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Ratcheting Behavior of SA508-3 Steel at Elevated Temperature:Experimental Observation and Simulation

Acta Metallurgica Sinica(English Letters) 2017年第9期30卷 822-828页

作者： Jun Tian Yu Yang Li-Ping Zhang Xue-Jiao Shao Juan Du Qian-Hua Kan Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong University

A series of monotonic uniaxial tensile tests, strain-controlled and stress-controlled cyclic tests of SA508-3 steel were conducted from 25 to 350℃. Results showed that the steel exhibited temperature-dependent cyclic softening characteristic and obvious ratcheting behavior, and dynamic strain aging was observed in the range of 250-350℃. Based on experimental observations, a temperature-dependent cyclic plastic constitutive model was proposed by introducing the nonlinear cyclic softening and kinematic hardening rules, and the dynamic strain aging was also considered into the constitutive model. Comparisons between experiments and simulations were carded out to validate the proposed model at elevated temperature.

关键词： Ratcheting Constitutive model Dynamic strain aging Cyclic loading Elevated temperature

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Optimization of Machining Parameters of SiC Single Crystal Cut by Diamond Wire Saw 2

Optimization of Machining Parameters of SiC Single Crystal C...

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2nd International Conference on Electronic Information technology and Computer Engineering, EITCE 2018

作者： Li, Lun Yang, Shaodong Li, Jishun School of Mechatronics Engineering Henan University of Science and Technology Luoyang471003 China Henan Key Laboratory for Machinery Design and Transmission System Henan University of Science and Technology Luoyang471003 China

For the process of optimizing the process parameters in the process of cutting the hard and brittle materials such as single-crystal SiC by diamond wire saw, the process parameters such as wire saw speed, workpiece feed speed and workpiece rotation speed are the design variables, and the sawing force and surface roughness are the processing targets by orthogonal experimental design. The grey system theory is introduced to optimize the multi-objective cutting process. According to the experimental data, the grey correlation resolution coefficient is determined. The significant relationship between the processing parameters and the target characteristics is analyzed. The optimal combination of process parameters under multi-target conditions is obtained, namely the workpiece feed rate is 0.025mm/min, the wire saw speed is 1.6m/s, and the workpiece rotating speed is 16r/min. © The Authors, published by EDP sciences, 2018.

关键词： Sawing

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Subcooled boiling natural convective two-phase CFD simulation and application

Subcooled boiling natural convective two-phase CFD simulatio...

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International Topical Meeting on Advances in Thermal Hydraulics 2018, ATH 2018 - Held in conjunction with the 2018 American Nuclear Society (ANS) Winter Meeting

作者： Li, Songwei Puragliesi, Riccardo Adamsson, Carl Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Box 436 Chengdu China Paul Scherrer Institut Villigen5232 Switzerland Vattenfall Nuclear Fuel AB Stockholm Sweden

This Paper presents sub-cooled boiling two-phase natural convective using computational fluid dynamics(CFD) model for the application to the passive residual heat removal system of boiling water reactor. Sensitivity studies on meshing scheme, grid size, as well as time step are also performed in previous study to minimize the influence of numerical discretization. Comparison between single/ two-phase CFD model proved the necessity of two-phase CFD model as it can reasonably predict the temperature jump observed in the experiment which could not be reproduced by single phase CFD model. Discrepancy between numerical simulation and experiment data due to the choice of different turbulent models and CFD software’s simulation results are also discussed in order to verify the best practice for this simulation.. The calculation shows that the the temperature distribution, bubble appearance time and locus predicted by the two-phase CFD simulation for sub-cooled boiling natural convective is well consistent with experiment data, which confirms the numerical calculation creditability and accuracy and the possibility for developing new heat transfer model using such methodology is reasonably suggested.. Base on the built two-phase CFD simulation method, transient characteristics of passive residual heat removal system for ESBWR（Economic Simplified Boiling Water reactor）is simulated and a promising tank temperature distribution is obtained compared with experiment data, which further strengthen the confidence of engineering application of two-phase CFD model on prediction of natural circulation heat transfer characteristic of passive residual heat removal system. © 2018 International Topical Meeting on Advances in Thermal Hydraulics, ATH 2018 - Embedded Topical Meeting. All rights reserved.

