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23rd International Conference on Nuclear Engineering: Nuclear Power - Reliable Global Energy, ICONE 2015

作者： Ran, Fu Dan, Wu Ding, Shuhua Qian, Peng Libo, Qian Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu Sichuan China Nuclear Power Institute of China Chengdu Sichuan China

ISBN: (纸本)9784888982566

The SGTR studies correspond to the double-ended guillotine rupture of a steam generator tube, which allows unimped blowdown from both ends of the severed tube. Occurrence of the SGTR a ccident leads to an inc rease in contamination of t he secondary system as well as activ ity release to atmosphe re due to leakage of radioactive coolant from the RCS. The refore the au tomatic or operator actions should be taken in tim e to terminate the leakage. For ACP1000, the ti me window of the operator action is prolonged by adding new protection signals and equipment. In present work, the maximal time interval of th e operator action after t he SGTR is studied with these new m easures. And after the operator takes actions, in accordance with the procedure, no SG overflow takes place till the pressure of the primary side is equal to that of the secondary side. Copyright © 2015 by JSME.

关键词： Nuclear fuels

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Organic Phototransistors: Flexible and Transparent Organic Phototransistors on Biodegradable Cellulose Nanofibrillated Fiber Substrates (Advanced Optical Materials 9/2018)

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Advanced Optical Materials 2018年第9期6卷

作者： Junsu Park Jung-Hun Seo Seung-Won Yeom Chunhua Yao Vina W. Yang Zhiyong Cai Young Min Jhon Byeong-Kwon Ju Display and Nanosystem Laboratory College of Engineering Korea University Anam-dong Seoul 02841 Republic of Korea Sensor System Research Center Korea Institute of Science and Technology Seoul 02792 Republic of Korea Department of Materials Design and Innovation University at Buffalo The State University of New York Buffalo NY 14260 USA Department of Material Sciences and Engineering University of Wisconsin–Madison Madison WI 53706 USA Forest Products Laboratory USDA Forest Service Madison WI 53726 USA

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Fire compartment partitioning approaches for fire probabilistic safety analysis of a high-temperature gas-cooled reactor 8

Fire compartment partitioning approaches for fire probabilis...

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8th International Topical Meeting on High Temperature reactor technology, HTR 2016

作者： Geng, Yuhao Zhao, Jun Tong, Jiejuan Wang, Wei Di Maio, Francesco Zio, Enrico Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety Ministry of Education Tsinghua University Beijing100084 China Energy Department Politecnico di Milano Via La Masa 34 Milano20156 Italy System Science and the Energetic Challenge Fondation EDF-Electricite de France Ecole Centrale Supelec Paris Chatenay-Malabry Cedex Paris92295 France

ISBN: (纸本)9780894487323

Fire compartment partitioning is the foundational task in Fire Probabilistic Safety Analysis (FPSA), that requires approaches able to balance analytical accuracy and computational burden. In this work, two fire compartment partitioning approaches are illustrated and applied to an electric building of a High-Temperature Gas-Cooled reactor (HTGR, e.g., HTR-PM), and the quantified risks of the compartments obtained with the two approaches are compared. The results show that risk is insensitive to the utilized fire compartment partitioning approach, making the FPSA tasks easier to be performed.

关键词： Fires

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Research on large equipment maintenance system in life cycle

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IOP Conference Series: Earth and Environmental science 2017年第1期69卷

作者： Xiaowei Xu Hongxia Wang Zhenxing Liu Nan Zhang School of Automobile and Traffic Engineering Wuhan University of Science and Technology Wuhan 430081 China Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle Xiangyang 441053 China

In order to change the current disadvantages of traditional large equipment maintenance concept, this article plans to apply the technical method of prognostics and health management to optimize equipment maintenance strategy and develop large equipment maintenance system. Combined with the maintenance procedures of various phases in life cycle, it concluded the formulation methods of maintenance program and implement plans of maintenance work. In the meantime, it takes account into the example of the dredger power system of the Waterway Bureau to establish the auxiliary platform of ship maintenance system in life cycle.

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Study On Adaptive Electromagnetic Balancing Ability Improvement By Field Balancing For Motorized Spindle

Study On Adaptive Electromagnetic Balancing Ability Improvem...

