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第41届中国控制会议

作者： Shuyan Zhou School of Information and Control Engineering China University of Mining and Technology Engineering Research Center of Intelligent Control for Underground Space Ministry of EducationChina University of Mining and Technology

ISBN: (数字)9789887581536

ISBN: (纸本)9781665482561

This work investigates an adaptive control approach for output constrained uncertain robotic *** contrast to the currently studied case,where the constraint boundary functions are purely determined by time,the constraint boundary functions in this situation are dictated by the operation time and desired trajectory or even link *** introducing the virtual parameter and constructing the barrier Lyapunov function,the presented control scheme not only ensures that such state constraints for robotic systems are not violated,it also assures that link displacement tracks the desired trajectory *** simulation and stability analysis verify the effectiveness of the designed algorithm.

关键词： Adaptive Tracking control Robotic Systems Full State Constraints

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Stability and bifurcation analysis of delayed tri-trophic food chain model in poisoned environment with fear effect and additional food

Stability and bifurcation analysis of delayed tri-trophic fo...

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作者： Ramasamy, Sivasamy Banjerdpongchai, David Park, PooGyeon Center of Excellence in Intelligent Control Automation of Process Systems Department of Electrical Engineering Faculty of Engineering Chulalongkorn University Bangkok Thailand Department of Electrical Engineering Pohang University of Science and Technology Pohang Korea Republic of

One of the most important goals of theoretical ecologists is to find a strategy for controlling the chaos in ecological models to maintain healthy ecosystems. We investigate the influence of fear and the supply of additional food to predators in a delayed tri-trophic food chain model, where interference among the species is determined by Holling type-II functional response. The proposed model incorporates the fact that the growth rates of prey and middle predators are decreased due to the fear of middle and special predators, respectively. The additional food is supplied to both predators by either nature or external agencies. Furthermore, the poisoned prey in the predator's environment is taken into account. In the proposed model, we use two time delays: one for the growth term of the middle predator and another for the gestation delay of the special predator. We determine the conditions for the existence of ecologically feasible equilibrium points and their local and global stability. In addition, we establish the conditions for the existence of Hopf bifurcation around interior equilibrium to seek periodic behavior in nondelayed and delayed models. Numerical investigations are performed to justify the proposed theoretical findings through phase portraits, time series of solutions, and bifurcation diagrams. We observe that the chaotic dynamics of a tri-trophic food chain model can be controlled by the proper choice of the fear effect and by supplying additional food parameters. As a result, our findings provide more ecological insights into the dynamics of the delayed tri-trophic food chain model with the fear effect and additional food supply. © 2023 John Wiley & Sons, Ltd.

关键词： Hopf bifurcation

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Clamping and buffering mechanism for large-caliber rocket projectiles based on bistable shells 4

Clamping and buffering mechanism for large-caliber rocket pr...

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4th International Conference on Defence Technology, ICDT 2024

作者： Li, Zhuangzhuang Li, Xuelin Guo, Zhuoyu Zhou, Yue Lin, Jiahui Han, Shuo Mo, Zonglai Li, Jun School of Mechanical Engineering Nanjing University of Science and Technology Nanjing210094 China Xi'An Modern Control Technology Research Institute Xian710065 China

Long-range large-caliber rocket projectiles are prone to impact with the rail on the launch box due to overload during transportation. In order to hold the rocket tightly during transportation and quickly separate it during launch, this paper proposes a novel clamping mechanism based on the bistable shells, which can not only provide transportation protection for the rocket projectile but also quickly detach from the rocket projectile. Through numerical study, the force-displacement curve of a single clamping mechanism under instantaneous compression load and the opening process under pneumatic load were analyzed. Based on this, a finite element model simulating the overload during transportation was established to compare the effects with and without the clamping mechanism. The results show that the designed clamping mechanism meets the design expectations, providing excellent protection for the rocket projectile, and allowing for quick opening. This mechanism also has broad application prospects in other fields such as packaging engineering and soft clamping mechanisms. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Projectiles

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Droop control for Microgrids with Variable Inverter Outputs: A Virtual Impedance-Based Adaptive Strategy

Droop Control for Microgrids with Variable Inverter Outputs:...

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2024 IEEE International Conference on Unmanned Systems, ICUS 2024

作者： Zhang, Hualin Wang, Shuwang Zhang, Baicheng Kong, Guanqiao School of Electrical and Control Engineering Liaoning Technical University Huludao China School of Cyber Science and Engineering Southeast University Nanjing China CSSC Systems Engineering Research Institute Beijing China

ISBN: (纸本)9798350384185

With the widespread application of renewable energy sources (RES) in islanded microgrids, the system instability caused by the intermittency of RES generation has also increased. To maintain stability during RES fluctuations, a n ovel adaptive droop control strategy utilizing adaptive virtual impedance is proposed in this study. This strategy allows the droop coefficients and virtual impedance to adaptively change based on the actual capacity of the inverters, thereby automatically adjusting the inverter output voltage and ensuring proper power sharing even as inverter capacity changes. Moreover, this strategy ensures appropriate power sharing under different load conditions and microgrid configurations. F inally, t he p roposed s trategy i s validated through MATLAB/Simulink simulations, showcasing its advantages over traditional droop control. © 2024 IEEE.

