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9th Global Conference on Materials science and Engineering, CMSE 2020

作者： Jiang, L. Wu, C.W. Shao, X.J. Zhang, Y. Yu, M.D. National Key Laboratory of Science and Technology on Reactor System Design Technology Nuclear Power Institute of China Chengdu610041 China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian116024 China

To improve energy storage performance of the multi-ring RCP flywheel comprised of inner hub, tungsten alloy ring and outer retainer, optimization design process for the radial thicknesses of components and interference fit assembly is demonstrated. Radial thicknesses of these components and magnitude of interference fit are set as design parameters to construct parametric analysis model. design of experiments (DOE) technique is adopted to generate design matrix for sensitive analysis. Subsequently, radial basis function (RBF) approximation is employed to search for the optimal design considering structural integrity requirement. Finally, a proper range of the magnitude of interference fit is obtained which can not only prevent neither slippage nor separation between the inner hub and tungsten alloy ring but also ensure the safety of structural strength. In addition, it is found that to ensure a high moment of inertia and energy density, a reasonable large radial thickness of tungsten alloy ring and a reasonable small radial thickness of outer retainer are required. © Published under licence by IOP Publishing Ltd.

关键词： Heavy metals

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Feature Pyramid Network Based on Skip Connect for Vehicle Prediction 2

Feature Pyramid Network Based on Skip Connect for Vehicle Pr...

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2nd International Conference on Robotics, Automation and Intelligent Control, ICRAIC 2022

作者： Li, Peixin Liu, Jiaqi Yang, Lu Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology China

The trajectory prediction of the target vehicle can improve the perception ability of autonomous driving vehicles in the open world environment and is an essential technology for realizing high-level fully automatic driving. The traditional vehicle trajectory prediction model based on image input is sensitive to the image style of the dataset and has weak generalization ability. The prediction model based on intermediate features can overcome the problem of different dataset styles. However, there are relatively few explorations on building models based on intermediate semantic features. Inspired by the feature pyramid in image processing, this paper proposes an FPSP (Feature Pyramid network based on Skip connect for vehicle Prediction) network. By adding the pyramid feature branch, the original network is improved. The initial coarse information is hierarchically introduced into corresponding abstract high-dimensional features. Experiments on the KITTI dataset prove that FPSP achieves considerable improvement with only a slight increase in time consumption. © Published under licence by IOP Publishing Ltd.

关键词： Forecasting

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Real Time Surgical Instrument Object Detection Using YOLOv7 1

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6th EAI International Conference on Robotics and Networks, EAI ROSENET 2022

作者： Zheng, Laiwang Liu, Zhenzhong Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin China

ISBN: (数字)9783031338267

ISBN: (纸本)9783031338250

With the rapid development of minimally invasive surgery (MIS) in the medical field, surgical robot technology has developed rapidly. Human-machine combined assisted surgical technology has begun to bring good news to the majority of doctors and patients who need surgery. It has gradually become a common medical treatment. Minimally invasive surgery can overcome the shortcomings of traditional surgery. MIS has the advantages of less trauma, less impact on patients, faster recovery, less intraoperative blood loss, and so on. For surgical robots, surgical instruments are important execution components that have been widely concerned and studied in recent years. One of the core technologies of surgical robots is the detection of surgical equipment based on deep learning, which can effectively assist doctors to complete the surgery. Current surgical instrument detection methods need to be improved in real-time performance and accuracy. Therefore, this paper proposes a new real-time detection algorithm, which is based on the deep learning object detection system YOLOv7. The real dataset, which contained information on seven surgical instruments, was selected for training and validation. Experiments show that the method has good precision, recall rate, and mAP, which can be used to improve the ability of robot-assisted doctors to identify instruments during surgery. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Object recognition

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Mechanically Stable and Damage Resistant Freestanding Ultrathin Silver Nanowire Films with Closely Packed Crossed-Lamellar Structure

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Precision Chemistry 2024年第12期2卷 634-643页

作者： Si-Chao Zhang Huai-Ling Ga Long Zhang Yin-Bo Zhu Ya-Dong Wu Jian-Wei Liu Li-Bo Mao Mei Feng Liang Dong Zhao Pan Xiang-Sen Meng Yang Lu Shu-Hong Yu Department of Chemistry New Cornerstone Science LaboratoryInstitute of Biomimetic Materials&ChemistryAnhui Engineering Laboratory of Biomimetic MaterialsDivision of Nanomaterials&ChemistryHefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsCAS Center for Excellence in Complex System MechanicsUniversity of Science and Technology of ChinaHefei 230027China Anhui Key Laboratory of Controllable Chemical Reaction and Material Chemical Engineering School of Chemistry and Chemical EngineeringHefei University of TechnologyHefeiAnhui 230009P.R.China Institute of Innovative Materials(I2M) Department of ChemistryDepartment of Materials Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China

