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2017 2nd International Conference on Applied Mechanics, Electronics and Mechatronics Engineering(AMEME 2017)

作者： Ying-tao CHEN Song XIANG Wei-ping ZHAO Kang YANG Faculty of Aerospace engineering Shenyang Aerospace University Liaoning Key Laboratory of Advanced Measurement and Test Technology for Aviation Propulsion System Shenyang Aerospace University Liaoning Key Laboratory of General Aviation Shenyang Aerospace University

Fifth-order shear deformation theory is proposed to analyze the free vibration of functionally graded plates. The present theory satisfies the zero transverse shear stress boundary conditions on the upper and lower surface of plate. The governing differential equations based on present theory are derived. Natural frequencies of simply functionally graded square plates are obtained by an analytical method and compared with the results of available literatures to verify the validity and accuracy of present theory.

关键词： Free vibration Functionally graded plate Fifth-order shear deformation theory Analytical solution Natural frequency

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Flow resistance and heat transfer characteristics for natural circulation flow in a narrow rectangular channel under rolling condition 17

Flow resistance and heat transfer characteristics for natura...

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17th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2017

作者： Tian, Chunping Wang, Jianjun Yan, Changqi Zang, Xiaochuan Wu, Zhenxing Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University HarbinHeilongjiang150001 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing100084 China Shanxi key lab of advanced nuclear energy and technology Xi'an jiaotong university Xi'an710049 China 3A laboratory building 145 nantong street HarbinHeilongjiang150001 China

Experiments for single phase natural circulation flow under rolling motion were performed to reveal the mechanism of the variation in thermal hydraulic performance. The study was conducted in a narrow rectangular channel, at pressure of 0.2 to 0.3 MPa. The subcooling temperature ranged from 50 to 90 K, and heat flux ranged from 30 to 60 kW/m2. With temperature, heating power, pressure drop and mass flux measured, the flow resistance and heat transfer characteristics were studied. The results show that, with the increase of rolling amplitude and frequency, the cycle-average mass flux decreases, and cycle-average friction factor increases. The heat transfer performance is more complex than flow resistance under rolling motion condition, because rolling motion can not only disturb the thermal boundary layer but also reduce the cycle-average mass flux, the former enhances heat transfer, while the later results in heat transfer deterioration. Rolling motion under natural circulation condition will diminish heat transfer in entrance region. © 2016 Association for Computing Machinery Inc. All Rights Reserved.

关键词： Heat flux

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Design and Analysis of All-electric Aircraft Nose Wheel Steering System Based on Intelligent Algorithm

Design and Analysis of All-electric Aircraft Nose Wheel Stee...

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2017 2nd International Conference on Applied Mechanics and Mechatronics Engineering(AMME 2017)

作者： Ming ZHANG Meng-jiao LENG Xin WU Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle Nanjing University of Aeronautics & Astronautics Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration

As all-electric aircraft has many advantages, aircraft nose wheel steering system would be developed to the all-electric direction. Aiming at the control demand of nose wheel steering system, based on the basic principles of nose wheel steering system and the design technique of mechanotronics, an all-electric aircraft nose wheel steering system composed of a nose wheel steering mechanism of two worm gear and a control servo system of fly-by-wire having both steering and anti-shimmy function is designed to meet the demand for operation control in nose wheel steering system. Besides, the fuzzy algorithm and BP neural network algorithm is applied to the control system to explore its algorithm. Then based on Matlab/Simulink and LMS/AMESim software, the united simulation model of the system with fuzzy PID controller is established to make the dynamic simulation analysis for the verification of its steering function, the research results indicate that the nose wheel steering system is reasonable and validated, can meet the requirements of the general project.

关键词： Mechanotronics design United simulation analysis Nose wheel steering system Landing gear

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Improving hazard analysis of integrated modular avionics system based on system-theoretic process analysis 17th

Improving hazard analysis of integrated modular avionics sys...

