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IEEE International Conference on Mechatronics and Automation

作者： Xiaoliang Jin Shuxiang Guo Jian Guo Peng Shi Dapeng Song Faculty of Engineering and Design Kagawa University 2217-20 Hayashi-cho Takamatsu Kagawa Japan Key Laboratory of Convergence Medical Engineering System and Healthcare Technology the Ministry of Industry and Information Technology School of Life Science Beijing Institute of Technology Beijing China Tianjin Key Laboratory for Control Theory and Application in Complicated Systems and Intelligent Robot Laboratory Tianjin University of Technology Tianjin China

ISBN: (数字)9781728164168

ISBN: (纸本)9781728164175

In the research of vascular interventional surgery robotic system, the force information acquisition of surgical tools (guidewires and catheters) has a significant affect on the safety of surgery, especially the contact force between the catheter tip and vascular wall. Therefore. In order to obtain this contact force, we noticed the pressure sensitive rubber because of its piezoresistive effect and easy processing into any shape. a force sensor based on the pressure sensitive rubber was developed in this paper. Once a force is applied on the force sensor attached to the catheter tip, the contact force can be approximated by the piezoresistive effect of the pressure sensitive rubber. The feasibility of the developed force sensor was verified by the experiments in “Vitro”. And the results showed that the force sensor was developed in this paper can accurately detect the contact force between the catheter tip and vascular wall at different positions in the vascular model, the extraction of contact force information of catheter tip is of great significance to the safety of surgery, and the application potential of pressure sensitive rubber.

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The design of High-temperature Permanent Magnet Synchronous Motor based on Multi-physics Simulation

The Design of High-temperature Permanent Magnet Synchronous ...

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International Conference on Power Electronics and Motion Control (IPEMC)

作者： Yu Gao Zhenyang Hao Qiang Zhou Long Wang Yuqi Jia Wenjun Cui Yuliang Lu College of Automation Nanjing University of Aeronautics and Astronautics Nanjing China The Sixty-third Research Institute National University of Defense Technology Nanjing China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration AVIC Nanjing Engineering Institute of Aircraft System Nanjing China

ISBN: (数字)9781728153018

ISBN: (纸本)9781728153025

The development of power electronics technology has made it possible for all-electric combat vehicle (AECV). The high-voltage power supply system, high-temperature working environment and high power density requirements of AECV bring new challenges to the design of the permanent magnet synchronous motor (PMSM). In this paper, the electromagnetic design and thermal design of PMSM for AECV are taken as the research object. A high-speed PMSM with rated power of 1.5kW and rated speed of 18000r/min is designed. In order to accurately calculate the losses in the PMSM under the space vector pulse width modulation (SVPWM) voltage, this paper uses a multi-physics simulation method. Finally, electromagnetic simulation and thermal simulation of the motor are carried out. The results show that the motor meets the design requirements.

关键词： Space vector pulse width modulation Power system measurements Power supplies Permanent magnet motors Synchronous motors Power electronics Electromagnetics

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design and polarization scattering characteristics of L-shape reflector

TechRxiv

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TechRxiv 2020年

作者： Bai, Xiaokai Wang, ZhanLing Huang, Jiankai Pang, Chen Li, Jianbing Li, Yongzhen State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System College of Electronic Science and Engineering National University of Defense Technology Hunan Changsha410073 China

This paper presents a new L-shape reflector to enhance the cross-polarization radar cross section (RCS). Cross-polarization component can increase the jamming effect against the polarization radars. Such L-shape reflectors can also be used as radar tags in cars, books and so on for radar target detection. By bending the structure of traditional dipole reflector to L shape, the direction of surface current is changed, which produces the cross-polarization component. We have simulated L-shape reflector with different lengths of branches in X-band. Compared with the scattering characteristics of traditional dipole reflector, the linear depolarization ratio (LDRvh ) of the L-shape reflector can be easily controlled by changing the length of two branches. © 2020, CC BY.

关键词： Radar cross section

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Development of three-dimensional neutron kinetics code based on high order nodal expansion method in hexagonal-Z geometry 26

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2018 26th International Conference on Nuclear Engineering, ICONE 2018

作者： Chao, Guo Yu, Liu Hangxing, He Luguo, Liu Xiaoyu, Wang Sufang, Xin Peiying, Li Xiaoli, Wu Hongsheng, Yuan Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China

ISBN: (纸本)9780791851456

To solve three-dimensional kinetics problems, a high order nodal expansion method for hexagonal-z geometry(HONEM) and a Runge-Kutta (RK) method are respectively adopted to deal with the spatial and temporal problem. In the HONEM, 1D partially-integrated flux are approximated by using four order polynomial. The two order polynomial is adopted to the approximation of partially-integrated leakages. The Runge-Kutta method is adopted as a tool for dispersing the time term of 3D kinetics equation. A flux weighting method (FWM) is used for obtaining homogenized cross sections of mix node. The three-dimensional hexagonal kinetics code has been developed based on this method and tested with two benchmark problems of VVER which are the control rod ejection without any feedback and with simple adiabatic Doppler feedback. The results calculated by this code agree well with the reference results and the code is validated. Copyright © 2018 ASME.

