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SSRN 2022年

作者： Hu, Chen-Yan Xu, Ling Lin, Yi-Li Wang, Qiang-Bing Huang, Dan-Dan Wu, Yi-Hui Dong, Zi-Yi Ji, Sheng-Jie College of Environmental and Chemical Engineering Shanghai Engineering Research Center of Energy- Saving in Heat Exchange Systems Shanghai University of Electric Power Shanghai200090 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China Department of Safety Health and Environmental Engineering National Kaohsiung University of Science and Technology Kaohsiung824 Taiwan

Prometryn is one of the commonly used triazine herbicides and is also widely used for the removal of algae in aquaculture. This work studied the degradation kinetics of prometryn by UV/persulfate (PS) oxidation and confirmed that it follows the pseudo-first-order kinetics, with the rate constant (kobs) being calculated as 0.2339 min-1. The effects of PS concentration, water matrix (background ions of Cl- and Br- and natural organic matter), and solution pH on prometryn degradation were assessed. It was found that the degradation rate of prometryn enhanced with increasing concentrations of PS, Cl-, and Br- but decreased with increasing NOM concentration and pH. Radical scavenging experiments confimed that both HO• and SO4-• promoted prometryn degradation in UV/PS, but SO4-• promoted it more significantly. When Br- is present in water, it can lead to the the formation of brominated disinfection by-products (DBPs), which are more carcinogenic and mutagenic than their chlorinated analogous. In sum, UV/PS process can effectively degrade prometryn but the generation of DBPs should be carefully controlled. © 2022, The Authors. All rights reserved.

关键词： Kinetics

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Parallel-triggered observer-based output feedback stabilization of linear systems ⁎

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IFAC-PapersOnLine 2020年第2期53卷 4428-4433页

作者： Zhiying Wu Wei Ren Junlin Xiong Min Xie Department of Automation University of Science and Technology of China Hefei 230026 China Decision and Control Systems EECS KTH Royal Institute of Technology Stockholm Sweden Department of Systems Engineering and Engineering Management City University of Hong Kong Kowloon Hong Kong

Based on the parallel-triggered scheme, the stabilization problem is investigated for linear systems. By utilizing both the absolute and relative errors, a continuous parallel-triggered scheme is proposed. The proposed scheme reduces the number of data transmissions as well as maintains control performance. Under the proposed scheme, Zeno behavior can be excluded. Then, by using Lyapunov theory, sufficient criteria are established for the existence of state feedback controller and the observer-based controller. Next, a co-design approach is provided to obtain both weighting matrix of the triggered scheme and the gain of controller. Finally, the superiority of the proposed scheme is demonstrated by a numerical example.

关键词： Co-design event-triggered scheme observer stabilization

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A Survey of Robot Manipulation in Contact

arXiv

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arXiv 2021年

作者： Suomalainen, Markku Karayiannidis, Yiannis Kyrki, Ville Center of Ubiquitous Computing Faculty of Information Technology and Electrical Engineering University of Oulu Finland Systems and Control Department of Electrical Engineering Chalmers University of Technology Gothenburg Sweden Intelligent Robotics research group Department of Electrical Engineering and Automation School of Electrical Engineering Aalto University Helsinki Finland

In this survey, we present the current status on robots performing manipulation tasks that require varying contact with the environment, such that the robot must either implicitly or explicitly control the contact force with the environment to complete the task. Robots can perform more and more manipulation tasks that are still done by humans, and there is a growing number of publications on the topics of 1) performing tasks that always require contact and 2) mitigating uncertainty by leveraging the environment in tasks that, under perfect information, could be performed without contact. The recent trends have seen robots perform tasks earlier left for humans, such as massage, and in the classical tasks, such as peg-in-hole, there is a more efficient generalization to other similar tasks, better error tolerance, and faster planning or learning of the tasks. Thus, in this survey we cover the current stage of robots performing such tasks, starting from surveying all the different in-contact tasks robots can perform, observing how these tasks are controlled and represented, and finally presenting the learning and planning of the skills required to complete these tasks. © 2021, CC BY.

关键词： Surveys

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Event-triggered Discrete-time Sliding Mode control for High-order systems via Reduced-order Model Approach

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IFAC-PapersOnLine 2020年第2期53卷 6207-6212页

作者： Kiran Kumari Bijnan Bandyopadhyay Johann Reger Abhisek K. Behera Systems and Control Engineering Indian Institute of Technology Bombay India Control Engineering Group Technische Universität Ilmenau 98684 Ilmenau Germany Faculty of Mechanical Engineering Technion-Israel Institute of Technology Haifa 32000 Israel Department of Statistics University of Haifa Haifa 31905 Israel