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17th AIAA aviation technology, Integration, and Operations Conference, 2017

作者： Rong, Hao Gu, Qingfan Chen, Zhixiong Xu, Desheng China National Aeronautical Radio Electronics Research Institute Shanghai China Science and Technology on Avionics Integration Laboratory Shanghai China State Key Laboratory for Civil Aircraft Flight Simulation Commercial Aircraft Corporation of China Ltd No.5188 Jin Ke Road Shanghai China Civil Aviation Department No.432 Zi Yue Road Shanghai China

ISBN: (纸本)9781624105081

Integrated modular avionics systems bring new concepts and benefits for function integration and resource utilization in developing advanced aircraft avionics, as well as a series of challenges related to hazard analysis in components interaction and functions operation. When software applications provided independently by the subsystem developers are integrated onto the IMA hardware platform, it is very difficult for designers to understand and predict how the system will behave and what interaction hazards could occur. Although the ARP 4761-based safety analysis methods have solved a large number of safety problems on the development of civil aircraft and system designs in early times, there are some limitations when analyzing more and more complex integrated modular avionics systems in modern times. To gain a good or better understanding and a comprehensive awareness of applications interaction hazards in today’s more complex, software-intensive IMA systems, it is significant to use a method to consider these new causal factors that are not handled by the older techniques and to provide more guidance to the analyst in performing hazard analysis. System-Theoretic Process Analysis (STPA) is one of typical systemic hazard analysis methods. STPA has its foundation in a new accident causality model called STAMP (System-Theoretic Accident Model and Process). STAMP was proposed based on the cybernetics of systems theory. In STAMP, the dysfunctional interactions and requirements flaws during operation are primary types of inadequate control. The STPA-based hazard analysis method is extended in this paper to account for behavior that emerges when software applications are integrated and make functional interaction. This method will be capable of modeling the new causal factors that contribute to component interaction hazards. The paper illustrates the new method with a case that includes real-world avionics display functions, this application of the proposed method will b

关键词： Hazards

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2d beam profile monitors at CPHS of Tsinghua University 8

2d beam profile monitors at CPHS of Tsinghua University

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8th International Particle Accelerator Conference, IPAC 2017

作者： Wang, M.W. Xing, Q.Z. Zheng, S.X. Guan, X.L. Huang, W.H. Wang, X.W. Lei, Y. Du, L. Qiu, M.T. Wang, Z.M. Key Laboratory of Particle and Radiation Imaging Tsinghua University Beijing100084 China Laboratory for Advanced Radiation Sources and Application Tsinghua University Beijing100084 China Department of Engineering Physics Tsinghua University Beijing100084 China CEA IRFU Gif-sur-Yvette F-91191 France State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology Xi'an710024 China

ISBN: (纸本)9783954501823

Beam profile is a key parameter for high current proton linac. Compact Pulsed Hadron Source(CPHS) has two type of detectors to monitor beam 2D beam profile: scintillator screen and rotatable multi-wire scanner. A retractable chromium-doped alumina (Chromox) screen is used as scintillator, emitted lights when impacted by proton are captured by a 12 bit CCD camera. Nineteen carbon fibre wires with a diameter of 30 μm, 3 mm separated from each other, are used to measure beam 1D distribution. Projection can be measured at different direction by rotating the multi-wire scanner about beam direction. 2D beam distribution is reconstructed from multiple projections with the help of CT. Different CT algorithms, Algebra Reconstruct Technique (ART) and Maximum Entropy algorithm (MENT), are applied to achieve accurate or quick reconstruction. The preliminary experimental results show the two profile monitors working consistently with each other. © 2017 CC-BY-3.0 and by the respective authors

关键词： CCD cameras

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Effect of the processing parameters of the hot rolling of a stainless austenitic steel on the processes of structural and phase transformation

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IOP Conference Series: Materials Science and Engineering 2019年第1期672卷

作者： G I Raab V I Semenov P La S V Dobatkin Institute of Physics of Advanced Materials Ufa State Aviation Technical University 12 K. Marx st. Ufa 450008 Russia State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology Lanzhou China Baikov Institute of Metallurgy and Materials Science RAS 49 Leninskiy pr. Moscow 119334 Russia Institute of Physics of Advanced Materials Ufa State Aviation Technical University 12 K. Marx st. Ufa 450008 Russia National University of Science and Technology 'MISIS' 4 Leninskiy pr. Moscow 119049 Russia

We studied the mechanism of structure formation of the stainless austenitic steel with the composition 0.09%C, 17.5%Cr, 11.6%Ni, 0.5%Ti (a close analogue of the AISI 304 steel) during hot deformation by rolling at a temperature of 900 °C, strain rates of 0.5-5 s−1 and strains of about 10-60%. It was demonstrated that with increasing strain the fraction of polygonized volumes grows, and inside them the fraction of equiaxed subgrains grows.