关键词： Microgrids

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Intelligent Signal Timing Optimization Model with Bus Priority Based on Multi-Process Experience Pool

Journal of Network Intelligence

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Journal of Network Intelligence 2023年第3期8卷 710-726页

作者： Liao, Lyuchao Tang, Penghao Zhao, Zhaolin Zheng, Qi Li, Zhengrong Zhu, Yintian Fujian Provincial Universities Key Laboratory of Industrial Control and Data Analysis Fujian Provincial Universities Engineering Research Center for Intelligent Driving Technology Fujian University of Technology Fuzhou350118 China

Nowadays, the imbalance between urban traffic demand and road infrastruc-tures is getting more serious, resulting in serious urban traffic congestion. Unlike private cars, buses can carry more passengers under the same road segment with lower energy consumption. However, existing studies usually ignore the impacts of vehicle turn signal states on action selection and the impacts of experience pool sampling efficiency on model training. Therefore, with the increasing number of priority buses on the road, it will en-counter the problem of bus response conflict. In this work, we propose an intelligent signal timing optimization model with bus priority based on a multi-process experience pool, named MP-3DQN. The model considers the turn signal state of the vehicle and the bus priority switching scheme, which can help predict the vehicles’ future direction and provide a basis for the agent in action selection. We introduce a multi-process parallel method to break the correlation between samples and improve the sampling efficiency of sample data. In addition, we propose a multi-objective reward function to make the agent more sensitive to the changing detection, and we constrain the green light duration and optimize the average delay of vehicles and intersection throughput. Extensive experiments were conducted with SUMO on intersection roads in Fuzhou City, and the results show that MP-3DQN could significantly reduce the average delay time of buses without affecting traffic efficiency. © 2023, Journal of Network Intelligence. All Rights Reserved.

关键词： Timing circuits

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Kinematics Analysis and Singularity Avoidance of a Parallel Mechanism with Kinematic Redundancy

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Chinese Journal of Mechanical engineering 2022年第5期35卷 244-261页

作者： Chaoyu Shen Haibo Qu Sheng Guo Xiao Li Robotics Research Center School of MechanicalElectronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China China Waterborne Transport Research Institute Beijing 100088China Key Laboratory of Vehicle Advanced Manufacturing Measuring and Control TechnologyMinistry of EducationBeijing Jiaotong UniversityBeijing 100044China

The kinematic redundancy is considered as a way to improve the performance of the parallel *** this paper,the kinematics performance of a three degree-of-freedom parallel mechanism with kinematic redundancy(3-DOF PM-KR)and the influence of redundant parts on the PM-KR are ***,the kinematics model of the PM-KR is *** inverse solutions,the Jacobian matrix,and the workspace of the PM-KR are ***,the influence of redundancy on the PM-KR is *** there exists kinematic redundancy,the PM-KR possesses fault-tolerant *** locking one actuating joint or two actuating joints simultaneously,the fault-tolerant workspace is *** the position of the redundant part is changed,the workspace and singularity will be *** results show that kinematic redundancy can be used to avoid ***,the simulations are performed to prove the theoretical analysis.

关键词： Parallel mechanism Kinematic redundancy Singularity Simulation analysis

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An Adaptive Sliding Mode controller for Virtual Coupling High-speed Train 42

An Adaptive Sliding Mode Controller for Virtual Coupling Hig...

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42nd Chinese control Conference, CCC 2023

作者： He, Runze Zhang, Yadong Southwest Jiaotong University School of Information Science and Technology Chengdu611765 China Sichuan Engineering Research Center of Train Operation Control Technology Chengdu611765 China

ISBN: (纸本)9789887581543

Virtual coupling is a new concept of train control system, which uses virtual connections and train-to-train communication instead of physical connections between trains. It can shorten the train tracking headway and significantly improve the transport efficiency. For the uncertain and nonlinear characteristics in the process of train control, this paper proposed an adaptive sliding mode controller. The controller can overcome the modeling error and external disturbance with unknown boundary, and can achieve adaptive control parameters tuning. The stability of the system was proved by Lyapunov theory. In addition, based on the relative speed method, this paper proposed virtual coupling minimum safety distance model and reference distance model, which are combined with the controller to ensure close tracking and safe operation of the train. Finally, with the real rail line and train data, a common train tracking scene was designed to simulate. Compared with other typical controller, simulation results verify the advantages of the proposed controller. © 2023 Technical Committee on control Theory, Chinese Association of Automation.

