检索结果-南通市图书馆

A nonlinear wake model of a wind turbine considering the yaw wake steering

Journal of oceanology and Limnology 2024年第3期42卷 715-727页

作者： Yunzhou LI Zhiteng GAO Shoutu LI Suiping QI Xiaoyu TANG College of Meteorology and oceanography National University of Defense TechnologyChangsha 410073China Multi-function Towing Tank School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Energy and Power engineering Lanzhou University of TechnologyLanzhou 730050China Institute of oceanographic Instrumentation Qilu University of Technology(Shandong Academy of Sciences)Qingdao 266061China State Key Laboratory of Industrial Control Technology College of Control Science and EngineeringZhejiang UniversityHangzhou 310027China Laoshan Laboratory Qingdao 266237China

Duo to fluctuations in atmospheric turbulence and yaw control strategies,wind turbines are often in a yaw *** predict the far wake velocity field of wind turbines quickly and accurately,a wake velocity model was derived based on the method of momentum conservation considering the wake steering of the wind turbine under yaw *** consider the shear effect of the vertical incoming wind direction,a two-dimensional Gaussian distribution function was introduced to model the velocity loss at different axial positions in the far wake region based on the assumption of nonlinear wake *** work also developed a“prediction-correction”method to solve the wake velocity field,and the accuracy of the model results was verified in wake experiments on the Garrad Hassan wind ***,a 33-kW two-blade horizontal axis wind turbine was simulated using this method,and the results were compared with the classical wake model under the same parameters and the computational fluid dynamics(CFD)simulation *** results show that the nonlinear wake model well reflected the influence of incoming flow shear and yaw wake steering in the wake velocity ***,computation of the wake flow for the Horns Rev offshore wind farm with 80 wind turbines showed an error within 8%compared to the experimental *** established wake model is less computationally intensive than other methods,has a faster calculation speed,and can be used for engineering calculations of the wake velocity in the far wakefield of wind turbines.

关键词： far wake wake model wake steering wind shear wind farm

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Response of underground pipeline through fault fracture zone to random ground motion

引用

Earthquake Science 2011年第4期24卷 351-363页

作者： Dai Wang Zhuobin Wei Jianwen Liang postdoctoral station of naval architecture and ocean engineering Naval University of Engineeringi Wuhan 30033 China Department of Logistics Command and engineering Naval University of Engineering Tianjin 300450 China Department of Civil engineering Tianjin University Tianjin 300072 China

It is assumed that a pipeline is laid through a vertical fault fracture zone, and is excited by seismic ground motion modelled as stationary stochastic process. For horizontal incidence of waves, the cross-PSD （Power Spectral Density） function is developed using wave propagation theory, while for vertical incidence of waves the cross-PSD function is composed by auto-PSD model, coherence model and site response model. As the seismic input, the eross-PSD function is used to calculate the the axial and lateral seismic responses of underground pipeline through the fracture zone. The results show that the incident directions of seismic waves, width and soil property of the fracture zone have great influence on underground pipeline. It is suggested that the flexible joints with appropriate stiffness should be added into the pipeline near the interfaces between the fracture zone and the surrounded media.

关键词： fault fracture zone flexible joint underground pipeline seismic excitation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Parametric Dimensional Analysis on the Structural Response of An Innovative Subsurface Tension Leg Platform in Ultra-Deep Water

引用

China ocean engineering 2018年第4期32卷 482-489页

作者： ZHEN Xing-wei WU Jia-hao HUANG Yi HAN Yue YAO Jin-jiang School of naval architecture and ocean engineering Faculty of Vehicle Engineering and Mechanics Dalian University of Technology

The innovative Subsurface Tension Leg Platform(STLP), which is designed to be located below Mean Water Level(M.W.L) to minimize direct wave loading and mitigate the effect of strong surface currents, is considered as a competitive alternative system to support shallow-water rated well completion equipment and rigid risers for large ultra-deep water oil field development. A detailed description of the design philosophy of STLP has been published in the series of papers and patents. Nonetheless, design uncertainties arise as limited understanding of various parameters effects on the structural response of STLP, pertaining to the environmental loading, structural properties and hydrodynamic characteristics. This paper focuses on providing quantitative methodology on how each parameter affects the structural response of STLP, which will facilitate establishing the unique design criteria as regards to STLP. Firstly, the entire list of dimensionless groups of input and output parameters is proposed based on VaschyBuckingham theory. Then, numerical models are built and a series of numerical tests are carried out for validating the obtained dimensionless groups. On this basis, the calculation results of a great quantity of parametric studies on the structural response of STLP are presented and discussed in detail. Further, empirical formulae for predicting STLP response are derived through nonlinear regression analysis. Finally, conclusions and discussions are made. It has been demonstrated that the study provides a methodology for better control of key parameters and lays the foundation for optimal design of STLP. The obtained conclusions also have wide ranging applicability in reference to the engineering design and design analysis aspects of deepwater buoy supporting installations, such as Grouped SLOR or TLR system.

