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检索条件"机构=Key Lab. of Industrial Computer Control Engineering"

共 401 条记录，以下是41-50 订阅

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An Improved Seagull Optimization Algorithm for Flexible Job-shop Scheduling Problem 13

An Improved Seagull Optimization Algorithm for Flexible Job-...

引用

13th IEEE International Conference on CYBER Technology in Automation, control, and Intelligent Systems, CYBER 2023

作者： Ma, Kai Yao, Shijie Guo, Shiliang Yang, Bin Li, Shuai Yanshan University Key Lab of Industrial Computer Control Engineering of Hebei Province Qinhuangdao China

ISBN: (纸本)9798350315196

Job-shop scheduling problem is the core link and key technology to realize smart factory and develop smart manufacturing technology. Among them, the flexible job-shop scheduling problem (FJSP) which is more consistent with the actual production and processing mode has been focused. This paper proposes an improved seagull optimization algorithm(ISOA) for solving the FJSP. The ISOA uses chaos initialization and reverse learning to optimize initial population, and introduces Q-learning to change the fitting parameters to balance global search and local search. In addition, we propose a local search model that is adaptive iterative process to enhance the algorithm's optimization search capability. The results of the experiment proved that the algorithm is superior in terms of optimization speed and scheduling results. © 2023 IEEE.

关键词： Iterative methods

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Relaxed Stability Analysis and Event-Triggered controller Design for Discrete-Time Positive T-S Fuzzy Networked control Systems 49

Relaxed Stability Analysis and Event-Triggered Controller De...

引用

49th Annual Conference of the IEEE industrial Electronics Society, IECON 2023

作者： Wang, Xiaoxiao Li, Xiaomiao Bao, Zhiyong Liu, Fucai Du, Yuehao Yanshan University Key Lab of Industrial Computer Control Engineering of Hebei Province Qinhuangdao China

ISBN: (纸本)9798350331820

This paper deals with the relaxation stability analysis and event-triggered controller design of discrete-time positive Takagi-Sugeno (T-S) fuzzy networked control systems (FNCSs). The constraints of positive conditions in NCSs bring significant challenges to stability analysis and controller design. A 1-norm event-triggered scheme is proposed for the positive system, which can effectively reduce the frequency of network communication. Since the event-triggered T-S fuzzy controller (ETTSFC) can only observe the latest transmission state after the triggering action, the ETTSFC selects the premise variables different from the T-S fuzzy model, improving design and implementation flexibility. Using the linear copositive Lyapunov function (LCLF), the design criteria of the event-triggered controller to ensure the positivity and stability of the closed-loop system are derived. To relax the sum-of-squares (SOS) based conservative condition, we adopt the Taylor series membership functions (TSMFs) and introduce TSMFs and their approximation error into the stability conditions. Finally, an example is given to illustrate the effectiveness of the design. © 2023 IEEE.

关键词： Lyapunov functions

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Design and Analysis of Polynomial Positive Fuzzy System controllers Based on Markov Transitions

Design and Analysis of Polynomial Positive Fuzzy System Cont...

引用

2024 China Automation Congress, CAC 2024

作者： Chang, Sen Li, Xiaomiao Liu, Fucai Bao, Zhiyong Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao China

ISBN: (纸本)9798350368604

This study explores polynomial Markov positive fuzzy systems, formulating controllers for these systems by examining the prerequisites for positivity and stochastic stability. Initially, polynomials are incorporated into the Markov positive fuzzy system to represent nonlinear elements better and enhance its capacity to model nonlinear systems. Concurrently, the study discusses the non-convex scenarios encountered in the stability analysis of the closed-loop system once the positive fuzzy system controller is integrated and confirms the stability of the Markov polynomial positive fuzzy system. Ultimately, the effectiveness of the proposed approaches is demonstrated through a numerical simulation example. © 2024 IEEE.

关键词： Fuzzy systems

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An Improved NSGAII Algorithm for Flexible Job-shop Scheduling Problem Based on A New Decoding Mechanism 13

An Improved NSGAII Algorithm for Flexible Job-shop Schedulin...