关键词： controllers

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Data Security Storage Mechanism Based on Blockchain Network

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Computers, Materials & Continua 2023年第3期74卷 4933-4950页

作者： Jin Wang WeiOu Wenhai Wang RSimon Sherratt Yongjun Ren Xiaofeng Yu School of Computer&Communication Engineering Changsha University of Science&TechnologyChangsha410004China School of Control Science and Engineering Zhejiang UniversityHangzhou310058China School of Systems Engineering The University of ReadingReadingRG66AYUK School of Computer Engineering Research Center of Digital Forensics of Ministry of EducationNanjing University of Information Science&TechnologyNanjing210044China School of Business Nanjing UniversityNanjing210093China

With the rapid development of information technology,the development of blockchain technology has also been deeply *** performing block verification in the blockchain network,if all transactions are verified on the chain,this will cause the accumulation of data on the chain,resulting in data storage *** the same time,the security of data is also challenged,which will put enormous pressure on the block,resulting in extremely low communication efficiency of the *** traditional blockchain system uses theMerkle Tree method to store *** verifying the integrity and correctness of the data,the amount of proof is large,and it is impossible to verify the data in batches.A large amount of data proof will greatly impact the verification efficiency,which will cause end-to-end communication delays and seriously affect the blockchain system’s stability,efficiency,and *** order to solve this problem,this paper proposes to replace the Merkle tree with polynomial commitments,which take advantage of the properties of polynomials to reduce the proof size and communication *** realizing the ingenious use of aggregated proof and smart contracts,the verification efficiency of blocks is improved,and the pressure of node communication is reduced.

关键词： Blockchain cryptographic commitment smart contract data storage

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Machine learning prediction of concrete frost resistance and optimization design of mix proportions

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Journal of Intelligent and Fuzzy Systems 2025年第1-2期48卷 47-72页

作者： Dai, Jinpeng Zhang, Zhijie Yang, Xiaoyuan Wang, Qicai He, Jie National and Provincial Joint Engineering Laboratory of Road & Bridge Disaster Prevention and Control Lanzhou Jiaotong University Lanzhou China State Key Laboratory of High Preformance in Civil Engineering Materials Jiangsu Research Institute of Building Science CO. LTD Nanjing China School of Materials Science and Engineering Southeast University Nanjing China Civil Engineering Department Lanzhou Jiaotong University Lanzhou China

This study explores nine machine learning (ML) methods, including linear, non-linear and ensemble learning models, using nine concrete parameters as characteristic variables. Including the dosage of cement (C), fly ash (FA), Ground granulated blast furnace slag (GGBS), coarse aggregate (G), fine aggregate (S), water reducing agent (WRA) and water (W), initial gas content (GC) and number of freeze-thaw cycles (NFTC), To predict relative dynamic elastic modulus (RDEM) and mass loss rate (MLR). Based on the linear correlation analysis and the evaluation of four performance indicators of R2, MSE, MAE and RMSE, it is found that the nonlinear model has better performance. In the prediction of RDEM, the integrated learning GBDT model has the best prediction ability. The evaluation indexes were R2 = 0.78, MSE = 0.0041, MAE = 0.0345, RMSE = 0.0157, SI = 0.0177, BIAS = 0.0294. In the prediction of MLR, ensemble learning Catboost algorithm model has the best prediction ability, and the evaluation indexes are R2 = 0.84, MSE = 0.0036, RMSE = 0.0597, MAE = 0.0312, SI = 5.5298, BIAS = 0.1772. Then, Monte Carlo fine-tuning method is used to optimize the concrete mix ratio, so as to obtain the best mix ratio. © 2025 – IOS Press. All rights reserved.

关键词： Sensitivity analysis

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research on Helicopter Sound Detection Based on Adaptive Filtering 6

Research on Helicopter Sound Detection Based on Adaptive Fil...

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6th International Conference on Information Communication and Signal Processing, ICICSP 2023

作者： Liu, Zhaonian Liu, Tingting Wei, Chunhua School of Information Engineering Southwest University of Science and Technology Mianyang China Key Laboratory of Aerodynamic Noise Control China Aerodynamics Research and Development Center Mianyang China

ISBN: (纸本)9798350339994

In the field of helicopter acoustic detection, a primary concern is the identification of rotor noise emissions. One challenge is that, over long transmission distances, rotor noise is often masked by ambient noise, making its detection nearly impossible. To achieve long-range helicopter noise detection, it is crucial to restore the frequency characteristics of the received rotor noise signal. This study proposes the use of an adaptive filter to precisely isolate and process this signal. Through this method, we aim to establish an effective long-range helicopter noise detection system. The results presented in this paper demonstrate the adaptive filter's ability to accurately recover the frequency features unique to helicopter rotor noise, confirming the feasibility of a potent long-range helicopter acoustic detection system. © 2023 IEEE.

关键词： acoustic detection adaptive filtering Helicopter rotor noise

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