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A general Boolean semantic modelling approach for complex and intelligent industrial systems in the framework of DES

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Journal of systems Engineering and Electronics 2024年第5期35卷 1219-1230页

作者： XU Changyi WANG Yun DUAN Yiman ZHANG Chao Key Laboratory of Intelligent Control and Optimization for Industrial Equipment of Ministry of Education School of Control Science and EngineeringDalian University of TechnologyDalian 116024China State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China

Discrete event system(DES)models promote system engineering,including system design,verification,and *** advancement in manufacturing technology has endowed us to fabricate complex industrial ***,the adoption of advanced modeling methodologies adept at handling complexity and scalability is ***,industrial systems are no longer quiescent,thus the intelligent operations of the systems should be dynamically specified in the *** this paper,the composition of the subsystem behaviors is studied to generate the complexity and scalability of the global system model,and a Boolean semantic specifying algorithm is proposed for generating dynamic intelligent operations in the *** traditional modeling approaches,the change or addition of specifications always necessitates the complete resubmission of the system model,a resource-consuming and error-prone *** with traditional approaches,our approach has three remarkable advantages:(i)an established Boolean semantic can be fitful for all kinds of systems;(ii)there is no need to resubmit the system model whenever there is a change or addition of the operations;(iii)multiple specifying tasks can be easily achieved by continuously adding a new ***,this general modeling approach has wide potential for future complex and intelligent industrial systems.

关键词： industrial complex system operation specifying Boolean semantic discrete event system(DES)theory intelligent operation

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Lattice Boltzmann study on the effects of surface nanostructure on wettability with application in laser scanning fabrication of superhydrophobic surfaces

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Science China(Technological Sciences) 2023年第11期66卷 3197-3205页

作者： HUANG Hao GUO MingHui WU CongYi RONG YouMin HUANG Yu ZHANG GuoJun State Key Laboratory of Intelligent Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China

Nanostructured surfaces with dimensions on a scale of a few millimeters exhibit remarkable *** geometry of these nanostructures considerably affects their ***,determining the optimal geometry is challenging due to the abundance of geometry parameters and the difficulty in numerically describing their effects on wettability at the mesoscopic *** addition,the fabrication of nanostructured surfaces with precise geometries is *** establish a lattice Boltzmann method(LBM)model to address these *** use the model to gain mesoscopic insights into the interaction between droplets and *** model can accurately reproduce contact angles(CAs)on various nanostructured surfaces and enables investigation of the effects of nanostructure geometry on *** optimize the geometry of the nanostructures using the insights provided by the LBM model on the wettability *** analysis indicates that cones with dimensions of 40μm in width and 33μm in height exhibit the highest *** successfully fabricate a superhydrophobic surface with the desired geometry via laser scanning,achieving a CA of 163°.We believe that this approach,which combines the LBM model and laser manufacturing,will enable a better understanding of the wettability mechanism and provide a high-performance approach for fabricating superhydrophobic surfaces.

关键词： wettability lattice Boltzmann method nanostructure laser scanning

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Flexible sensors with zero Poisson's ratio

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National Science Review 2024年第5期11卷 153-169页

作者： Xin Huang Tianzhao Bu Qingyang Zheng Shaoyu Liu Yangyang Li Han Fang Yuqi Qiu Bin Xie Zhouping Yin Hao Wu Department of Mechanical Engineering Flexible Electronics Research Center State Key Laboratory of Intelligent Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and Technology Department of Electronic Science and Technology School of Integrated CircuitsHuazhong University of Science and Technology

Flexible sensors have been developed for the perception of various stimuli. However, complex deformation,usually resulting from forces or strains from multi-axes, can be challenging to measure due to the lack of independent perception of multiaxial stimuli. Herein, flexible sensors based on the metamaterial membrane with zero Poisson's ratio(ZPR) are proposed to achieve independent detection of biaxial stimuli. By deliberately designing the geometric dimensions and arrangement parameters of elements, the Poisson's ratio of an elastomer membrane can be modulated from negative to positive, and the ZPR membrane can maintain a constant transverse dimension under longitudinal stimuli. Due to the accurate monitoring of grasping force by ZPR sensors that are insensitive to curvatures of contact surfaces, rigid robotic manipulators can be guided to safely grasp deformable objects. Meanwhile, the ZPR sensor can also precisely distinguish different states of manipulators. When ZPR sensors are attached to a thermal-actuation soft robot, they can accurately detect the moving distance and direction. This work presents a new strategy for independent biaxial stimuli perception through the design of mechanical metamaterials, and may inspire the future development of advanced flexible sensors for healthcare, human–machine interfaces and robotic tactile sensing.