引用

13th IEEE International Conference on CYBER Technology in Automation, control, and Intelligent Systems, CYBER 2023

作者： Li, Man Ma, Kai Guo, Shiliang Li, Shuai Yang, Bin Yanshan University Key Lab of Industrial Computer Control Engineering of Hebei Province Qinhuangdao China

ISBN: (纸本)9798350315196

The flexible job-shop scheduling problem (FJSP) is a famous combinatorial optimization problem. FJSP is widely used in process manufacturing industry, so it is of great significance to study FJSP to improve production efficiency. In this paper, a non-dominated sorting genetic algorithm II based on a new decoding mechanism (NSGAII-NDM) is proposed. Firstly, the opposite-based learning strategy is introduced on the basis of NSGAII, and the sufficiency of global search is improved by generating the opposite value. Secondly, an improved adaptive crossover and mutation probability strategy is added, which can dynamically adjust the inherent crossover and mutation probability with the number of iterations and improve the convergence speed of the algorithm. Furthermore, based on fully active scheduling strategy, a new decoding mechanism is proposed, which can get a better scheduling scheme by arranging the machines and starting time of each process more reasonably. Finally, the improved algorithm is tested in a standard test case, which verifies the superiority of NSGAII-NDM in solving the flexible job-shop scheduling problem. © 2023 IEEE.

关键词： Production efficiency

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Far-infrared vibrational spectra of L-ascorbic acid investigated by terahertz time domain spectroscopy

Far-infrared vibrational spectra of L-ascorbic acid investig...

引用

2nd International Conference on Bioinformatics and Biomedical engineering, iCBBE 2008

作者： Binghua, Cao Guangxin, Zhang Zekui, Zhou State Key Lab. of Industrial Control Technology Department of Control Science and Engineering Zhejiang University Hangzhou 310027 China

ISBN: (纸本)9781424417483

The low frequency vibrational modes, index of refraction, and absorption of L-ascorbic acid from 0.2 to 2.4 THz have been studied by terahertz time domain spectroscopy at room temperature. It is found that there are four dominated vibrational modes at 1.80, 2.05, 2.21 and 2.34 THz and the refractive index, varying between 1.77 and 1.83, has a mean value 1.79 in the 0.2-2.4THz range. In parallel with the experimental study, density functional theory is employed to simulate structure and vibrational frequencies of L-ascorbic acid. Based on the calculated results, the observed vibrational modes in the far infrared region are assigned. © 2008 IEEE.

关键词： Density functional theory

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Research of heat dissipation of RGB-LED acklighting system on LCD

Research of heat dissipation of RGB-LED acklighting system o...

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2009 7th IEEE International Conference on industrial Informatics, INDIN 2009

作者： Shao, Xumin Cai, Yong Li, Huadong Wu, Mingguang State Key Lab. of Industrial Control Technology Department of Control Science and Engineering Zhejiang University Hangzhou Zhejiang China

ISBN: (纸本)9781424437603

Heat dissipation is a very important subject during the design of RGB-LED backlighting system on LCD because the heat produced by modern LEDs themselves can excessively influence their characteristics. This paper reports on a new substrate technology that offers significant benefits over conventional polymer-based insulated metal substrates (IMS). This new type of insulated aluminum substrate printed circuit board (PCB) consists of a thermally-conductive aluminum alloy substrate that insulated by a thin, chemically grown, anodized dielectric layer. Circuit is formed above the anodized layer with magnetron sputtering technology. The corresponding thermal resistances of the new and conventional insulated metal substrate printed circuit board (PCB) are measured to be 4.78 /W and 7.61/W, respectively. More heat transfer means more reliable product, less light reduction and less material consumption because of eliminating the need for additional heat sinks. © 2009 IEEE.

关键词： Printed circuit boards

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Application of PLSR to the voidage measurement of gas-oil two-phase flow

Application of PLSR to the voidage measurement of gas-oil tw...

引用

2007 8th International Conference on Electronic Measurement and Instruments, ICEMI

作者： Xia, Li Baoliang, Wang Zhiyao, Huang Haiqing, Li State Key Lab. of Industrial Control Technology Department of Control Science and Engineering Zhejiang University Hangzhou 310027 China

ISBN: (纸本)1424411351

Based on ECT technique and Partial Least Squares Regression (PLSR), a new voidage measurement method for gas-oil two-phase flow was proposed. PLSR was utilized to develop the voidage measurement models for given flow patterns. In practical voidage measurement process, according to the flow pattern identification result, a related PLSR based model was selected to calculate the measurement voidage. Experimental results show that the proposed method is effective and the accuracy of the voidage measurement is satisfactory. The maximum measurement error is less than 5%. Research results also verify the good real-time performance of the proposed voidage measurement method. Because it implements the voidage measurement without the time-consuming image reconstruction process, the total voidage measurement time is less than 0.1s. © 2007 IEEE.

