Computational fluid dynamics simulation of the wind flow over an airport terminal building

Turbulence in the wake generated by wind flow over buildings or obstacles may produce complex flow patterns in downstream areas. Examples include the recirculating flow and wind deficit areas behind an airport terminal building and their potential impacts on the aircraft landing on nearby runways. A computational fluid dynamics （CFD） simulation of the wind flow over an airport terminal building was performed in this study of the effect of the building wake on landing aircraft. Under normal meteorological conditions, the studied airport terminal building causes limited effects on landing aircraft because most of the aircraft have already landed before entering the turbulent wake region. By simulating the approach of a tropical cyclone, additional CFD sensitivity tests were performed to study the impacts of building wake under extreme meteorological conditions. It was found that, in a narrow range of prevalent wind directions with wind speeds larger than a certain threshold value, a substantial drop in wind speed （〉3.6 m/s） along the glide path of aircraft was observed in the building wake. Our CFD results also showed that under the most critical situation, a drop in wind speed as large as 6.4 m/s occurred right at the touchdown point of landing aircraft on the runway, an effect which may have a significant impact on aircraft operations. This study indicated that a comprehensive analysis of the potential impacts of building wake on aircraft operations should be carried out for airport terminals and associated buildings in airfields to ensure safe aviation operation under all meteorological conditions and to facilitate implementation of precautionary measures.     

基于TIN地形数据的地形匹配算法的研究

介绍了DTM(Digtial Terrain Models)的结构,并对TIN(Triangulation of Irregular Network)地形数据进行了分析,提出了一种新的基于TIN地形数据的地形匹配跟踪算法.     

Reliability assessment of building structures under typhoon calamity

Typhoon is one of the most destructive natural calamities. Statistical data on 1949–1990 typhoons in China were used to analyze the frequency and strength of the typhoons, the relation between them and the average global ground temperature. The probability distribution of wind speed and the load of low buildings were obtained respectively on the basis of statistical data on the No. 9015 and No. 9711 typhoon. The finite element method and experimental comparison were used to obtained the probability distribution of lateral force resistance of a three-story brick-concrete building. Finally, the reliability indexes of this kind of building under No. 9015 and No. 9711 typhoon; and some valuable suggestions are given. Project (59895410) supported by NSFC     

复杂体型钢筋混凝土高层建筑的推覆分析方法和应用

In this paper, push-over analysis for tall concrete structures was made and a corresponding computer program was given.Several kinds of elements in the program were considered to meet the demand of tall buildings with complex structural type. These elements included beam-column element for beams and columns, single slice wall element and three vertical line element for walls, and tube-wall element for tubes. Computational example for verifying the models indicates that the result obtained by this method is identical with a well-known test result and the program can be used to search for the full process of structural reaction, even the softening stage of the structure. With this push-over analysis method, an actual tall building with complex structural type was analyzed, and the result has been put into practice of the structural design of the building.     

Safety analysis of optimal outriggers location in high-rise building structures

INTRODUCTION Outriggers location has direct influence on the efficiency of the horizontal deflection control in high-rise building structures. An appropriate outrigger location will be more efficient in minimizing the horizontal deflection and reducing the restraining moments mutation. As a result, the safety of a struc-ture subjected to lateral load is guaranteed to be better. Presently, the so-called optimal location of out-riggers is derived from the principle of minimum ultimate disp…     

Numerical study on effects of door-opening on airflow patterns and dynamic cross-contamination in an ISO class 5 operating room

The contamination diffusion to the operating room when the door is open was simulated with a computational fluid dynamic (CFD) method,to give the extent of the contamination diffusion.The influence of the door-opening procedure was ignored since the door of the operating room is normally a sliding one.The flow field in the case of the 16 s course of opening the door was simulated.The simulated and the experimental results demonstrate that the extent of the contamination diffusion is around 1.5 m when there is no temperature difference between indoor and outdoor,and there is hardly any contamination diffusion when the temperature difference is 1 ℃.It can be concluded that the positive pressure difference in the operating room lost its function in preventing the contamination when the door is open.That the temperature of corridor is lower than that of operating room contributes to contamination control.Keeping 1 ℃ temperature difference between corridor and operating room and increasing positive pressure and air flow are suggested.It is more secure to set up an anteroom if persons come in or out of the operation room at the course of surgery.     

对语言实验室开放的研究

语言实验室在外语学习中发挥着重要作用。本文通过语言实验室开放的实践,分析了开放语言实验室的意义、理论基础、实施和管理,以期加强这方面的交流,更好地为学生服务。     

Optimization of time-delayed feedback control of seismically excited building structures

An optimization method for time-delayed feedback control of partially observable linear building structures subjected to seismic excitation is proposed. A time-delayed control problem of partially observable linear building structure under horizontal ground acceleration excitation is formulated and converted into that of completely observable linear structure by using separation principle. The time-delayed control forces are approximately expressed in terms of control forces without time delay. The control system is then governed by Itoe stochastic differential equations for the conditional means of system states and then transformed into those for the conditional means of modal energies by using the stochastic averaging method for quasi-Hamiltonian systems. The control law is assumed to be modal velocity feedback control with time delay and the unknown control gains are determined by the modal performance indices. A three-storey building structure is taken as example to illustrate the proposal method and the numerical results are confirmed by using Monte Carlo simulation.     