关键词： Runge Kutta methods

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Multiple branches coupling property and design of PRHRs

Multiple branches coupling property and design of PRHRs

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2018 Transactions of the American Nuclear Society, ANS 2018 and Embedded Topical Meeting Nuclear Fuels and Structural Materials

作者： Zhuohua, Zhang Xu, Ran Feng, Li Lin, Xian Ke, Zhou Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China

Nuclear reactor applied on ship or floating platform recommend miniaturization and optimization of PRHRs. Due to much larger volume and heat transfer area in PRHRs heat exchanger, miniaturization and design of PRHRs need consider many constraints such as volume and systems configuration in containment. In normal reactor design such constraints are not so rigorous, but in reactor design for floating platform it takes significant difficulties. A multiple branches coupling system is constructed in the paper which describes the actual relationship between PRHRs and other systems or equipment, and by combining temperature distribution in heat exchanger and conservation equations of coupling system, the design parameters set satisfied design requirement can be calculated and optimization of design can be completed by programming solving method. Copyright © 2018 AMERICAN NUCLEAR SOCIETY, INCORPORATED, LA GRANGE PARK , ILLINOIS 60526Printed in USA.

关键词： Heat transfer

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Cracking cause analysis of a baffle of the inlet guide vane in an aeroengine

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Engineering Failure Analysis 2025年 179卷

作者： Zhang, Jun Fang, Teng Liu, Weidong Xiao, Jiulin Wang, Juan Peng, Jinfang Liu, Jianhua Zhu, Minhao Tribology Research Institute State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong University Chengdu610031 China Metrology and Physical-Chemical Center AECC Aero Science and Technology Co. LTD. Chengdu610503 China Design Center AECC Chengdu Engine Co. LTD. Chengdu610503 China State-owned Chuanxi Machine Factory Chendu611930 China Key Laboratory of Advanced Technologies of Materials of Ministry of Education Southwest Jiaotong University Chengdu610031 China

Riveting technology is extensively employed in thin-walled structural connections of aircraft. However, the clamped areas of the riveted connections are susceptible to fretting damage under alternating load. This paper focuses on the baffle cracking problem of an inlet guide vane in an aero-engine during the bench test. The failure mechanisms and root causes of the cracks were comprehensively investigated through stereomicroscopy, fractographic analyses, metallographic examination, chemical composition analysis, mechanical testing, and finite element simulations. The results show that the baffle conforms to TA21 titanium alloy specifications. Fretting fatigue in the clamped area at the rivet-hole interface was identified as the primary cause of the baffle's premature cracking. Meanwhile, finite element analyses further reveal that cracks originating within the clamped areas of the baffle correlate with localized von-Mises stress concentrations induced by the riveting process and exacerbated by the first-order bending vibration of the inlet guide vane. © 2025

关键词： Bending tests

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Modulation of stem cells from apical papilla using direct current electric fields: A pathway toward translational dentin regeneration

Translational Dental Research

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Translational Dental Research 2025年第2期1卷

作者： Xiaolin Li Yu Gu Jingyi Li Yan Wang Qian Liu Lihong Qiu Alastair J. Sloan Fa-Ming Chen Xu Chen Bing Song Department of Endodontics School and Hospital of Stomatology Liaoning Provincial Key Laboratory of Oral Diseases China Medical University Shenyang 110002 China School of Biomedical Engineering Shenzhen University of Advanced Technology Shenzhen Guangdong 518107 China Morrello Clinic Neuro Rehabilitation and Neuro Physiotherapy Newport NP18 2LH UK Center for Translational Medicine Research and Development Institute of Biomedical and Health Engineering Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen Guangdong 518055 China Department of Dermatology The First Hospital of China Medical University National Health Commission Key Laboratory of Immunodermatology Key Laboratory of Immunodermatology of Ministry of Education Shenyang 110001 China Melbourne Dental School Faculty of Medicine Dentistry and Health Sciences University of Melbourne Melbourne VIC 3035 Australia Department of Pediatric Dentistry School and Hospital of Stomatology Liaoning Provincial Key Laboratory of Oral Diseases China Medical University Shenyang 110002 China State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration National Clinical Research Center for Oral Diseases Shaanxi International Joint Research Center for Oral Diseases Department of Periodontology School of Stomatology The Fourth Military Medical University Xi'an 710032 China Key Laboratory of Biomedical Imaging Science and System Chinese Academy of Sciences and State Key Laboratory of Biomedical Imaging Science and System Shenzhen Guangdong 518055 China

Dentin is produced by odontoblasts, which originate from mesenchymal cells in the dental papilla. Although numerous studies have explored the molecular switches involved in the differentiation of stem cells from apical papilla (SCAP), little is known about the involvement of electric signals in this process. Recent advances indicate that injured dentin generates an electric current. Therefore, it is essential to evaluate whether the extracellular electrical environment surrounding SCAP in the damaged root can promote tissue repair and regeneration. This study aims to investigate the regulatory effects of direct current electric fields (DCEFs) on SCAP, with the potential to contribute to innovative strategies for tooth regeneration. These strategies include the construction of in vitro models for mechanistic studies, the design of piezoelectric hydrogels for pulp regeneration, the development of novel dental pharmaceuticals, and the development of new clinical treatment techniques.