关键词： subsurface tension leg platform structural response dimensional analysis ultra-deep water

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Analysis of periodic pulsating nanofluid flow and heat transfer through a parallel-plate channel in the presence of magnetic field

引用

Applied Mathematics and Mechanics(English Edition) 2023年第11期44卷 1957-1972页

作者： Qingkai ZHAO Longbin TAO Hang XU School of naval architecture and ocean engineering Jiangsu University of Science and TechnologyZhenjiang 212100Jiangsu ProvinceChina Department of naval architecture Ocean and Marine EngineeringUniversity of StrathclydeGlasgow G4 OLZU.K. State Key Lab of ocean engineering School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

In this paper,we focus on the two-dimensional pulsating nanofluid flow through a parallel-plate channel in the presence of a magnetic *** pulsating flow is produced by an applied pressure gradient that fluctuates with a small amplitude.A kind of proper transformation is used so that the governing equations describing the momentum and thermal energy are reduced to a set of non-dimensional *** analytical expressions of the pulsating velocity,temperature,and Nusselt number of nanofluids are obtained by the perturbation *** the present study,the effects of the Cu-H2O and Al_(2)O_(3)-H2O nanofluids on the flow and heat transfer in pulsating flow are compared and *** results show that the convective heat transfer effect of Cu-H2O nanofluids is better than that of Al_(2)O_(3)-H2O ***,the effects of the Hartmann number and pulsation amplitude on the velocity,temperature,and Nusselt number are examined and discussed in *** present work indicates that increasing the Hartmann number and pulsation amplitude can enhance the heat transfer of the pulsating *** addition,selecting an optimal pulsation frequency can maximize the convective heat transfer of the pulsating ***,improved understanding of these fundamental mechanisms is conducive to the optimal design of thermal systems.

关键词： nanofluid pulsating flow heat transfer applied magnetic field

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Deployment dynamics for flexible deployable primary mirror of space telescope with paraboloidal and laminated structure by using absolute node coordinate method

引用

Chinese Journal of Aeronautics 2021年第4期34卷 306-319页

作者： Bindi YOU Dong LIANG Xiangjie YU Xiaolei WEN School of naval architecture and ocean engineering Harbin Institute of TechnologyWeihai 264209China

A nonlinear dynamic modeling method for primary mirror of Flower-like Deployable Space Telescope(F-DST)undergoing large deployment motion is proposed in this *** ensure pointing accuracy and attitude stability of the paraboloidal primary mirror,the mirror is discretized into equal thickness shell elements by considering shell *** the material nonlinear constitutive relation of flexible mirror is acquired using Absolute Nodal Coordinate Formulation(ANCF).Furthermore,the primary mirror of F-DST can be regarded as a clustered multi-body system,and its dynamic equations of elastic deformation and deployment motion are established by virtual work ***,the deployment motion of primary mirror by different driving conditions are simulated,the results show that the vibrations of mirrors that driven by elastic hinge device are more than that driven by servo *** addition,single sub-mirror deployment process will perturb the pointing accuracy of primary mirror,and the multiple sub-mirrors simultaneously deploying will seriously affect all the sub-mirrors surface accuracy because of the coupling ***,there are theoretical value and practical significance for the controlling surface accuracy and attitude accuracy of space telescope.

关键词： Deployable space telescope Deployment dynamics Flexible deformation Laminated mirror Paraboloidal structure

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of Pretreatment Conditions on Redox Property over Au/Co_3O_4/CeO_2 Material

引用

Defence Technology（防务技术） 2009年第3期5卷 203-208页

作者：邵建军马晓蕾朱锡 postdoctoral Scientific Research station in 92493 Unit 91439 Unit Department of naval architecture and ocean engineering Naval University of Engineering

Au/Co3O4/CeO2 materials are prepared using conventional deposition-precipitation method. The effects of calcination temperatures and pretreatment conditions on the catalytic performance of Au/Co3O4/CeO2 for CO low-temperature oxidation in humid circumstance are investigated. The sample calcines at 443 K in flowing air exhibited good activity and stability for CO oxidation. 80% CO conversion rate can be achieved after 3 000 min with a feed gas contained 3.1%(φw) of water vapor. The physical and chemical properties of the Au/Co3O4/CeO2 samples are characterized by X-ray diffraction (XRD),temperature-programmed reduction (H2-TPR),and transmission electron microscopy (TEM) techniques. The characterized results show that the prepared material calcined at 443 K has a weak diffraction peak of gold species observed by XRD,the grain diameter of 3 nm by TEM and best redox property and the highest activity for CO oxidation by H2-TPR at prope calcined temperature.