We propose the design of event-triggered (ET) discrete-time sliding mode (DTSM) control for a high-order discrete-time system via a reduced-order model-based approach. This design includes a triggering mechanism using a reduced-order state vector and a controller based on the modified Bartoszewicz’ reaching law for a reduced-order model of the system, to stabilize the uncertain high-order system. The main advantages of using a reduced-order vector in the event condition are the low-order synthesis of the controller and the sampling pattern, which may be sparser than the full vector-based design. This motivation arises from the fact that relaxing a few components of the state vector in the triggering mechanism may decrease its rate of violation. An added advantage of the proposal is that the transmission of the reduced-order vector, particularly in a network-based implementation, can outperform the full-order based design due to the severe challenges that exist in the data network. The robust performance for the closed-loop system is achieved using the DTSM control. We show that our proposal guarantees the stability of the full-order plant with the reduced-order triggering mechanism. The control execution is Zeno-free because of the inherent discrete nature of the control. The efficiency of the proposed method is shown using the simulation results of a numerical example.

关键词： Event-triggered control Discrete-time sliding mode Model-order reduction

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H∞$$ {H}_{\infty } $$optimal output tracking control for Markov jump systems: A reinforcement learning-based approach

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International Journal of Robust and Nonlinear control 2024年第8期34卷

作者： Ying Shen Cai-Kang Yao Bo Chen Wei-Wei Che Zheng-Guang Wu Department of Automation Zhejiang University of Technology Hangzhou People's Republic of China Zhejiang Provincial United Key Laboratory of Embedded Systems Zhejiang University of Technology Hangzhou People's Republic of China Institute of Complexity Science and the Shandong Key Laboratory of Industrial Control Technology Qingdao University Qingdao People's Republic of China State Key Laboratory of Industrial Control Technology Zhejiang University Hangzhou People's Republic of China

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Comparison of exact and approximate MHD slow body mode solutions in photospheric waveguides

arXiv

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arXiv 2022年

作者： Aldhafeeri, Anwar A. Verth, Gary Fedun, Viktor Lennard, Matthew Ballai, Istvan Mathematics and Statistic Department Faculty of Science King Faisal University Al-Hassa P.O. Box 400 Hofuf31982 Saudi Arabia Plasma Dynamics Group School of Mathematics and Statistics University of Sheffield Hicks Building Hounsfield Road SheffieldS3 7RH United Kingdom Plasma Dynamics Group Department of Automatic Control and Systems Engineering The University of Sheffield Mappin Street SheffieldS1 3JD United Kingdom

In this study we explore the possibility of simplifying the modeling of magnetohydrodynamic (MHD) slow body modes observed in photospheric magnetic structure such as the umbrae of sunspots and pores. The simplifying approach assumes that the variation of the eigenvalues of slow body waves can be derived by imposing that the longitudinal component of velocity with respect to the tube axis is zero at the boundary of the magnetic flux tube, which is in a good agreement with observations. To justify our approach we compare the results of our simplified model for slow body modes in cylindrical flux tubes with the model prediction obtained by imposing the continuity of the radial component of the velocity and total pressure at the boundary of the flux tube. Our results show that, to a high accuracy (less than 1% for the considered model), the conditions of continuity of the component of transversal velocity and pressure at the boundary can be neglected when modelling slow body modes under photospheric conditions. © 2022, CC BY.

关键词： Magnetohydrodynamics

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Two TS-Fuzzy controllers based Direct Torque control of 5-Phase Induction Motor

Two TS-Fuzzy Controllers based Direct Torque Control of 5-Ph...

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International Conference on Power Electronic Drives

作者： Malik G. Al-Ghanimi Omar Hanif Mahit V. Jain A. Siva Kumar Ramana Rao M. V R. Kavin Siva Ganesh Malla Jagan Mohana Rao Malla Md. Amzad Hossain Technical institute of Al-Mussaib Al-Furat Al-Awsat Technical University Iraq Dept. of Automatic Control and Systems Engineering The University of Sheffield Sheffield The United Kingdom Sigma Institute of Engineering Vadodara India Department of EEE Panimalar Engineering College Chennai Tamilnadu India University College of Engineering Osmania University Hyderabad India Sri Krishna College of Engineering & Technology Coimbatore India CPGC Pvt. Ltd. Visakhapatnam India Geethanjali College of Engineering and Technology Hyderabad Telangana India Institute of Theoretical Electrical Engineering Ruhr University Bochum (RUB) Germany

The interest on five phase induction motor drives is gradually increasing due to its wide variety of applications including electric vehicles, high compressor systems, ship propulsion etc. The designing of a proper controller to make 5-phase induction motor based electric drive is playing a vital role for many usages among many controllers, a direct torque controller (DTC) is a famous technique to achieve motor torque with fewer ripples. Moreover, Takagi Suguno - Fuzzy (TS-Fuzzy) controllers can provide fast response under rapid changes of inputs. Therefore, TS-Fuzzy based DTC of 5-phase induction motor drive is proposed in this paper. Further, the space vector modulation technique is implemented for obtaining proper pulse sequence for 5-phase inverter to drive the motor. In order to achieve smooth control of both torque and flux, two fuzzy logic controllers are deployed on the DTC of the motor. For better illustration, responses of the proposed TS-Fuzzy based DTC of 5-phase induction motor are compared with 3-phase motor. The proposed method is simulated and presented in this paper to analyze the performance of the proposed method under various conditions.

