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Event-triggered predefined-time control for full-state constrained nonlinear systems: A novel command filtering error compensation method

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Science China(Technological Sciences) 2024年第9期67卷 2867-2880页

作者： PAN YingNan CHEN YiLin LIANG HongJing College of Control Science and Engineering Bohai UniversityJinzhou 121013China School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Laboratory of Electromagnetic Space Cognition and Intelligent Control Beijing 100089China

In this paper, a command filter-based adaptive fuzzy predefined-time event-triggered tracking control problem is investigated for uncertain nonlinear systems with time-varying full-state constraints. By designing a sliding mode differentiator, the inherent computational complexity problem within the predefined-time backstepping framework is solved. Different from the existing command filter-based finite-time and fixed-time control strategies that the convergence time of the filtering error is adjusted through the system initial value or numerous parameters, a novel command filtering error compensation method is presented,which tunes one control parameter to make the filtering error converge in the predefined time, thereby reducing the complexity of design and analysis of processing the filtering error. Then, an improved event-triggered mechanism(ETM) that builds upon the switching threshold strategy, in which an inverse cotangent function is designed to replace the residual term of the ETM,is proposed to gradually release the controller's dependence on the residual term with increasing time. Furthermore, a tan-type nonlinear mapping technique is applied to tackle the time-varying full-state constraints problem. By the predefined-time stability theory, all signals in the uncertain nonlinear systems exhibit predefined-time stability. Finally, the feasibility of the proposed algorithm is substantiated through two simulation results.

关键词： predefined-time control command filtering error compensation method event-triggered mechanism time-varying full-state constraints uncertain nonlinear systems

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Flake channels construction of hydroxyapatite/gelatin cryogel with excellent flame retardant properties for enhancing the capturing of iodine

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Collagen and Leather 2024年第1期5卷 101-112页

作者： Yanxia Wei Bo Wang Liyan Cao Xin Cheng Yuhan Qiao Tao Duan Guiqiang He Pingping Ding Yan Zhou Jian Zhou Engineering Research Center of Biomass Materials School of Life Science and EngineeringMinistry of EducationSouthwest University of Science and TechnologyMianyang 621010SichuanPeople's Republic of China The Collelge of Nuclear Technology and Automation Engineering Chengdu University of TechnologyChengdu 610059SichuanPeople's Republic of China NHC Key Laboratory of Nuclear Technology Medical Transformation Mianyang Central HospitalMianyang 621000SichuanPeople's Republic of China

Safe and efficient capturing of volatile radioiodine is of extremely important significance in the treatment of spent ***,the flake channels in gelatin-hydroxyapatite(HAP@Ge)cryogel with excellent flame retardant properties were constructed by immobilizing hydroxyapatite nanorods(HAP)on Gelatin(Ge)cryogel for enhancing the capturing of *** immobilization of HAP nanorods enhanced thermal stability,provided low rates of dynamic heat transfer and dissipation,and remarkably improved the flame retardant and smoke suppression properties of the Ge cryogel,which can effectively prevent the occurrence of safety incidents caused by further thermal degradation or combustion of this *** importantly,it was effective in improving the rapid enrichment of iodine,resulting in a high adsorption *** maximum adsorption capacity of HAP@Ge cryogel for iodine vapor reached 2693 mg/g at *** high adsorption capacity for iodine was attributed to the multi-scale porous structure in HAP@Ge cryogel,which offered effective channels for iodine diffusion,whereas the numerous complex and irregular flakes provided sufficient number of active sites for iodine *** adsorption process was chemical in nature and involved the-PO_(4)^(3-),-OH,-C=O,and-NHR groups on HAP@Ge ***,the complex porous structure of HAP@Ge cryogel enhanced the physical capturing of *** advantages,such as low-cost raw material,simple preparation method,good flame retardancy,and excellent capturing performance for iodine indicated that HAP@Ge cryogel is a potential candidate for the removal of radioactive iodine in the exhaust gas stream of post-treatment plants.

关键词： Gelatin Hydroxyapatite nanorod Flake channel Flame retardancy Iodine capture

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Verification of a self-developed CFD-based multi-physics coupled code MPC-LBE for LBE-cooled reactor

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nuclear Science and Techniques 2021年第5期32卷 84-100页

作者： Zhi-Xing Gu Qing-Xian Zhang Yi Gu Liang-Quan Ge Guo-Qiang Zeng Mu-Hao Zhang Bao-Jie Nie College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyChengdu 610059China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China

To perform an integral simulation of a pool-type reactor using CFD code,a multi-physics coupled code MPC-LBE for an LBE-cooled reactor was proposed by integrating a point kinetics model and a fuel pin heat transfer model into self-developed CFD *** code verification,a code-to-code comparison was employed to validate the CFD ***,a typical BT transient benchmark on the LBE-cooled XADS reactor was selected for verification in terms of the integral or system *** on the verification results,it was demonstrated that the MPC-LBE coupled code can perform thermal-hydraulics or safety analyses for analysis for processes involved in LBE-cooled pool-type reactors.

