检索结果-内蒙古大学图书馆

Study on flow induced vibration characteristics of wo inline tubes and two parallel tubes

Hedongli Gongcheng/Nuclear Power Engineering 2014年第1期35卷 87-91页

作者： Feng, Zhipeng Zhang, Yixiong Zang, Fenggang Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu 610041 China

In order to investigate the fluid structure interaction problems occurring in tube bundles, a numerical model is presented. The unsteady three-dimensional Navier-Stokes equation and LES turbulence model are computed with finite volume approach on structured grids combined with the technique of dynamic mesh. The model presents a three dimensional fully coupled approach with solving the fluid flow and the structure vibration simultaneously, for the tube bundles in cross flows. The results show that, the presented model is validated with experimental data and compared with existing models in the literature. Trajectory of single tube is "8" shape at "locked in". The two parallel tubes oscillate in opposite phase and both have the same amplitude. For pitch higher than 1.5D, there is no mutual influence of the tubes and response is close to the case of single tube. The lift force and amplitude of downstream tube of two inline tubes are increasing as the pitch increases. The upstream tube is almost not influenced by the downstream one when the pitch is larger than 2D. The fluid force and response are close to the case of single tube.

关键词： Large eddy simulation

来源：评论

学校读者我要写书评

暂无评论

Corrigendum to “Modelling opportunistic spectrum renting in mobile cellular networks” [J. Netw. Comput. Appl. 52 (2015) 129–138]

引用

Journal of Network and Computer Applications 2016年 73卷 98-98页

作者： Tien Van Do Nam H. Do Ádám Horváth Jinting Wang Division of Knowledge and System Engineering for ICT (KSE-ICT) Faculty of Information Technology Ton Duc Thang University Ho Chi Minh City Viet Nam Analysis Design and Development of ICT Systems (AddICT) Laboratory Budapest University of Technology and Economics H-1117 Magyar tudósok körútja 2 Budapest Hungary Faculty of Informatics University of Debrecen Egyetem tér 1 PO Box 12 4010 Debrecen Hungary Institute of Informatics and Economics University of West Hungary Bajcsy-Zsilinszky u. 9. Sopron Hungary Department of Mathematics School of Science Beijing Jiaotong University Beijing 100044 China

来源：评论

学校读者我要写书评

暂无评论

Per Hop Data Encryption Protocol for Transmission of Motion Control Data Over Public Networks

Per Hop Data Encryption Protocol for Transmission of Motion ...

引用

International Workshop on Advanced Motion Control

作者： Rajitha Tennekoon Janaka Wijekoon Erwin Harahap Hiroaki Nishi Eiichi Saito Seiichiro Katsura Nishi Laboratory Graduate School of Science and Technology Keio University Japan Katsura Laboratory Graduate School of System Design Keio University Japan

ISBN: (纸本)9781479957637

Bilateral controllers are widely used vital technology to perform remote operations and telesurgeries. The nature of the bilateral controller enables control objects, which are geographically far from the operation location. Therefore, the control data has to travel through public networks. As a result, to maintain the effectiveness and the consistency of applications such as teleoperations and telesurgeries, faster data delivery and data integrity are essential. The Service-oriented Router (SoR) was introduced to maintain the rich information on the Internet and to achieve maximum benefit from networks. In particular, the security, privacy and integrity of bilateral communication are not discoursed in spite of its significance brought by its underlying skill information or personal vital information. An SoR can analyze all packet or network stream transactions on its interfaces and store them in high throughput databases. In this paper, we introduce a hop-by-hop routing protocol which provides hop-by-hop data encryption using functions of the SoR. This infrastructure can provide security, privacy and integrity by using these functions. Furthermore, we present the implementations of proposed system in the ns-3 simulator and the test result shows that in a given scenario, the protocol only takes a processing delay of 46.32 ps for the encryption and decryption processes per a packet.

关键词： Service-oriented Router Bilateral Controllers hop-by-hop routing motion control over networks ns-3

来源：评论

学校读者我要写书评

暂无评论

Development of axial semi-active dynamic vibration absorbers based on magneto-rheological elastomers 21

Development of axial semi-active dynamic vibration absorbers...

