键词： Life cycle assessment Steel wheel hub Aluminum wheel hub Lightweight methods Scenario study

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Serrated chip formation in machining of difficult to cut metallic materials: a comprehensive review

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Critical Reviews in Solid state and Materials Sciences 2025年

作者： Zhao, Zejia Liu, Chujun Xu, Bo Wang, Jingwei Yao, Yingxue Yin, Tengfei To, Suet Yang, Yang Institute of Semiconductor Manufacturing Research College of Mechatronics and Control Engineering Shenzhen University Shenzhen China State Key Laboratory of Ultra-precision Machining Technology Department of Industrial and Systems Engineering The Hong Kong Polytechnic University Kowloon Hong Kong Department of Materials Science Shenzhen MSU-BIT University Shenzhen China Shenzhen China

Serrated cutting chips are usually observed in the machining of difficult to cut metallic materials such as titanium alloys, steels, and nickel-based alloys. Understanding the formation mechanism and influencing factors to generate serrated chips is meaningful for improving the machinability of the difficult to cut materials since the formation of serrated chips poses high risks on the vibration of cutting tools and further affects the surface quality of the workpiece. To date, extensive studies have been conducted on the investigation of serrated chip formation in the machining of difficult to cut materials, but there is still a lack of a comprehensive review to clarify the formation mechanism and summarize the factors affecting the serrated chip characteristics. In this review, two commonly used mechanisms, i.e., adiabatic shear band (ASB) theory and periodical crack formation (PCF) theory, are summarized and discussed with respect to theoretical analyses and experimental verifications. Serrated chip formation in different difficult to cut alloys was also systematically reviewed, considering materials inherent properties such as high hardness, poor thermal conductivity, or low fracture toughness. Besides, some critical factors, including cutting speeds, feed rates, cutting tools, external energy sources, humidity, and temperature are highlighted to illustrate their effects on the serrated chip formation. In addition, challenges and perspectives about the serrated chip formation in machining of difficult to cut metallic materials are proposed to give instruction to future research. © 2025 Taylor & Francis Group, LLC.

关键词： Titanium alloys

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Gate oxide degradation of SiC IGBT induced by non-constant thermal-electrical coupled stresses

Gate oxide degradation of SiC IGBT induced by non-constant t...

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2023 International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, PCIM Asia 2023

作者： Luo, Rongde Yang, Shaodong Luo, Xia Niu, Hao Kuang, Xianjun Xu, Xiaowei Dong, Huafeng Dai, Zongbei Wu, Fugen State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment Guangdong University of Technology Guangzhou510006 China School of Materials and Energy Guangdong University of Technology Guangzhou510006 China No.5 Electronics Research Institute of the Ministry of Industry and Information Technology Guangzhou511370 China Three Gorges Intelligent Industrial Control Technology Company Wuhan430070 China School of Physics and Optoelectronic Engineering Guangdong University of Technology Guangzhou510006 China

ISBN: (纸本)9783800761326

The SiC/SiO2interface property has become a non-negligible reliability risk for SiC power electronic devices. The degradation mechanism of the SiC/SiO2interface of SiC IGBTs under non-constant thermal-electrical coupled stresses was investigated in this study, based on variation analysis of sensitive static characteristics. Under positive bias (Group 2: +70 V, Group 3: +50 V) at 150 °C for 675 h, VGE(TH)increased slightly. Then a mild rebound happened to Groups 2 and 3 after 15 days of recovery (Stage 2: under 25 °C / 50 %RH). Afterwards, a significant decrease of VGE(TH)within 48 h under negative bias (Group 2: -70 V, Group 3: -50 V), probably due to the holes captured by traps rapidly at or near the SiC/SiO2interface. The harsher stresses led to more serious VGE(TH)drift as expected. While no significant VGE(TH) fluctuations were observed after HTSS tests (at 150°C). Besides, the IGESand V(BR)CESdid not change significantly, which indicates there is no permanent damage. © VDE VERLAG GMBH - Berlin - Offenbach.

关键词： Silicon carbide

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Trajectory Optimization for 3D Shape-Changing Robots with Differential Mobile Base

Trajectory Optimization for 3D Shape-Changing Robots with Di...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Mengke Zhang Chao Xu Fei Gao Yanjun Cao The State Key Laboratory of Industrial Control Technology College of Control Science and Engineering Zhejiang University Hangzhou China Huzhou Institute Zhejiang University Huzhou China Yunjing Intelligent (Shenzhen) Co. Ltd Shenzhen China

Service robots have attracted extensive attention due to specially designed functions, such as mobile manipulators or robots with extra structures. For robots that have changing shapes, autonomous navigation in the real world presents new challenges. In this paper, we propose a trajectory optimization method for differential-drive mobile robots with controllable changing shapes in dense 3D environments. We model the whole-body trajectory as a polynomial trajectory that satisfies the nonholonomic dynamics of the base and dynamics of the extra joints. These constraints are converted into soft constraints, and an activation function for dense sampling is applied to avoid nonlinear mutations. In addition, we guarantee the safety of full shape by limiting the system's distance from obstacles. To comprehensively simulate a large extent of height and width changes, we designed a novel Shape-Changing Robot with a Differential Base (SCR-DB). Our global trajectory optimization gives a smooth and collision-free trajectory for SCR-DB at a low computational cost. We present vast simulations and real-world experiments to validate our performance, including coupled whole-body and independent differential-driven vehicle motion planning.

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Dynamic collision avoidance for cooperative fixed-wing UAV swarm based on normalized artificial potential field optimization

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Journal of Central South University 2021年第10期28卷 3159-3172页

作者： LIU Wei-heng ZHENG Xin DENG Zhi-hong State Key Laboratory of Intelligent Control and Decision of Complex Systems School of AutomationBeijing Institute of TechnologyBeijing 100081China China Aerospace Science and Industrial Corporation Beijing 100048China

Cooperative path planning is an important area in fixed-wing UAV ***,avoiding multiple timevarying obstacles and avoiding local optimum are two challenges for existing approaches in a dynamic ***,a normalized artificial potential field optimization is proposed by reconstructing a novel function with anisotropy in each dimension,which can make the flight speed of a fixed UAV swarm independent of the repulsive/attractive gain coefficient and avoid trapping into local optimization and local ***,taking into account minimum velocity and turning angular velocity of fixed-wing UAV swarm,a strategy of decomposing target vector to avoid moving obstacles and pop-up threats is ***,several simulations are carried out to illustrate superiority and effectiveness.

关键词： fixed-wing UAV swarm cooperative path planning normalized artificial potential field dynamic obstacle avoidance local optimization

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