关键词：预处理条件氧化还原性能材料程序升温还原透射电子显微镜 X射线衍射氧化还原性质焙烧温度

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Influence of Cavity Leakage flow on Corner Separation in a Shrouded Stator Cascade

引用

Journal of Thermal Science 2023年第1期32卷 351-365页

作者： KONG Xiaozhi HUANG Tianshuo LIU Yuxin LU Huawei WANG Long naval architecture and ocean engineering College Dalian Maritime UniversityDalian 116026China Marine engineering College Dalian Maritime UniversityDalian 116026China

The impacts of the cavity leakage flow on the shrouded stator aerodynamic performance were investigated by modelling the annular cascade mainstream with the seal cavity flow path based on the validated numerical ***,the interactions between the cavity leakage and the mainstream were also determined in the current *** development of hub corner separation under the action of leakage was discussed and the total pressure loss coefficient as well as the entropy-based loss coefficient was employed to evaluate the performance changes at different seal clearances and cavity rotational *** results show that the cavity leakage flow induces a new vortex near the blade leading edge and plays an important role in the development of passage vortex and the size of concentrated shedding *** increasing the seal clearance with more cavity leakage flow rate,an increase in the pitchwise extent of the separation region under 15%span is significant and the total pressure loss in the separation core *** addition,with the increase of cavity rotating speed,the starting point of corner separation moves backward,reducing the size and depth of the hub corner *** mainstream loss reduction in combination with the entropy increase in the seal cavity causes the entropy-based loss coefficient to perform a trend of decreasing first and then increasing with the cavity speed.

关键词： shrouded stator cavity leakage flow corner separation loss coefficient

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Modified stochastic user-equilibrium assignment algorithm for urban rail transit under network operation

引用

Journal of Central South University 2013年第10期20卷 2897-2904页

作者：朱炜胡昊徐瑞华洪玲 Center of Transportation Research School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong University School of Transportation engineering Tongji University

Based on the framework of method of successive averages(MSA), a modified stochastic user-equilibrium assignment algorithm was proposed, which can be used to calculate the passenger flow distribution of urban rail transit(URT) under network operation. In order to describe the congestion's impact to passengers' route choices, a generalized cost function with in-vehicle congestion was set up. Building on the k-th shortest path algorithm, a method for generating choice set with time constraint was embedded, considering the characteristics of network operation. A simple but efficient route choice model, which was derived from travel surveys for URT passengers in China, was introduced to perform the stochastic network loading at each iteration in the algorithm. Initial tests on the URT network in Shanghai City show that the methodology, with rational calculation time, promises to compute more precisely the passenger flow distribution of URT under network operation, compared with those practical algorithms used in today's China.

关键词： urban rail transit stochastic user equilibrium assignment algorithm method of successive averages network operation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparison Between Different Finite Element Analyses of Unbonded Flexible Pipe via Different Modeling Patterns

引用

Journal of Shanghai Jiaotong university(Science) 2019年第3期24卷 357-363页

作者： PANG Guoliang CHEN Chaohe SHEN Yijun LIU Fuyong naval architecture and ocean engineering R&D Center of Guangdong Province South China University of Technology

Three kinds of models based on the same flexible pipe with 8 layers have been separately created to investigate the effects of different modeling approaches on numerical simulation results of finite element(FE)models for unbonded flexible *** the mechanical property of the unbonded flexible pipe under tension,torsion and bending load has been analyzed and compared via ABAQUS software on the basis of three created *** research shows that different modeling methods of flexible pipes make a great difference in the ***,modeling simplifications of the carcass and pressure armor have a great impact on the accuracy of the *** 3,in which the carcass is simulated by spiral isot ropic shell and other layers are Simula ted by solid element,possesses good adaptability,which has been proved by comparing the experiment data and other *** paper can offer a reference for the FE modeling methods,selection and mechanical property analysis of unbonded flexible pipe.

关键词： unbonded flexible pipe numerical simulation methods finite element(FE) analysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A review of friction stir joining of SiCp/Al composites

引用

Chinese Journal of Aeronautics 2020年第3期33卷 792-804页

作者： Lisheng ZUO Xianrui ZHAO Zeyang LI Dunwen ZUO Hongfeng WANG College Mechanical and Electrical engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of naval architecture&ocean engineering Jiangsu Maritime InstituteNanjing 211170China

SiCp/Al composites have excellent comprehensive properties and have been widely used in aerospace,automotive industry and other *** to the huge difference in performance between SiC particles and matrix alloys,traditional fusion welding methods are difficult to meet the join requirements of SiCp/Al *** stir joining(friction stir welding),as a solid phase joining process,has been proved to be a new technology with fine prospect in joining SiCp/Al composites compared with fusion welding *** some progress has been made in recent years,there are still full of *** this paper,the research status of friction stir joining of SiCp/Al composites in recent years is expatiated,including the weldability of SiCp/Al composites,the macrostructure and the microstructure of joints,mechanical properties of joints,and tool wear and ***,the existing challenges of friction stir joining of SiCp/Al composites are summarized and the future development directions are prospected.

关键词： Friction stir joining Mechanical properties Microstructure SiCp/Al composites Tool wear

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：