关键词： LBE-cooled pool-type reactor Computational fluid dynamics Multi-physics coupling code Safety analysis code Verification

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Research on Performance Computer Evaluation Model of Low-Temperature Protective Clothing Based on Explicit Difference Method 2

Research on Performance Computer Evaluation Model of Low-Tem...

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2nd IEEE International Conference on Data Science and Computer Application, ICDSCA 2022

作者： Deng, Hui Sun, Yiqing The College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu Sichuan610059 China

ISBN: (数字)9781665472005

ISBN: (纸本)9781665472005

At present, the research institute has developed a three-layer low-temperature protection composite material. Low-temperature protective materials are mainly used for short-term low-temperature protection, effectively reducing the harm of the external environment to the human body. In this paper, considering that the heat release capacity of the phase change layer is different at different temperatures, according to the data of heat release capacity and temperature of protective materials, the change of heat release capacity Q and field temperature T is fitted by Fourier function, and the functional relationship of material heat release is obtained. Therefore, the model is divided into three stages and calculated separately. In the first stage, there is no self-heating or internal heat source in the three-layer materials, so according to the law of conservation of energy and Fourier law, the unsteady heat conduction formula is deduced and solved. In the second stage, the phase change layer begins to release heat, and the first stage model is added to each layer's heat conduction control equation with heat release capability. The third stage is similar to the first stage. With the help of the explicit difference method, the model is discretized, and the cooling model of materials is solved to effectively evaluate the protective ability of low-temperature protective composites. © 2022 IEEE.

关键词： Phase change materials

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Automated Production Line Control System based on Industrial Cloud Platform

Automated Production Line Control System based on Industrial...

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2022 International Conference on Intelligent Manufacturing and Industrial automation, CIMIA 2022

作者： Liu, JianQin Li, LinLin Qu, Tao He, HuiDong The College of Nuclear Technology and Automation Engineering Chengdu University of Technology Sichuan Chengdu610059 China

ISBN: (纸本)9781510655966

With the rapid development of modern industry, enterprises have an increasing demand for data monitoring and automated control of multiple production outlets and production lines. This paper first analyses the structure of the production line, completes the control system model design, establishes the network framework of the system, designs the human-machine interaction interface, gives the SFC flow chart of the workstations and the communication scheme of the PLC between each station, and finally realises the real-time interaction of the monitoring data in the industrial cloud platform. The research contributes new ideas to related research in this field. © 2022 SPIE.

关键词： Control systems

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Application of X-ray fluorescence technology in lithology discrimination

Application of X-ray fluorescence technology in lithology di...

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2023 International Conference on Computer Application and Information Security, ICCAIS 2023

作者： Liu, Guili Zhai, Juan Zhang, Wei Lai, Wanchang Zhao, Ziqi Li, Wen Wang, Guangxi Yang, Qiang Chen, Ran College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu610059 China Chengdu Institute of Product Quality Inspection Co. Ltd. Sichuan Chengdu610100 China Chengdu Zhongfu Technology Co. Ltd. Sichuan Chengdu610100 China

ISBN: (纸本)9781510675032

X-ray fluorescence data are not only an important indicator in petroleum exploration, but they are also an advantage in lithology discrimination. From the perspective of the application of nuclear technology in drilling and exploration, in this paper, the X-ray fluorescence count rate of the core is used as the basic data for core logging, and the geology and multivariate statistical data are analyzed to analyze the lithology of the core. X-ray fluorescence analysis can provide the fluorescence count rates of 35 elements in a core sample. If there are n core samples, an n*35 matrix can be created. If 35 types of fluorescence count rates are used as the independent variables to directly identify the lithology, the dataset is very large, and some of the independent variables are not strongly correlated. Therefore, the discrimination effect is insufficient for achieving the purpose. Therefore, based on the diagenetic characteristics of sedimentary rocks and the main rock-forming elements and using multivariate statistical methods, in this paper, the count rates of five elements (i.e., Si, Fe, Al, K, and Ca) are selected as independent variables for the lithology discrimination. It is reasonably transformed to obtain the matrix coefficients before dimensionality reduction. The original five-dimensional dataset is reduced to two dimensions using matrix coefficients. Then, Fisher's discriminant method is applied to the dimensionally reduced data to discriminate and classify the lithology. Based on the discrimination results, the X-ray fluorescence count rate and mathematical statistics can be used to obtain a good effect in lithology discrimination. © 2024 SPIE.

关键词： Lithology

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Advances in Metal Halide Perovskite Scintillators for X-Ray Detection

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Nano-Micro Letters 2025年第1期17卷 1-38页

作者： Wang, Ting Zeng, Guoqiang Yang, Yang Michael Yang, Zhi Wang, Tianchi Li, Hao Han, Lulu Yu, Xue Xu, Xuhui Ouyang, Xiaoping College of Materials and Chemistry & Chemical Engineering Nuclear Technology Key Laboratory of Earth Science Chengdu University of Technology Chengdu610059 China State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology Xi’an710024 China Nuclear Technology Key Laboratory of Earth Science Chengdu University of Technology Chengdu610059 China Faculty of Materials Science and Engineering Key Laboratory of Advanced Materials of Yunnan Province Kunming University of Science and Technology Kunming650093 China Key Laboratory of Materials Physics of Ministry of Education Laboratory of Zhongyuan Light School of Physics Zhengzhou University Zhengzhou450051 China State Key Laboratory of Modern Optical Instrumentation Institute for Advanced Photonics College of Optical Science and Engineering Zhejiang University Hangzhou310027 China School of Mechanical Engineering Institute for Advanced Materials Chengdu University Chengdu610106 China