关键词： Direct current electric fields Stem cells from apical papilla Migration Proliferation Cell differentiation Electric microenvironment

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Preliminary study on few group cross section representation method based on model tree algorithm

Preliminary study on few group cross section representation ...

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

作者： Zhao, Wenbo Ju, Haitao Yu, Yingrui Chai, Xiaoming Yu, Junchong Peng, Xingjie Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China

ISBN: (纸本)9781713808510

The tabular representation of few-group cross section is widely used for node wise two-step core simulations. However, it may take too much memory usage for pin-by-pin two-step simulations. A few-group cross section representation method for PWR has been developed to reduce memory usage in this paper. The few-group cross sections are represented as the sum of a base term and a collection of partial terms. Each of these terms is fitted by modified model tree. The case matrix of training data set is similar with that of the conventional methods such as the piece wise interpolation and the tabular representation. Two modifications have been made for the model tree algorithm: 1) burnup is the only variable to split data set, 2) linear regression method on nodes of the tree is replaced with polynomial fitting method according to priori knowledge of the relationship between cross sections and state variables. Through the modifications accuracy and generalization ability are achieved without the pruning procedure. Then the lattice calculations for test data set could be canceled. Tests on the typical PWR lattice are performed. Numerical results show that for the worst case the memory usage of this method is less than 30% of the tabular representation, when the maximum error of reactivity is less than 500 pcm. The memory usage for other cross sections is less than 10% with high accuracy. Optimization of the target tolerance criteria should be tested for fast group cross sections. Large errors in thermal group absorption and fission production cross sections lead to large errors in Kinf and it needs more study on regression model. The method combined with the tabular representation might be more suitable for the pin-by-pin two-step simulations. © 2018 International Conference on Physics of reactors, PHYSOR 2018: reactor Physics Paving the Way Towards More Efficient systems. All rights reserved.

关键词： Errors

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Maap5 simulation of pwr high-pressure core melting severe accident due to smallbreak loca

Maap5 simulation of pwr high-pressure core melting severe ac...

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2018 International Congress on Advances in Nuclear Power Plants, ICAPP 2018

作者： Wu, Xiaoli Li, Wei Deng, Jian Deng, Chunrui Hou, Liqiang Zhang, Dan Yuan, Hongsheng Science Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China

ISBN: (纸本)9780894487552

MAAP5 is capable of simulating the whole response of a PWR nuclear power plant under severe accident conditions. An analysis of the severe accident scenarios in a PWR by MAAP5 were carried out. It was assumed that the severe accident was initiated by an unusual smallbreak loss-of-coolant accident (SBLOCA) at the reactor pressure vessel (RPV) lower head and the failure of highpressure injection system (HPIS) in a PWR by using MAAP5 were carried out. Different break sizes with and without manual depressurization of the reactor coolant system (RCS) were studied. The results showed that without manually depressurization the RCS, reactor core underwent slow heatup and completely melted and eventually failed the RPV lower head at the primary system pressure of 6.87 MPa for 0.4-inch-break LOCA and 2.71 MPa for 1.0-inch-break LOCA. On the other hand, timely manually opening the pressurizer (PZR) safety valves (SVs) was an effective mitigation measure to recover the core coolabilty by cold-leg accumulator injection system (AIS) and low-pressure injection system (LPIS). Besides, reasonably manually opening the steam generators (SGs) SVs while keeping the auxiliary feedwater work also helped to depressurize the RCS and prevent the severe accident. Both of the two mitigation measures successfully prevented the core from complete melt, but the latter one is preferable to the former one provided no steam generator tube rupture took place. © 2018 American Nuclear Society. All rights reserved.

关键词： Loss of coolant accidents

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Unified Rendering Array Driver Runtime Optimization for Graphic Application 6

Unified Rendering Array Driver Runtime Optimization for Grap...

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6th Annual 2018 International Conference on Geo-Spatial Knowledge and Intelligence, GSKI 2018

作者： Ma, Chengcheng Tian, Ze Liu, Honghong Nie, Zhao China Aeronautical Computing Research Institute China Aviation Key Laboratory of Science and Technology on Integrated Circuit and Micro-System Design P.O. Box 710068 China Xiangteng Microelectronics Technology Co. LTD P.O. Box 710068 China

As the core of GPU processing, the performance of Unified rendering array is directly affected by the shader driver. On the basis of research the structure of Unified rendering array processing, this paper proposes a runtime Unified rendering array driver optimization method for graphical application, can according to different graphics application scenario runtime to generate optimized Unified rendering array driver, testing on graphics processors FPGA verification environment, driven by the runtime optimization compared with the traditional full function driver, performance increased by 55% - 270%. © Published under licence by IOP Publishing Ltd.

关键词： Array processing

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