One-dimensional(1D)functional nanowires are widely used as nanoscale building blocks for assembling advanced nanodevices due to their unique ***,previous research has mainly focused on nanowire functionality,while neglecting the structural stability and damage resistance of nanowire assemblies,which are critical for the long-term operation of *** achieve excellent mechanical stability and damage resistance through sophisticated structural ***,we successfully prepared a mechanically stabilized monolamella silver nanowire(Ag NW)film,based on a facile bubblemediated assembly and nondestructive transfer strategy with the assistance of a porous mixed cellulose ester substrate,inspired by the hierarchical structure of *** to the closely packed arrangement of Ag NWs combined with their weak interfaces,the monolamellar Ag NW film can be transferred to arbitrary substrates without ***,freestanding multilamellar Ag NW films with impressive damage resistance can be obtained from the monolamellar Ag NW film,through the introduction of bioinspired closely packed crossed-lamellar(CPCL)*** CPCL structure maximizes intra-and interlamellar interactions among Ag NWs ensuring efficient stress transfer and uniform electron transport,resulting in excellent mechanical durability and stable electrical properties of the multilamellar Ag NW films.

关键词： Biomimetics hierarchical structure structural stability damage resistance functional nanowire assemblies

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高雷诺数下覆羽控制直翼型流动分离的位置影响实验

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Acta Mechanica Sinica 2024年第4期40卷 125-135页

作者：巩绪安马兴宇姜楠 Department of Mechanics School of Mechanical EngineeringTianjin UniversityTianjin300354China National Key Laboratory of Aerodynamic Noise Control China Aerodynamics Research and Development CenterSichuan621000China National Key Laboratory of Science and Technology on Aerodynamic Design and Research School of AeronauticsNorthwestern Polytechnical UniversityXi’an710072China State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong UniversityChengdu610031China

本文在二维机翼上安装了仿生的覆羽结构,在5.0×105的雷诺数下研究它们控制前缘流动分离的效果.覆羽是指覆盖在鸟类翅膀上的多排短而柔软的带有锯齿状尖端的羽毛.它们覆盖在长而硬的飞羽边缘,使鸟的翅膀保持流线型.当流动分离发生时... 详细信息

本文在二维机翼上安装了仿生的覆羽结构,在5.0×105的雷诺数下研究它们控制前缘流动分离的效果.覆羽是指覆盖在鸟类翅膀上的多排短而柔软的带有锯齿状尖端的羽毛.它们覆盖在长而硬的飞羽边缘,使鸟的翅膀保持流线型.当流动分离发生时,这些柔性锯齿形的人工覆羽在来流的激励下能够自适应地变形和颤振.在风洞实验中,本文使用高时间分辨率的粒子图像测速仪(PIV)来测量机翼上表面的速度场,并使用热线风速仪来测量尾流中的高频湍流脉动.安装在20%弦长处的人工覆羽在前缘分离流的激励下会自适应地大幅翻转.安装在80%弦长处的覆羽则会被尾缘卷起的脱落涡向上抬起,并在准平衡状态下轻微摆动.这两类人工覆羽均能够有效地控制流动分离,并减小尾流的湍流脉动强度.

关键词：流动分离风洞实验分离流湍流脉动高时间分辨率热线风速仪高雷诺数锯齿形

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Research on Parameters Optimum design of Levitation Electromagnet Based on Orthogonal design for EMS Maglev Train 1

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16th Annual Conference of China Electrotechnical Society, ACCES 2021

作者： Yu, Xiwen Wang, Yu Bo, Kai Chen, Junquan Wang, Dong National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan430043 China

ISBN: (数字)9789811918704

ISBN: (纸本)9789811918698

With the commercial success of EMS (Electro-Magnetic Suspension) maglev train, precise modeling and optimization of electromagnetic system is of great significance to the reliability enhancement of existing structure. It has been calculated that the dynamic electromagnetic process of EMS maglev train by finite element simulation in this paper. The influences of typical soft magnetic materials on the floating weight ratio are studied for the EMS levitation electromagnet. It was investigated by orthogonal experimental design method that the key parameters influencing the floating weight ratio of electromagnet. The best combination of the parameters optimum is given to check the correctness through the numerical results. The results show that the order of the floating-weight ratio with different soft magnetic materials is 18RK070 > 30Q130 > 35WW270 > 50WW800 > 1J22. For optimization scheme, the weight of the levitation electromagnet decreases by about 56.99 kg, it can be increased by more than 10% for floating-weight ratio. This study have guiding significance for optimum design of electromagnetic system of EMS maglev trains. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： design

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Multiscale mechanics of noncovalent interface in graphene oxide layered nanocomposites

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Theoretical & Applied Mechanics Letters 2022年第1期12卷 3-9页

作者： ZeZhou He YinBo Zhu HengAn Wu CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsCAS Center for Excellence in Complex System MechanicsUniversity of Science and Technology of ChinaHefei 230027China

Noncovalent interfaces play a vital role in inelastic deformation and toughening mechanisms in layered nanocomposites due to their dynamical recoverability. When interfacial engineering is applied to design layered nanocomposites, shear-lag analysis is usually implemented to evaluate the capability of interfacial loading transfer. Here, we introduce a multiscale shear-lag model that correlates macroscale mechanical properties with the molecular mechanisms to quantify the effects of interfacial configuration in graphene oxide(GO) layered nanocomposites. By investigating the mechanical responses of commensurate and incommensurate interfaces, we identify that the commensurate interface exhibits a pronounced size effect due to the nucleation and propagation of interfacial defects, whereas the incommensurate interface displays uniform deformation. Our predictions are further validated through large-scale molecular dynamics simulations for GO layered nanocomposites. This work demonstrates how size effects and interfacial configurations can be exploited to fabricate layered nanocomposites with superior mechanical properties despite relying on weak noncovalent interfaces.