关键词： Computational fluid dynamics

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Visual Detection Method for Spatial Transverse Vibration Displacement of Wire Rope in Multi-point Synchronous Hoisting system

Visual Detection Method for Spatial Transverse Vibration Dis...

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Chinese Automation Congress (CAC)

作者： Nana Fan Fang Yang Jishun Li Shengyong Zou Henan Key Laboratory for Machinery Design and Transmission System School of Mechatronics Engineering Henan University of Science and Technology Luoyang China Henan Key Laboratory for Machinery Design and Transmission System State Key Laboratory of Mining Heavy Equipment(CITIC-Heavy Industries Co. Ltd) Luoyang China Henan Key Laboratory for Machinery Design and Transmission System School of Mechatronics Engineering Henan University of Science and Technology State Key Laboratory of Mining Heavy Equipment(CITIC-Heavy Industries Co. Ltd) Luoyang China State Key Laboratory of Mining Heavy Equipment(CITIC-Heavy Industries Co. Ltd) Luoyang China

In order to detect the healthy running state of wire rope efficiently and accurately in multi-point synchronous hoisting system, this paper proposed a method based on orthogonal image technology to detect the spatial transverse vibration displacement of wire rope. Firstly, two sets of images were captured synchronously at the same frequency by two high-speed video cameras where set vertically each other. Secondly, binarization and calculation of actual vibration displacement of wire rope were carried out with LabVIEW, and recording the real-time vibration of wire rope. At last, empirical mode decomposition method was used to remove the periodic excitation caused by the displacement of rope-arranging. The spatial vibration shape of the wire rope and the vibration trajectory in the cross section of the wire rope were obtained by fitting these data on Matlab. The experimental results show that this method can accurately reflect the law of the spatial transverse vibration of wire rope. It can provide technical support for the study of the detection and evaluation of the safety parameters of the hoisting system.

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Capacity improvement for mixed traffic flow by installing vehicle-to-vehicle devices on partial human-driven vehicles to serve connected automated vehicles

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Physica A: Statistical Mechanics and its Applications 2025年 674卷

作者： Yan Wang Yanyan Qin Zhongbin Luo Hao Wang Chongqing Key Laboratory of Intelligent Integrated and Multidimensional Transportation System Chongqing Jiaotong University Chongqing 400074 China School of Traffic and Transportation Chongqing Jiaotong University Chongqing 400074 China College of Computer Science Chongqing University Chongqing 400044 China China Merchants Chongqing Communications Reseach & Design Institute Co. Ltd. Chongqing 400067 China Transportation Industry R&D Center for Autonomous Driving Technology Chongqing 400067 China Jiangsu Key Laboratory of Urban ITS Southeast University Nanjing 211189 China Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies Nanjing 211189 China School of Transportation Southeast University Nanjing 211189 China

Vehicle-to-vehicle (V2V) communication technology in connected automated vehicles (CAVs) substantially improves traffic capacity. During initial CAV deployment phases, mixed traffic flow combining CAVs and human-driven vehicles (HVs) will inevitably co-exist on highways. The absence of V2V capabilities in HVs prevents them from providing V2V services to CAVs, thereby constraining CAVs’ capacity improvement in mixed traffic environments. To address this limitation, we propose equipping partial HVs with V2V communication devices, enabling these retrofitted HVs to transmit V2V information and create essential communication environment for CAVs. This study develops a mixed traffic capacity analysis framework that simultaneously incorporates CAV penetration rate and V2V installation rate of HVs, which aims to improve mixed traffic capacity by adjusting the V2V installation rate of HVs. Firstly, we classified car-following patterns within mixed traffic flow and calculate their probabilities. Secondly, a mixed traffic capacity model was constructed using fundamental diagram theory. Using the established model, critical values for V2V installation rate of HVs were analytically derived to achieve capacity improvements under varying CAV penetration rates. Finally, numerical experiments validated both the model’s reliability and theoretical derivations. Results demonstrate that the proposed model effectively quantifies how CAV penetration rate and V2V installation rate of HVs jointly influence mixed traffic capacity. Strategic adjustment of V2V installation rate of HVs based on each level of CAV penetration rates significantly enhances mixed traffic capacity.

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Inchworm-inspired soft climbing robot using microspine arrays

Inchworm-inspired soft climbing robot using microspine array...