关键词： zero Poisson's ratio metamaterials independent perception of multiaxial stimuli flexible sensor

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The electromagnetic transient simulation acceleration algorithm based on delay mitigation of dynamic critical paths

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Energy Informatics 2025年第1期8卷 1-12页

作者： Guo, Qi Lu, Yuanhong Zhang, Jie Zhang, Jingyue Huang, Libin Guo, Haiping Guo, Tianyu Tu, Liang State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou510663 China National Energy Power Grid Technology R & D Centre Guangzhou510663 China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou510663 China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou510663 China

The task scheduling problem based on directed acyclic graphs (DAGs) has been proven to be NP-complete in general cases or under certain restrictions. In this paper, building upon existing scheduling algorithms, we introduce a static task scheduling algorithm based on directed acyclic graphs. By incorporating the proportion of task transmission delay as a guiding metric in the optimization process, processors can be prioritized for tasks with high latency, thereby improving computational efficiency. We first validate the theoretical feasibility of the algorithm using a theoretical case study and illustrate the algorithmic effectiveness using two real case studies, direct current (DC) model and alternating current (AC) model respectively. The research indicates that the scheduling algorithm proposed in this paper achieves an average scheduling length improvement of over 1.2% compared to the Heterogeneous Earliest-Finish-Time algorithm (HEFT) in topologies with high latency tasks. Additionally, the experiments show that the HEFT algorithm consumes 39.85us and the EMT-DM algorithm consumes 38.29us during simulation using DC, and the HEFT algorithm consumes 31.23us and the EMT-DM algorithm consumes 26.51us during simulation using AC, both of which are improved compared to the HEFT algorithm. © The Author(s) 2025.

关键词： Flow graphs

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Notch Flexure as Kirigami Cut for Tunable Mechanical Stretchability towards Metamaterial Application

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International Journal of Smart and Nano Materials 2022年第2期13卷 203-217页

作者： Yanqi Yin Yang Yu Bo Li Guimin Chen State Key Laboratory of Manufacturing System Engineering Shaanxi Key Laboratory of Intelligent RobotsSchool of Mechanical EngineeringXi’an Jiaotong UniversityXi’anShaanxiChina

Kirigami is an art of paper cutting,which can be used in mechanical metamaterials,actuators,and energy absorption based on its deployable and load-deflection *** cuts with zero width produce undesirable plastic deformation or even tear fracture due to stress concentration in *** study proposes to enlarge the cut width into a notch flexure,which is applied to an orthogonality-cutted kirigami sheet,which buckles out of plane into a 3D configuration patterns under uniaxial *** use of compliant beam as the notch makes the stress distribution around the cuts more uniform in both elastic and elastoplastic *** experimental and numerical results show that by tuning the geometric parameters of cuts and material properties of the sheets,the trigger condition of 3D patterns can be *** capability of tunable phononic wave propagation in this kirigami-inspired metamaterial is *** design methodology offers a theoretical guide for kirigami-based structures.

关键词： Kirigami design compliant mechanism flexural hinge mechanical metamaterials buckling instability

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RUL Prediction of Rolling Bearing via Input Feature Alignment-Combined Different Failure Behavior 15

RUL Prediction of Rolling Bearing via Input Feature Alignmen...

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15th IEEE Global Reliability and Prognostics and Health Management Conference, PHM-Beijing 2024

作者： Pei, Xuewu Gao, Yiping Gao, Liang Li, Xinyu State Key Laboratory of Intelligent Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9798350354010

Transfer learning methods for remaining useful life (RUL) prediction of rolling bearings have been used for the problem of data distribution discrepancy under variable operating condition and have received sustained attention. However, the data distribution discrepancy still exists between different failure behaviors. To solve this problem, a novel RUL prediction method for rolling bearing under different failure behavior via input feature alignment is proposed. First, an alignment strategy between input features of envelope spectrum is proposed, which makes the data distribution smaller by aligning the input features of the test set and the training set. Meanwhile, it is also considered a normalized way that can be used for online prediction rather than using min-max normalization. Then, a RUL prediction method via the feature alignment strategy-combined failure behavior is proposed, which transforms prediction tasks from variable operating condition to different failure behavior to achieve the better RUL prediction results. Finally, Experiments conducted on IEEE PHM2012 run-to-failure bearing datasets validated the superiority of the proposed method according to the comparative results. © 2024 IEEE.

关键词： Roller bearings

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RESEARCH ON SUBPIXEL CENTERLINE EXTRACTION METHOD OF LINE STRUCTURED LIGHT STRIPE

UPB Scientific Bulletin, Series C: Electrical Engineering an...