引用

21st International Congress on Sound and Vibration 2014, ICSV 2014

作者： Yang, Zhirong Li, Qingyun Rao, Zhushi Qin, Chunyun Gong, Xinglong Institute of Vibration Shock and Noise State Key Laboratory of Mechanical System and Vibration Shanghai Jiaotong University Shanghai200240 China Marine Engineering Institute Jimei University Xiamen361021 China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Mechanics and Mechanical Engineering University of Science and Technology of China Hefei230027 China

ISBN: (纸本)9781634392389

Magneto-rheological elastomers (MREs) are a new kind of Magneto-rheological materials mainly composed of polymer rubber and micro-sized magnetizable iron particles. In this technical note, a shear-mode semi-active dynamic vibration absorber (SDVA) based on MREs is proposed and the dynamic design principle of an axial SDVA attached to ship shafting is studied. The material preparation of MREs and their properties under different magnetic fields are introduced. The structure of a single SDVA is designed. Furthermore, the natural frequencies of the single SDVA under different magnetic fields and temperatures are experimentally evaluated. It is found that the natural frequency of SDVA has a decreasing trend with the temperature increasing. However, it has an increasing trend with the excitation current increasing in the same temperature situation. The effect of temperature is more obvious than the excitation current.

关键词： Intelligent materials

来源：评论

学校读者我要写书评

暂无评论

The freeform collimating lens designed for light transmission

The freeform collimating lens designed for light transmissio...

引用

International Conference on Advanced Robotics and Intelligent systems (ARIS)

作者： A. J. W. Whang K. C. Jhan C. C. Su J. W. Chen Photonics System Simulation and Design Laboratory National Taiwan University of Science and Technology Taipei Taiwan Department of Electro-Optical Engineering National Taiwan University of Science and Technology Taipei Taiwan Department of Electronic Engineering National Taiwan University of Science and Technology Taipei Taiwan

This paper explores the design of a collimating lens based on freeform method. With this freeform structure, the light can be propagated as nearly parallel light which allow the light be transmitted to a large distanc... 详细信息

关键词： Lenses Lighting Vectors Educational institutions Laboratories Renewable energy sources Optical fibers

来源：评论

学校读者我要写书评

暂无评论

Theoretical framework for innovation design with optimised customization

Theoretical framework for innovation design with optimised c...

引用

4th International Conference on Frontiers of Manufacturing science and Measuring technology, ICFMM 2014

作者： Wang, Huan Huan Yang, Qing Ping College of Mechanical Engineering Tianjin University of Science and Technology Tianjin 300222 China Micro Optics Electronic Machine System Education Ministry Key Laboratory Tianjin University Tianjin 300072 China School of Engineering and Design Brunel University Uxbridge Middlesex UB8 3PH United Kingdom

ISBN: (纸本)9783038351924

design is the core of innovation activity, and it aims to establish better and comprehensive qualities of products. It is also a process to explore and enhance the human experience. During decades of exploration and practice, designers have developed many effective design methods and methodologies. However, users always have more needs and higher expectations. How will the human needs develop in the future? What will the future design is? This paper discusses the relationship between the development of human needs and the process of product evolution, explores the future design trends and presents a theoretical framework for innovation design with optimised customization. © (2014) Trans Tech Publications, Switzerland.

关键词： Product design

来源：评论

学校读者我要写书评

暂无评论

Kinematics and Dynamics Analysis of a Quadruped Walking Robot with Parallel Leg Mechanism

引用

Chinese Journal of Mechanical Engineering 2013年第5期26卷 881-891页

作者： WANG Hongbo SANG Lingfeng HU Xing ZHANG Dianfan YU Hongnian Parallel Robot and Mechatronic System Laboratory of Hebei Province Yanshan University Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education Yanshan University Xi’an University of Architecture and Technology Science and Technology Research Institute Yanshan University School of Design Engineering and ComputingBournemouth University

It is desired to require a walking robot for the elderly and the disabled to have large capacity,high stiffness,stability,***,the existing walking robots cannot achieve these requirements because of the weight-payload ratio and simple ***,Improvement of enhancing capacity and functions of the walking robot is an important research *** to walking requirements and combining modularization and reconfigurable ideas,a quadruped/biped reconfigurable walking robot with parallel leg mechanism is *** proposed robot can be used for both a biped and a quadruped walking *** kinematics and performance analysis of a 3-UPU parallel mechanism which is the basic leg mechanism of a quadruped walking robot are conducted and the structural parameters are *** results show that performance of the walking robot is optimal when the circumradius R,r of the upper and lower platform of leg mechanism are 161.7 mm,57.7 mm,*** on the optimal results,the kinematics and dynamics of the quadruped walking robot in the static walking mode are derived with the application of parallel mechanism and influence coefficient theory,and the optimal coordination distribution of the dynamic load for the quadruped walking robot with over-determinate inputs is analyzed,which solves dynamic load coupling caused by the branches’ constraint of the robot in the walk *** laying a theoretical foundation for development of the prototype,the kinematics and dynamics studies on the quadruped walking robot also boost the theoretical research of the quadruped walking and the practical applications of parallel mechanism.