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2019 IEEE/RSJ International Conference on Intelligent Robots and systems (IROS)

作者： Qiqiang Hu Erbao Dong Gang Cheng Hu Jin Jie Yang Dong Sun CAS Key Laboratory of Mechanical Behavior and Design of Materials University of Science and Technology of China Hefei China CAS Key Laboratory of Mechanical Behavior and Design of Materials University of Science and Technology of China Hefei PRC Anhui Beijing Key Laboratory of Intelligent Space Robotic Systems Technology and Applications Beijing Institute of Spacecraft System Engineering Beijing PRC Department of Biomedical Engineering City University of Hong Kong Hong Kong SAR

Animals in nature, such as geckos, inchworms, and felines can climb on various surfaces using different mechanisms and serve as references for the study of bio-inspired robots. This paper presents an inchworm-inspired climbing robot that consists of soft body and feet. The soft robot is actuated by shape memory alloy wires and utilizes microspine arrays to attach its feet to rough or soft surfaces. A series of experiments to test the functionality of the feet and torso of the designed robot have verified the theoretical feasibility of the robot. Results have shown that the designed bio-inspired robot can climb on inclined or vertical curved surfaces and flat surfaces. The robot can also adapt to the underwater environment. Thus, this robot has great potential for various applications such as pipeline inspection.

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Research on Quantification Method of Maize Leaf Phenotype Parameters Based on Machine Vision

Research on Quantification Method of Maize Leaf Phenotype Pa...

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Computer Engineering and Intelligent Communications (ISCEIC), International Symposium on

作者： Wang Jinyong Tan Wenrong Hou Shuaimin Wang Yang Zhang Hongna School of Computer Science and Technology Southwest Minzu University for Nationalities China (or P. R. China) Key Laboratory of Computer System National Civil Committee Southwest Minzu University for Nationalities China Inner Mongolia Electric Power Survey and Design Institute Co. Ltd. China School of Computer Science and Technology Southwest Minzu University for Nationalities China Inner Mongolia Qingcheng Urban and Rural Construction Research Institute China

ISBN: (数字)9781728181714

ISBN: (纸本)9781728181721

This paper aims to obtain a model (method) for monitering the growth of corn automatically and accurately. The latest computer vision technology is applied to calculate the method of extracting the surface characteristic parameters. Binocular vision technology is used to calculate the 3D point cloud of maize image. Meanwhile, the 3D point noise reduction established by bilateral filtering is adopted to establish the 3D reconstruction model of maize. In the 3D model, the height and width of maize are calculated proportionally. The error rate of the proposed method is 0.52%. This work provides a reference for the growth monitoring and virtual growth of corn.

关键词： Image segmentation Cameras Three-dimensional displays Fitting Mathematical model Agriculture Error analysis

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Processing of a comprehensive windowed multipole library via vector fitting

Processing of a comprehensive windowed multipole library via...

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2018 International Conference on Physics of reactors: reactor Physics Paving the Way Towards More Efficient systems, PHYSOR 2018

作者： Liang, Jingang Peng, Xingjie Liu, Shichang Josey, Colin Forget, Benoit Smith, Kord Department of Nuclear Science and Engineering Massachusetts Institute of Technology CambridgeMA02139 United States Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China ChengduSichuan610000 China Department of Engineering Physics Tsinghua University Beijing100084 China

ISBN: (纸本)9781713808510

The windowed multipole method is a promising technique to efficiently perform Doppler broadening of nuclear cross section data and has so far been based on the conversion of resolved resonance parameters to the pole representation. However, 40% of ENDF/B-VII. 1 nuclides cannot be directly converted in windowed multipole format because some nuclides are provided directly as point-wise data in the evaluation or the presence of non-smooth point-wise data that prevents the transformation. A new approach based on Vector Fitting technique was recently investigated to convert point-wise cross section data to poles and residues. This paper presents a generalized Vector Fitting algorithm which is able to generate optimized multipole parameters from ENDF point-wise data and applicable to a wide range of nuclides. Using this algorithm, a comprehensive windowed multipole library which contains all ENDF/B-VII.l nuclides was produced for the first time. Accuracy of the library was demonstrated by microscopic cross section comparisons at different temperatures, and calculation results of the BEAVRS benchmark were performed to demonstrate its applicability to realistic problems. © 2018 International Conference on Physics of reactors, PHYSOR 2018: reactor Physics Paving the Way Towards More Efficient systems. All rights reserved.