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UPB Scientific Bulletin, Series C: Electrical Engineering and Computer Science 2023年第1期85卷 91-104页

作者： Zheng, Qingchun Shi, Hao Zhu, Peihao Liu, Qipei Ma, Wenpeng Li, Xiaoyang Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China China

In the process of using line structured light for measurement, it is an essential step to quickly and accurately extract the center position from the line structured light stripe to improve the accuracy of the line structured light measurement system. At present, it is difficult to reduce the extraction time while ensuring the extraction accuracy by the commonly used line structured light centerline extraction methods. In order to solve this problem, the article proposes a centerline extraction method based on extreme value method and gray gravity method. The experimental results show that this method can extract the light stripe centerline more accurately and quickly, which provides a solid guarantee for the next point cloud data acquisition. © 2023, Politechnica University of Bucharest. All rights reserved.

关键词： Data acquisition

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The Method of Single-Segment Layer-by-Layer Substitution for Inverse Design of Passive Magnetic Springs 27

The Method of Single-Segment Layer-by-Layer Substitution for...

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27th International Conference on Electrical Machines and systems, ICEMS 2024

作者： Zhou, Rui Hong, Cailin Fu, Lifeng Zhang, Wei Bai, Yumei Jiang, Wei Wu, Jiulin Huazhong University of Science and Technology State Key Laboratory of Intelligent Manufacturing Equipment and Technology Wuhan China

ISBN: (纸本)9784886864406

Special-shaped magnetic springs (S2MSs), capable of customizing force-displacement relationships, hold the potential to serve a unique function across a multitude of applications. It's feasible to design a parallel or series S2MS with specific force-displacement relationships based on the original features of the mechanism, thereby achieving the desired mechanical response. However, the inverse design of S2MS realized via dual-segment magnetic layer substitution customarily necessitate four to eight custom-shaped permanent magnets (PMs), thereby complexifying the stator's configuration and limiting its application potential. This study investigates the use of a magnetic single-segment layer as an effective substitute for modulating magnets, comparing the impact of optimizing different magnetic layer parameters on the effectiveness of substituting S2MSs. The results indicate that employing the single-segment substitution for inverse design S2MSs facilitates the simplification of manufacturing and assembly processes, while maintaining the long-stroke constant force features. © 2024 The Institute of Electrical Engineers of Japan.

关键词： Permanent magnets

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A Novel Robot Positioning Accuracy Calibration Method Integrating Levenberg-Marquardt and Differential Evolution Algorithm 3

A Novel Robot Positioning Accuracy Calibration Method Integr...

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3rd International Conference on Artificial Intelligence and Computer Information technology, AICIT 2024

作者： Wang, Quan Xu, Wei Li, Wenlong Ding, Han Huazhong University of Science and Technology State Key Laboratory of Intelligent Manufacturing Equipment and Technology Wuhan China

ISBN: (纸本)9798350365443

Industrial robots are widely used in processes such as milling of aircraft skins, where their absolute positioning accuracy plays a crucial role in determining the quality of the machining results. A major factor influencing this accuracy is the robot's kinematic parameters. This paper introduces a refined kinematic error model, free of redundant parameters, built upon the MD-H model and enhanced using the Hash method. It also presents an innovative calibration technique that integrates the Levenberg-Marquardt (LM) algorithm with the Differential Evolution (DE) algorithm. First, the MD-H model is constructed, followed by the development of the error model, with redundant columns eliminated through the Hash method. The LM algorithm is then employed for preliminary parameter identification, generating initial estimates that are further refined using the DE algorithm. By applying this combined approach, the KUKA KR300 R2700 robot achieved an absolute positioning accuracy of 0.3358 mm post-calibration, meeting the stringent precision demands required for milling aircraft skins. © 2024 IEEE.

关键词： Milling (machining)

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Time-Varying Formation Tracking Control of Heterogeneous Multi-Agent systems With Intermittent Communications and Directed Switching Networks

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IEEE/CAA Journal of Automatica Sinica 2025年第1期12卷 294-296页

作者： Yuhan Wang Zhuping Wang Hao Zhang Huaicheng Yan the Shanghai Research Institute for Intelligent Autonomous Systems Tongji University the National Key Laboratory of Autonomous Intelligent Unmanned Systems the Frontiers Science Center for Intelligent Autonomous System of Ministry of Education the College of Electronic and Information Engineering the Department of Control Science and Engineering Tongji University the Key Laboratory of Advanced Control and Optimization for Chemical Processes of Ministry of Education the School of Information Science and Engineering East China University of Science and Technology

Dear Editor,This letter is concerned with the problem of time-varying formation tracking for heterogeneous multi-agent systems(MASs) under directed switching networks. For this purpose, our first step is to present so... 详细信息

关键词： Switches Topology Observers Formation control Event detection Switched systems Multi-agent systems Control theory Autonomous systems Stability

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