关键词： walking robot parallel leg mechanism kinematics dynamics over-determinate inputs

来源：评论

学校读者我要写书评

暂无评论

Research on trans critical characteristic on sliding pressure booting process of SCWR

Research on trans critical characteristic on sliding pressur...

引用

2013 21st International Conference on Nuclear Engineering, ICONE 2013

作者： Liu, Liang Zhou, Tao Song, Mingqiang Chen, Juan Luo, Feng Xia, Bangyang North China Electric Power University Beijing China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

ISBN: (纸本)9780791855836

The homogeneous flow model of trans critical transient calculation is achieved by the trans critical program of SCWR which is made by FORTRAN. The SCWR sliding pressure starting scheme is simulated by this program. So that the pressure raising stage characteristic of its booting process is analyzed. The calculation result shows that, in the pressure raising stage of booting process, the maximum cladding temperature gradually increases. Coolant temperature increases gradually along with the flow direction. The dry degree also increases along with the flow direction. The highest temperature of cladding does not exceed 650 °C limits. There is no major adverse effect on heat transfer of fuel rod in the dramatic changes in the physical properties of water. Copyright © 2013 by ASME.

关键词： Heat transfer

来源：评论

学校读者我要写书评

暂无评论

Centrifugal model test of failure mode and addition stress distribution of a soft foundation with an upper crust

引用

Electronic Journal of Geotechnical Engineering 2014年第Z期19卷 9309-9322页

作者： Zhang, Junhui Yao, Yongsheng Zheng, Jianlong Zhou, Chiqing National engineering laboratory of highway maintenance technology Changsha University of Science and Technology Hunan China Texas Transportation Institute Texas Aand M University System College StationTX United States Xiamen Municipal Engineering Design Institute Co. LTD Xiamen China

In order to investigate the effects of a hard crust on the underlying soft soil, a centrifugal model test of a soft foundation with an upper crust was carried out. The failure mode of the soft foundation and the additional stresses distribution inside of the soft layer were analyzed. It is found that punching shear failure mode occurs in the hard clay crust and the soft soil layer is squeezed under the loading like a kind of squeezing effect of a closed liquid. Due to the closure of the hard crust, the horizontal additional stresses inside of the soft layer decrease with the increase of distance to the embankment centerline. However, it is much larger and can be spread more widely than that inside of a homogeneous foundation. Meanwhile, the vertical additional stresses on the interface of the crust and underlying soft layer are smaller than that inside of a homogeneous foundation and the vertical stresses diffusion coefficient is 0.73 in this study. © 2014 ejge.

关键词： Foundations

来源：评论

学校读者我要写书评

暂无评论

Centrifuge model test and numerical analysis of properties of a soft foundation with an upper crust

引用

Electronic Journal of Geotechnical Engineering 2014年第Z5期19卷 17195-17208页

作者： Zhang, Junhui Cen, Guangming Zhou, Chiqing Ouyang, Yunqing National engineering laboratory of highway maintenance technology Changsha University of Science and Technology Hunan China Texas Transportation Institute Texas A and M University System College StationTX United States Xiamen Municipal Engineering Design Institute Co. LTD Xiamen China Hunan China

The soft clay is widely distributed in Chinese coastal areas and inland lakes, where there is usually a natural hard crust to a few meters above it. The additional stress distribution inside of the soft layer with an upper crust is different from that in a homogeneous soft foundation due to the closure effect of the hard crust, which will affect the settlement after construction of the highway and the behavior of the piled bridge abutment. The centrifuge model test and Particle Flow Code in two dimensions (PFC2D) were conducted to investigate the failure mode of the soft foundation with an upper crust and to study the horizontal additional stress distribution inside of the soft layer under an embankment load. It was found that a punching shear failure mode occurred in the hard clay shell and the soft soil layer was squeezed like a kind of squeezing effect of a closed liquid. It caused a wide influencing zone of the horizontal additional stress inside of the soft soil layer, which decreased with the increase of the distance to the embankment centerline and was much larger than the Boussinesq's solution at the same position. If the unusual additional stress is neglected in bridges and/or culverts structure designing, it will lead to an abutment collapse, culvert deflection and breaking. © 2014 ejge.

关键词： Failure modes

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：