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Development progress of the 7MeV linac injector for the 200MeV synchrotron of Xi'an proton application facility 8

Development progress of the 7MeV linac injector for the 200M...

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8th International Particle Accelerator Conference, IPAC 2017

作者： Xing, Q.Z. Zheng, S.X. Cheng, C. Du, T.B. Guan, X.L. Zhang, H.Y. Lei, Y. Tang, R. Bi, C.B. Du, C.T. Guo, Q.K. Man, K.D. Wang, D. Tang, C.X. Wang, X.W. Wang, B.C. Qu, E.Y. Yang, Y. Zhao, C. Wang, Z.M. Guan, W.Q. He, Y. Li, J. Key Laboratory of Particle and Radiation Imaging Tsinghua University Ministry of Education Beijing100084 China Laboratory for Advanced Radiation Sources and Application Tsinghua University Beijing100084 China Department of Engineering Physics Tsinghua University Beijing100084 China State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology Xi'an710024 China NUCTECH Co. Ltd. Beijing100084 China

ISBN: (纸本)9783954501823

We present, in this paper, the development progress of the 7MeV Linac for the 200MeV synchrotron of the Xi'an Proton Application Facility (XiPAF). The 7 MeV linac injector is composed of the 50 keV negative hydrogen ion source, Low Energy Beam Transport line (LEBT), 3 MeV four-vane type Radio Frequency Quadrupole (RFQ) accelerator, 7 MeV Alvarez-type Drift Tube Linac (DTL), and the corresponding RF power source system. The 2.45 GHz microwave-driven Cesium-free Electron Cyclotron Resonance (ECR) source and LEBT will be commissioned in this year, and the peak current of the extracted H- beam at the exit of the LEBT is expected to be 6 mA, with the output energy of 50 keV, maximum repetition rate of 0.5 Hz, beam pulse width of 10~40 μs and normalized RMS emittance of less than 0.2 π mm•mrad. Furthermore, the construction status of the RFQ accelerator and DTL accelerator will be presented in this paper. © 2017 CC-BY-3.0 and by the respective authors

关键词： Cyclotrons

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An Method to Quantify Control Rod Worth Uncertainty Propagated from Nuclear Data

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Energy Procedia 2017年 127卷 178-186页

作者： Chen Hao Wenqi Hu Qiang Zhao Fu Li Yan Yu Yizhen Wang Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University Harbin 150001 China Institute of Nuclear and New Energy Technology(INET) Collaborative Innovation Center of Advanced Nuclear Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education Tsinghua University Beijing 100084 China

One of the main issues of nuclear reactor design is the accurate calculation of control rod worth. However, in the calculation results there exists uncertainty inevitably, which is propagated from uncertainty in input parameters, computing models and calculation methods. Therefore, carrying out control rod worth uncertainty quantification is urgent but full of challenges, especially for application of a feasible method for propagating input uncertainties to control rod worth. In this paper, a new uncertainty analysis method for quantifying uncertainty of control rod worth propagated from macroscopic cross sections has been proposed. The basic idea is to use efficient sampling method to propagate nuclear data uncertainties through the function between control rod worth and all macroscopic cross sections. This is done by applying perturbation theory. Numerical results indicate that the new method proposed in this paper is an effective way to quantify uncertainty of control rod worth propagated from nuclear data.