关键词： Induction motor drives Support vector machines Fuzzy logic Torque Torque control Modulation Switches

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Exploratory Visual Analytics for the European Single Intra-Day Coupled Electricity Market

Exploratory Visual Analytics for the European Single Intra-D...

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International Conference on Smart Energy systems and Technologies (SEST)

作者： Sumeyra Demir Koen Kok Nikolaos G. Paterakis Department of Electrical Engineering Eindhoven University of Technology Eindhoven The Netherlands Monitoring & Control Systems Group TNO Groningen The Netherlands

ISBN: (数字)9781728147017

ISBN: (纸本)9781728147024

European single intra-day coupled electricity market (SIDC) trading activity has increased substantially in recent years mainly as a consequence of the increasing penetration of renewable energy production and its subsequent impact on imbalance market prices. Nonetheless, more research is needed to understand this growing market. This paper presents exploratory visual analytics tools for tradable contracts of the SIDC. The main visualisations are created from order and trade books and intended to increase our domain knowledge of the SIDC by monitoring market trends, behaviours, depth, price consensus and liquidity. Furthermore, previous contracts of SIDC volumes and balancing prices are visualised to identify trading opportunities and risks. We expect that the presented visual analytics will be useful for both practitioners and researchers seeking quick and easily implementable tools for acquiring additional market insights and developing manual or automated trading strategies.

关键词： Contracts Tools Renewable energy sources Production Visual analytics Europe

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Urban trip generation forecasting based on gradient boosting algorithm 1

Urban trip generation forecasting based on gradient boosting...

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1st IEEE International Conference on Digital Twins and Parallel Intelligence, DTPI 2021

作者： Li, Zhishuai Xiong, Gang Zhang, Yu Zheng, Meng Dong, Xisong Lv, Yisheng Institute of Automation Chinese Academy of Sciences State Key Laboratory for Management and Control of Complex Systems Beijing China School of Artificial Intelligence University of Chinese Academy of Sciences Beijing China Beijing Engineering Research Center of Intelligent Systems and Technology Institute of Automation Chinese Academy of Sciences Beijing China Guangdong Engineering Research Center of 3D Printing and Intelligent Manufacturing Cloud Computing Center Chinese Academy of Sciences Dongguan China Beijing Municipal Institute of City Planning and Design Traffic Planning Department Beijing China

ISBN: (纸本)9781665433372

The four-step transportation model plays an important role in urban planning. The quality of the first phase, i.e. trip generation, determines the performance of the global course. The majority of trip generation forecasting models highly rely on mathematical derivation and have many predictor variables during the prediction, which leads to low accuracy of results and requires laboriously hand-crafted design of input vectors. This paper is the first to introduce the gradient boosting decision tree (GBDT) algorithm for trip generation prediction, and harmonizes such a powerful machine learning method with traditional urban planning requirements to achieve better prediction performance. Unlike the commonly used linear regression method, GBDT can automatically perform feature selection and model the non-linear relationships between input and output variables. Experimental results on real-world residential travel census in Beijing prove that the GBDT model significantly outperforms the baseline and can forecast the trip generation more accurately. © 2021 IEEE.

关键词： Decision trees

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Input-to-state stability and Lyapunov functions with explicit domains for SIR model of infectious diseases∗

arXiv

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arXiv 2020年

作者： Hiroshi, I.T.O. Department of Intelligent and Control Systems Kyushu Institute of Technology 680-4 Kawazu Iizuka Fukuoka820-8502 Japan

This paper demonstrates input-to-state stability (ISS) of the SIR model of infectious diseases with respect to the disease-free equilibrium and the endemic equilibrium. Lyapunov functions are constructed to verify that both equilibria are individually robust with respect to perturbation of newborn/immigration rate which determines the eventual state of populations in epidemics. The construction and analysis are geometric and global in the space of the populations. In addition to the establishment of ISS, this paper shows how explicitly the constructed level sets reflect the flow of trajectories. Essential obstacles and keys for the construction of Lyapunov functions are elucidated. The proposed Lyapunov functions which have strictly negative derivative allow us to not only establish ISS, but also get rid of the use of LaSalle’s invariance principle and popular simplifying *** Codes 93D30, 93C10, 93D09, 92D25, 34D23 Copyright © 2020, The Authors. All rights reserved.

关键词： Ordinary differential equations

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