关键词： Flow patterns

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Classification of tea based on terahertz time domain spectroscopy

Classification of tea based on terahertz time domain spectro...

引用

Photonics and Optoelectronics Meetings (POEM) 2008: Terahertz Science and Technology

作者： Binghua, Cao Guangxin, Zhang Zekui, Zhou State Key Lab. of Industrial Control Technology Department of Control Science and Engineering Zhejiang University Hangzhou 310027 China

ISBN: (纸本)9780819475367

Terahertz time-domain spectroscopy (THz-TDS) is a newly developed technique in the last decade. A new method to classify tea is proposed based on THz-TDS and pattern recognition method. Four kinds of tea are investigated to study its feasibility. Their absorption spectra are measured using the THz-TDS system. Then a pattern recognition method, support vector machine (SVM), is employed to differentiate the investigated tea based on their terahertz data. The absorption spectra between 0.2 and 2.0 THz of the investigated tea samples are selected as the feature to classify them. The correct rate of recognition for the SVM classifier is 96.88%. The results give evidence that different tea varieties can be distinguished based on their terahertz spectra. In this respect, the spectral method provides enough information to differentiate different kinds of tea. © 2009 SPIE.

关键词： Terahertz spectroscopy

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Three-phase full-bridge converters applied to switched reluctance motor drives with a modified switching strategy

Three-phase full-bridge converters applied to switched reluc...

引用

International Conference on Electrical Machines and Systems

作者： Somsiri, P. Tungpimonrut, K. Aree, P. Industrial Control and Automation Lab. National Electronics and Computer Technology Center Thailand Department of Electrical Engineering Thammasat University Thailand

ISBN: (纸本)9788986510089

This paper presents an improved switching strategy for three-phase full-bridge converters applied to switched reluctance motor (SRM) drives. The modified switching strategy is based on the idea that in every electrical cycle the two switches in same leg of the converter alternate their commutating without using dead time. This drive method has several advantages including low cost, compactness, no dead time required, reduced number of switching pulses, and consequently reduced switching loss. The proposed method is analyzed and the experimental is investigated on 1.5 kW, three-phase 6/4 poles SRM which is designed for small electric vehicles by using standard three-phase full-bridge converter. The experimental results have confirmed an acceptable performance of this proposed technique.

关键词： switched reluctance motor three-phase full-bridge converter switching strategy two-phase excitation

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Fixed-Time Sliding Mode Fault-Tolerant Consensus control for Second-Order Multi-Agent System with Actuator Fault 41

Fixed-Time Sliding Mode Fault-Tolerant Consensus Control for...

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第41届中国控制会议

作者： Jing Wang Yi-ming Fang Jian-xiong Li Kun-da Li Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan University Engineering Research Center of the Ministry of Education for Intelligent Control System and Intelligent Equipment

ISBN: (数字)9789887581536

ISBN: (纸本)9781665482561

Aiming at the problems of immeasurable leader state and actuator fault for second-order multi-agent system(MAS),the distributed robust sliding mode fault-tolerant control method based on fixed-time state observer(FTSO) is adopted to realize the fixed time fault-tolerant consensus tracking control for the *** MAS is under the undirected communication *** actuator fault is including partial loss of effectiveness(PLOE) fault and bias ***,a fixed time state observer is designed for each follower to obtain the state information of the ***,for followers with actuator faults,the distributed fixed-time robust sliding mode fault-tolerant controller is designed to realize fault-tolerant consensus tracking ***,the Lyapunov stability theorem is used to prove that the observation error and the consensus control error converge to zero in a ***,the effectiveness of the designed FTSO and fixed-time robust sliding mode fault-tolerant control algorithm is verified by numerical simulation.

关键词： fixed-time state observer fixed-time fault-tolerant control multi-agent systems consensus tracking control

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