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The 29th International Congress on Condition Monitoring and Diagnostic Engineering Management

作者： HW Fan XH Zhang MQ Jing H Liu BJ Shi HW Ma QH Mao School of Mechanical Engineering Xi'an University of Science and Technology Key Laboratory of Education Ministry for Modern Design & Rotor-bearing System School of Mechanical Engineering Xi'an Jiaotong University

Motorized spindle is widely used in the high-speed machine tools,which has the greatly high machining quality and ***,the dynamic performance of high-speed motorized spindle can be reduced by rotor unbalance,because the unbalance-induced vibration is very sensitive for the rotating speed increase of machine tool *** order to correct unbalance in the rotating condition and without human interference,an electromagnetic adaptive balancing system is ***,the electromagnetic balancing device has the limited balancing ability in itself,so it is very necessary to carry out the field balancing to improve the online active balancing *** on the single-plane balancing scheme,a field balancing program was developed and the corresponding balancing test was *** results show the field balancing is effective for the improvement of electromagnetic active balancing *** research work provides a new rotor balancing strategy for the high-speed precision motorized spindle.

关键词： motorized spindle online active balancing electromagnetic balancing device adaptive balancing method balancing ability field balancing

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Filling Modules into Spaces for Rapid Prototyping of Mechanical Assembly: Algorithm

Filling Modules into Spaces for Rapid Prototyping of Mechani...

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IEEE Conference on Industrial Electronics and Applications

作者： Z. Q. Qian B. Han Y. Lin W. J. Lin W. J. Zhang Complex and Intelligent System Research Center East China University of Science and Technology Department of Mechanical and Industrial Engineering Northeastern University Advanced Engineering Design Laboratory University of Saskatchewan

ISBN: (纸本)9781467386456

This paper proposes a computational model along with an algorithm for a new problem in computer-aided design of systems. The new problem stems from a so-called rapid prototyping of system (RPS) technology the authors developed elsewhere before. The RPS has learned from traditional rapid prototyping technique which is in essence to construct a component from the material (liquid, sheet, etc.);but the RPS is to build a system from modules or components. In the RPS technology, a space is divided into several regions that represent different components. For the visualization purpose, one can imagine that different regions are painted in different colors. Further, modules have different types. The core issue with the RPS is to "fill" modules of different types to a colored space. This problem is called the RPS problem for simplicity. The proposed model is an optimization problem model and algorithm is a combination of the differential evolution and genetic algorithm. The proposed model along with the algorithm is tested and compared with other algorithms on three examples. The result of the comparisons has shown that the proposed model along with the algorithm can well solve this RPS problem.

关键词： Rapid prototyping of systems Modular module Genetic algorithm Differential evolution

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Balance Compensation Study of Electromagnetic Active Balancer for Motorized Spindle

Balance Compensation Study of Electromagnetic Active Balance...

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2016 13th International Conference on Ubiquitous Robots and Ambient Intelligence (URAI)

作者： Bijia Shi Minqing Jing Hongwei Fan Heng Liu Qian Wang Key Laboratory of Education Ministry for Modern Design & Rotor-bearing System School of Mechanical Engineering Xi'an Jiaotong University School of Mechanical Engineering Xi'an University of Science and Technology

With the increase of rotating speed, the rotor unbalance of the modern rotating machinery becomes more sensitive. The on-line active balance is an ideal balancing mode for precision machines. Electromagnetic balancer is a non-contact new-structure balancing device in the on-line balancing field, as it can reliably work in high-speed condition and keep the position balanceable after turning down. Balance ability is an important indicator evaluating the performance of a balancer. This paper studies a new electromagnetic balancer carrying permanent magnet for the motorized spindle. Because the counterweight disk is the primary moving element of the balancer, its balance compensation value and distribution are mainly discussed in this paper. Based on the existing disk structure, the balance ability of disks with different structure is researched. The two counterweight disks with the same compensation value and distribution angle, the two disks have the same compensation value and different distribution angles, the two disks have different compensation values and the same distribution angle are analysed. The calculation results demonstrate that the first scheme is proven better in the balance ability and can be easily developed.

关键词： Motorized spindle Active balancing Counterweight disk Electromagnetic balancer Balance ability

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Study on Unbalance Magnetic Pull of the Motorized Spindle under Different Rotor Eccentricities

Study on Unbalance Magnetic Pull of the Motorized Spindle un...