The review highlights recent advancements in enhancing the intrinsic physical properties of metal halide perovskite scintillators, such as improving light yield and response times, to improve their X-ray detection performance. It discusses innovative engineering strategies to effectively optimize radioluminescent light management for high-resolution X-ray imaging. The problems encountered in the application of metal halides perovskites materials for X-ray detection are summarized, and the potential development direction in the future is prospected. © The Author(s) 2025.

关键词： Scintillation counters

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Distributed Adaptive Cooperative Control for Human-in-the-Loop Heterogeneous UAV-UGV Systems with Prescribed Performance

IEEE Transactions on Intelligent Vehicles

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IEEE Transactions on Intelligent Vehicles 2024年 1-13页

作者： Liang, Hongjing Yang, Shoufeng Li, Tieshan Zhang, Huaguang School of Automation Engineering University of Electronic Science and Technology of China Chengdu China College of Control Science and Engineering Bohai University Jinzhou China State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Shenyang China

This paper focuses on the distributed adaptive cooperative control problem for human-in-the-loop (HiTL) heterogeneous unmanned aerial vehicle-unmanned ground vehicle (UAV-UGV) systems via an improved prescribed performance approach. A novel human motion recognition system (HMRS) is designed and integrated into the HiTL strategy. Specifically, the leader trajectory can be changed in real time based on HMRS and the leader signal library to cope with various unexpected situations. This HiTL strategy solves the discontinuity and non-differentiability problems that may exist before and after human modification of leader signals within the extremely short time in conventional HiTL strategies. Moreover, an improved predefined-time prescribed performance approach is proposed, in which the performance function only needs to be first-order continuous differentiable instead of infinite-order continuous differentiable. This approach can greatly broaden the selection range of performance functions. Furthermore, a unified model of heterogeneous UAV-UGV systems is established to avoid designing UAV and UGV systems separately, which improves the universality of the control algorithm. Finally, the proposed HiTL control scheme is applied to a simulation example to verify its feasibility and effectiveness. IEEE

关键词： Intelligent vehicle highway systems

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A PSEUDO-RANDOM SIGNAL GENERATOR BASED ON 3D DISCRETE MEMRISTOR CHAOTIC MAP 10

A PSEUDO-RANDOM SIGNAL GENERATOR BASED ON 3D DISCRETE MEMRIS...

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10th International Symposium on Test automation and Instrumentation, ISTAI 2024

作者： Qian, Lei Shi, Wei Guo, Yuchuan Chen, Kai Xu, Bo Zhao, Jia College of Automation Engineering University of Electronic Science and Technology of China Chengdu China College of Big Health & Intelligent Engineering Chengdu Medical College of China Chengdu China

ISBN: (纸本)9781837242672

Pseudo-random number generators that can quickly generate noise-like noise have high value in engineering applications. However, the methods currently used in many signal generators do not produce noise with enough randomness to satisfy engineering applications. Based on the properties possessed by the memristor, a novel method is proposed in this paper. A 3D discrete memristor model is constructed by coupling the discrete memristor to a discrete system, and its complex dynamical behavior, which depends on the system parameters and initial values, is analyzed. The results show that the 3D-DM exhibits hyperchaotic behavior. An experimental platform was built using FPGA and DAC, and the phase-trajectory diagrams obtained using oscilloscope capture are highly similar to the simulation results, which proves the feasibility of realizing 3D-DM using digital hardware circuits. Finally, a pseudo-random number generator is designed with a hardware operation speed of 350 Mps. The proposed method outperforms the existing methods. © The Institution of engineering & technology 2024.

关键词： Random number generation

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Research on MPPT Control of a Direct-Drive Wave Energy Converter Based on Adaptive Perturbation Observation Method

Research on MPPT Control of a Direct-Drive Wave Energy Conve...

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IEEE Asia Power and Energy engineering Conference (APEEC)

作者： Ruixian Wang Hailian Jing Linlin Li Hongyu Zhu College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu China

ISBN: (数字)9798331517540

ISBN: (纸本)9798331517557

As an efficient wave energy conversion technology, direct-drive wave energy converters (WECs) have attracted extensive attention. Due to the highly unstable and nonlinear nature of the wave energy environment, effectively capturing maximum power from the wave is crucial to improve system efficiency. In this paper, an adaptive perturbation observation (APO) method is proposed, which dynamically adjusts the perturbation step size by introducing adaptive strategy, so that the system can track the maximum power point more quickly and stably. Simulation results demonstrates that the algorithm not only improves the tracking speed, but also effectively reduces the oscillation and energy loss of the system.

关键词： Maximum power point trackers Renewable energy sources Adaptive systems Perturbation methods Simulation Heuristic algorithms Robustness Wave energy conversion Oscillators Optimization

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