关键词： Multiscale mechanics Noncovalent interface Commensurate and incommensurate Shear-lag model Layered nanocomposites

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design and Contact Analysis of Mover Locking Device

Design and Contact Analysis of Mover Locking Device

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International Conference on Mechanical design, ICMD 2021

作者： Wu, Xingguang Lu, Lu Xiong, Youxing National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan430033 China

ISBN: (纸本)9789811673801

In response to the repeatable and high-reliability locking requirements of the motor mover in an underwater electromagnetic launching device, a passive mover locking device is designed, which is composed of several spring leaves and locking rings. The functions of unlocking and locking are realized by spring leafs bending deformation. Firstly, the key dimensions of the locking device are preliminarily determined by estimating the unlocking force and the locking force through the superposition method. Then, the working process of the locking device is analyzed by numerical simulation. The results show that the locking device meets the functional requirements and strength requirements, and the normal contact stiffness has little influence on the unlocking force, but a great influence on the contact pressure. The setting of the friction coefficient has a great influence on the unlocking force. Finally, the experimental verification of the unlocking process of the locking device is carried out, and the results show that the relative error between the test unlocking force and the numerical simulation results is 9.60%, indicating that the numerical simulation analysis is reasonable. After 400 unlocking tests, there is no obvious change in the unlocking force. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Friction

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design Method of Human-Computer Interactive Interface of MTS Based on DCS of Nuclear Power Plant 5th

Design Method of Human-Computer Interactive Interface of MTS...

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5th International Symposium on Software Reliability, Industrial Safety, Cyber Security and Physical Protection of Nuclear Power Plant, ISNPP 2020

作者： Dang, Li-Jun Huang, Jun Ye, Qi Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu Sichuan610213 China

ISBN: (纸本)9789811634550

MTS (maintenance and test software), as an important human-computer interactive tool in DCS of nuclear power plant, plays a crucial role in configuration and management of the engineering applied data, engineering design, system debugging and operational maintenance. With the advent of information age, industrial designers pay more and more attention to interactive design, and user attaches increasing importance to the human-machine interactive experience of products, which puts forward new requirements for the human-machine interactive interface of MTS. This paper takes the human-computer interaction visual design of MTS as the core, through analyzing the human-computer interaction model and requirements of MTS, formulates the overall design scheme of the human-computer interaction system of MTS. According to the overall scheme, a set of human-computer interaction visual design method applied to MTS of DCS in nuclear power plant is proposed. The method and criterion of human-computer interaction design proposed in this paper is very important for the design human-computer interaction of nuclear power plant application software, and also points out the direction of human-computer interaction optimization of MTS mentioned in this paper. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Nuclear power plants

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High-Precision Point Cloud Data Acquisition for Robot Based on Multiple Constraints 16th

High-Precision Point Cloud Data Acquisition for Robot Based ...

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16th International Conference on Intelligent Robotics and Applications, ICIRA 2023

作者： Li, Bingbing Zhang, Teng Sun, Hao Deng, Runpeng Peng, Fangyu Yan, Rong Tang, Xiaowei The National NC System Engineering Research Center School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan430074 China The Wuhan Digital Design and Manufacturing Innovation Center Co. Ltd. Wuhan430074 China The State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789819964796

The foundation of high-precision 3D reconstruction is the acquisition of high-precision point clouds. Through multi-view point cloud scanning and alignment, the point cloud of parts can be obtained. The great flexibility of the robot enables it to carry out scanning operations that require multi-view. However, the robots are limited in position error, and the accuracy of the camera varies depending on the range of vision. In addition, the point cloud density is influenced by the curvature of the workpiece, which seriously limits the accuracy of point cloud acquisition and registration. To solve these problems, a method of high-precision point cloud data acquisition for robots based on multiple constraints is proposed. The precision of the measuring system is increased by imposing constraints. So the high-performance field of vision of the camera and the high-performance motion space of the robot are obtained. The effect of workpiece curvature on point cloud scanning is thought to require increased camera viewpoints. After obtaining the camera viewpoints, the moving route planning of the robot is implemented using the ant colony voting method. In this paper, a curved blade experiment was carried out to prove the advantages of our method. It is not necessary for the point cloud overlap rate or the parts with many features. The accuracy of scanned point clouds is 0.249 mm, which is less than the results of using intelligent algorithms and marked points. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Cameras

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