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2016 13th International Conference on Ubiquitous Robots and Ambient Intelligence (URAI)

作者： Jin Wang Minqing Jing Hongwei Fan Heng Liu Bijia Shi Key Laboratory of Education Ministry for Modern Design & Rotor-bearing System School of Mechanical Engineering Xi'an Jiaotong University School of Mechanical Engineering Xi'an University of Science and Technology

High-speed precision machining is one of the important development directions of modern machining technology, high-speed spindle system is widely used in high-speed machining, and motorized spindle is the main choice of the high-speed machine tool spindle. The electromagnetic force caused by rotor unbalance is one of main vibration sources of motorized spindle. Firstly, the research on the frequency spectrum characteristic of electromagnetic force under different rotor eccentricities is very necessary to suppress electromagnetic vibration. An electromagnetic finite element model was built for a motorized spindle based on Ansoft Maxwell in this paper. The electromagnetic force spectrum variation under the static and dynamic eccentricities is studied. The Unbalance Magnetic Pull(UMP) of the motorized spindle under different rotating speeds and different eccentricities are analysed. The results show that the motorized spindle with the static or dynamic eccentricity both produces new components in the electromagnetic force. Simultaneously, the eccentricity increase positively results in the increase of UMP amplitude. The UMP is constant under the rotor static eccentricity, which has a small impact on rotor vibration, while the frequency of UMP under the rotor dynamic eccentricity is the rotating frequency, which will increase the motorized spindle vibration. Finally, by the experiment the correctness of theoretical analysis and simulation are verified. This work provides a theoretical foundation for the fault diagnosis and dynamic balance of the motorized spindle.

关键词： Machine tool motorized spindle Unbalance Magnetic Pull(UMP) Rotor eccentricity Finite element analysis Frequency spectrum analysis

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How can a service-oriented router merge with a CDN?

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, Information and systems 2016年第8期136卷 1172-1179页

作者： Wijekoon, Janaka L. Harahap, Erwin Tennekoon, Rajitha Nishi, Hiroaki Hiroaki Nishi Laboratory Graduate School of Computer Science Faculty of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama223-8522 Japan Department of System Design Engineering Faculty of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama223-8522 Japan

A large fraction of the Internet traffic is organized by the Content Delivery Networks (CDNs). CDNs redirect endusers to an appropriate server using Domain Name Servers (DNSs). Meanwhile, in future networks, it is anticipated that network routers will be equipped with more processing power and storage modules for providing most effective end-user services. From this viewpoint, a Service-oriented Router (SoR) is introduced to accelerate content-based services. This paper presents a novel method, DNS and SoR Collaborative Redirection (DSCR), to accelerate the end-user redirection. DSCR uses SoRs to collect and store network and server state information by placing SoRs at edges of the ISP network. The collected information is then used by the DSCR to leverage the DNS-based end-user redirection. We present the design and a prototype implementation of DSCR and, show how both SoR and DNS jointly can take advantage of existing Internet architecture to accelerate end-user redirection. We used a detailed simulation to evaluate the proposed method using various strategies. Simulations clearly demonstrate the effectiveness of the collaborative method, which yields 5-10% reduction in end-user latency when compared with DNS-based redirection. © 2016 The Institute of Electrical Engineers of Japan.

关键词： Routers

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Research on Post Nonlinear Geometric Algorithm for BSS of Mixed Vibration Simulation Signals from the Impeller Pumps

Research on Post Nonlinear Geometric Algorithm for BSS of Mi...

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The second International Symposium on Socially and Technically Symbiotic systems (STSS2015);The 7th International Symposium on Symbiotic Nuclear Power systems (ISSNP2015)

作者： Sun Shi-yan XIA Hong CHEN Zhi-hui YANG Bo LIU Mei-ru Fundamental Science on Nuclear Safety and Simulation Technology Laboratory College of Nuclear Science and TechnologyHarbin Engineering University Science and Technology on Reactor System Design Technology Laboratory Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China

In nuclear power plants,for rotating equipment,a normal method for monitoring the modes and diagnosing its fault is monitoring and analyzing its vibration or noise ***,the detected signals are usually the non-linear mixed signals produced by multiple pieces of equipment or their different *** order to distinguish equipment's status,Blind Source Separation technique need to be applied to separate the mixed signals,then equipment's mode can be distinguished *** existing mature BSS algorithms are based on the assumption of the linear *** it to the nonlinear mixed problem directly may cause failure or result in totally wrong *** this paper,we apply geometric algorithm to separate the mixed vibration simulation *** method follows the post-nonlinear mixing model assumption,and develops its separating measure exploiting the difference between a linear mixture and a nonlinear one from their distributions in a three-dimensional *** impeller pump,which is a typical rotating machinery in nuclear power plants,is chosen as the study *** build a three-dimensional model of a kind of impeller pump,use Finite Element Analysis method to create some correlative stress and mode analysis,decorate appropriate monitoring points to get the most intense vibration simulation signal in the pump,and then construct the mixed *** using the post-nonlinear geometric algorithm,the mixed vibration simulation signals of the pump are *** with correlation coefficient,the algorithm performs *** can obtain the same vibration peak frequency from the result as that from the source signals.

关键词： Blind Source Separation post-nonlinear model geometric algorithm the impeller pump vibration simulation signal

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