关键词： Control rods worth Uncertainty Perturbation theory Sampling

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Author Correction: Development and clinical deployment of a smartphone-based visual field deep learning system for glaucoma detection

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NPJ digital medicine 2022年第1期5卷 38页

作者： Fei Li Diping Song Han Chen Jian Xiong Xingyi Li Hua Zhong Guangxian Tang Sujie Fan Dennis S C Lam Weihua Pan Yajuan Zheng Ying Li Guoxiang Qu Junjun He Zhe Wang Ling Jin Rouxi Zhou Yunhe Song Yi Sun Weijing Cheng Chunman Yang Yazhi Fan Yingjie Li Hengli Zhang Ye Yuan Yang Xu Yunfan Xiong Lingfei Jin Aiguo Lv Lingzhi Niu Yuhong Liu Shaoli Li Jiani Zhang Linda M Zangwill Alejandro F Frangi Tin Aung Ching-Yu Cheng Yu Qiao Xiulan Zhang Daniel S W Ting State Key Laboratory of Ophthalmology Zhongshan Ophthalmic Center Sun Yat-Sen University Guangzhou People's Republic of China. ShenZhen Key Lab of Computer Vision and Pattern Recognition Shenzhen Institutes of Advanced Technology The Chinese Academy of Sciences Shenzhen People's Republic of China. University of Chinese Academy of Sciences Beijing People's Republic of China. Department of Ophthalmology The First Affiliated Hospital of Kunming Medical University Kunming People's Republic of China. The First Hospital of Shijiazhuang City Shijiazhuang People's Republic of China. gxtykyy@***. Handan City Eye Hospital Handan People's Republic of China. C-MER (Shenzhen) Dennis Lam Eye Hospital International Eye Research Institute of The Chinese University of Hong Kong (Shenzhen) Shenzhen People's Republic of China. The Eye Hospital WMU at Hangzhou Hangzhou People's Republic of China. Department of Ophthalmology The Second Hospital of Jilin University Changchun People's Republic of China. SenseTime Group Limited Hong Kong People's Republic of China. Department of Ophthalmology The Second Affiliated Hospital of Guizhou Medical University Kaili People's Republic of China. Department of Ophthalmology The Second Affiliated Hospital of Xi'an Jiaotong University Xi'an People's Republic of China. Department of Ophthalmology The Third Affiliated Hospital of Nanchang University Nanchang People's Republic of China. The First Hospital of Shijiazhuang City Shijiazhuang People's Republic of China. Hamilton Glaucoma Center Shiley Eye Institute Viterbi Family Department of Ophthalmology UC San Diego La Jolla CA United States. CISTIB Center for Computational Imaging and Simulation Technologies in Biomedicine Schools of Computing and Medicine University of Leeds Leeds UK. Singapore Eye Research Institute and Singapore National Eye Centre Singapore Singapore. ShenZhen Key Lab of Computer Vision and Pattern Recognition Shenzhen Institutes of Advanced Technology The Chinese Academy of Sci

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Functionalization of Nylon Fabrics with Dopamine Deposition and TiO2 Nanoparticles Immobilization

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Journal of Donghua University(English Edition) 2017年第1期34卷 82-85页

作者：范佳娜张梅伍静娇邱夷平沈丽刘万双蒋秋冉 College of Textiles Donghua University Shanghai 201620 China Key Laboratory of Textile Science & Technology Ministry of Education Donghua University Shanghai 201620 China Shanghai Key Laboratory of Advanced Micro & Nano Textile Materials Shanghai 201620 China College of Chemistry Chemical Engineering and Biotechnology Donghua University Shanghai 201620 China Collaborative Innovation Center for Civil Aviation Composites Donghua University Shanghai 201620 China

Ultraviolet(UV)radiation can cause degradation or aging of many polymers and shorten the working-life of their ***,UV protective covers are required in various *** with the UV-shielding function possess unique properties compared with those covers in board or film ***_2 nanoparticles(NPs),which were reported to have superior UV blocking function,can be used to produce UV protective covers in combination with ***,efficient and environmentally friendly immobilization of TiO_2 Nps onto the fabrics is ***(PDA),a biomimetic synthetic polymer,has attracted great attentions recently due to its superior affinity to various materials and facile application ***,in this research,the surface of nylon fabrics was modified by PDA to immobilizeTiO_2 *** systematically *** immobilization of the NPs was confirmed by Fourier transform infrared spectrometer(FTIR)and scanning electron microscope(SEM).The functionalized nylon fabrics were proved to exhibit improved UV protection properties even after *** work provides a new and versatile surface modification technique for textiles.

关键词： polydopamine(PDA) nylon fabric TiO2 nanoparticles(NPs) UV protection functionalization

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