关键词： Doppler effect

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Research on Active Disturbance Rejection Control Method for Electro-hydraulic Servo Loading system with Considering Clearance Disturbance

Research on Active Disturbance Rejection Control Method for ...

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International Conference on Fluid Power and Mechatronics (FPM)

作者： Qiang Chen Fang Yang Dan-dan LIU Yu-jun Xue School of Mechatronics Engineering Henan University of Science & Technology Luoyang China Henan Key Laboratory of Mechanical Design and Transmission System Henan University of Science & Technology Luoyang China Luoyang LYC Rearing Co. Ltd Luoyang China

ISBN: (数字)9781728103112

ISBN: (纸本)9781728103129

In the test of high-speed rail bearings, the electro- hydraulic servo-loading system is commonly used to simulate the actual alternating loading for the bearing. Due to the existence of the loading mechanism clearance and the transmission shaft system matching clearance, the loading system has a certain nonlinear displacement disturbance. Combined with the nonlinear characteristics of the electro-hydraulic servo system, the dynamic response characteristics and steady-state control accuracy of the force loading are seriously affected. To this end, the Active Disturbance Rejection control (ADRC) method is used to identify and compensate the gap disturbances using the feedback information of the extended state observer, and the tracking differentiator and feedback control rate are designed to improve the system response speed and suppress overshoot. The control method is applied to the control model of high-speed rail bearing electro-hydraulic servo-loading system. The simulation results show that the control method can achieve good control effect, and the anti-disturbance capability, response speed and steady-state performance of the system are significantly improved.

关键词： Loading Force Servomotors Laser excitation Electron tubes Hydraulic systems Pressure sensors

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Recent development of chemically complex metallic glasses:from accelerated compositional design,additive manufacturing to novel applications

材料展望（英文）

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材料展望（英文） 2022年第1期 9-31页

作者： J Y Zhang Z Q Zhou Z B Zhang M H Park Q Yu Z Li J Ma A D Wang H G Huang M Song B S Guo Q Wang Y Yang Department of Mechanical Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongPeople's Republic of China Shenzhen Key Laboratory of High Performance Nontraditional Manufacturing College of Mechatronics and Control EngineeringShenzhen UniversityShenzhenGuangdong 518060People's Republic of China School of Materials Science and Engineering Dongguan University of TechnologyDongguanGuangdong 523808People's Republic of China Institute of Materials China Academy of Engineering PhysicsJiangyouSichuan 621907People's Republic of China State Key Laboratory of Powder Metallurgy Central South UniversityChangshaHunan 410083People's Republic of China Department of Mechanical Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongPeople's Republic of China Institute of Advanced Wear & Corrosion Resistant and Functional Materials Jinan UniversityGuangzhouGuangdong 510632People's Republic of China Institute of Materials Laboratory for MicrostructuresShanghai UniversityShanghai 200444People's Republic of China Department of Mechanical Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongPeople's Republic of China Department of Materials Science and Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongPeople's Republic of China Department of Advanced Design and System Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongPeople's Republic of China

Metallic glasses(MGs)or amorphous alloys are an important engineering material that has a history of research of about 80-90 *** different fast cooling methods were developed for multi-component MGs between 1960s and 1980s,1990s witnessed a surge of research interest in the development of bulk metallic glasses(BGMs).Since then,one central theme of research in the metallic-glass community has been compositional design that aims to search for MGs with a better glass forming ability,a larger size and/or more interesting properties,which can hence meet the demands from more important *** this review article,we focus on the recent development of chemically complex MGs,such as high entropy MGs,with new tools that were not available or mature yet until recently,such as the state-of-the-art additive manufacturing technologies,high throughput materials design techniques and the methods for big data analyses(*** learning and artificial intelligence).We also discuss the recent use of MGs in a variety of novel and important applications,from personal healthcare,electric energy transfer to nuclear energy that plays a pivotal role in the battle against global warming.

关键词： metallic glasses amorphous alloys alloy design additive manufacturing machine learning high throughput materials design

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