枢纽机场中转水平度量评价研究

为了全面分析我国主要机场的中转能力,准确把握我国枢纽机场建设中存在的问题,从机场航线网络的布局和航班时刻编排的角度,构建了中转水平度量模型。从模型可得到枢纽机场所能提供的中转机会和中转质量,利用模型对我国和美国的主要枢纽机场进行实证研究。结果显示,在吞吐量相当的情况下,中美两国国内枢纽机场的中转水平均高于其他类型的枢纽,美国主要枢纽机场的中转水平普遍高于我国机场。中转水平度量模型为我国枢纽机场评价指标体系的构建奠定了基础,对完善航线网络的结构和航班时刻的编排,提高中转水平等具有指导意义。     

横流冲击射流涡旋结构的实验和数值研究

The objective of this dissertationis toinvestigate thei mpingingjet under the influence of crossflow.It hasbeen known that there exist jet shear layer ,i mpinge-ment on the bottom wall ,interactions between the in-duced wall jet and the ambient crossflowin near field .There are fewintensive studies of the i mpinging jet incrossflowat home and abroad due to the complexitiesof flow, such as the formation and evolution of thevortical structures ,interactions among vortices , whileresearches on th…     

大连建设创新型城市的思考

贯彻落实党的十六届五中全会和全国科技大会精神,提高大连自主创新能力,向建设创新型城市目标迈进,需要我们立足于大连实际,适应社会主义市场经济的需求,实施自主创新发展战略,构建有利于自主创新的体制机制,培养高水平创新人才,大力发展创新文化。     

Methods for progressive collapse analysis of building structures under blast and impact loads

Progressive collapse of building structures under blast and impact loads has attracted great attention all over the world. Progressive collapse analysis is essential for an economic and safe design of building structures against progressive collapse to blast and impact loads. Because of the catastrophic nature of progressive collapse and the potentially high cost of constructing or retrofitting buildings to resist it, it is imperative that the progressive collapse analysis methods be reliable. For engineers; their methodology to carry out progressive collapse evaluation need not only be accurate and concise, but also be easily used and works fast. Thus, many researchers have been spending lots of effort in developing reliable, efficient and straightforward progressive collapse analysis methods recently. In the present paper, current progressive collapse analysis methods available in the literature are reviewed. Their suitability, applicability and reliability are discussed. Our recent proposed new method for progressive collapse analysis of reinforced concrete frames under blast loads is also introduced.     

建设生态福州的若干思考

生态城市，归根结底就是人与自然的高度和谐统一。坚持人与自然和谐的价值观导向，处理好建设、保护与发展的关系，通过发展循环经济，建设整个城市生态系统，一个生态福州是指日可望的。     

浅议创新型实验技术队伍建设

从培养创新人才出发,根据创新型实验技术队伍建设的必要性,迫切性和现行实验技术队伍存在的主要问题,提出了从根源上解决问题的具体措施。     

创建节约型高职院校后勤管理新模式

创建节约型高职院校后勤管理模式具有现实意义。高职院校后勤管理工作要坚持＂细化＂、＂务实＂、＂以人为本＂的基本原则,树立科学理财观,推进后勤管理集约化;建设节约型后勤文化,提升后勤管理者人文素养;树立＂以人为本＂理念,稳步实践节约型后勤管理,以促进节约型高职校园的建设。     

Forming shared inquiry structures to support knowledge building in a grade 5 community

This study explores the reflective processes by which a grade 5 science community co-constructed shared inquiry structures to focus and guide its inquiry about human body systems over a school year supported by a collaborative online environment. The co-constructed structures included a list of collective wondering areas as the shared focus of inquiry and models of the inquiry process in the form of “research cycle.” Qualitative analyses of field notes, classroom videos, student notebooks and interviews elaborate the evolution of the inquiry areas and the “research cycle” model as well as students’ adaptive use of the structures to guide deeper inquiry. Content analyses of students’ individual research questions and collaborative online discourse indicate that students used the structures to develop more advanced inquiry and make productive contributions. The results contribute to elaborating a reflective structuration approach to co-organizing and sustaining long-term, open-ended inquiry in knowledge building communities.     

基于培养目标的工业工程实验室建设与管理

本文简述了工业工程的定义、学科特点,并以河南科技大学工业工程专业实验室建设为例,重点阐述了基于培养目标的工业工程专业实验室规划基本思想、建设过程、建设成果和实验室管理方法,为国内其他高校工业工程专业实验室建设提供参考。     

略论全面建设小康社会的奋斗目标

当代中国已在总体上进入小康社会,现阶段,中国进入了全面建设小康社会,加快推进社会主义现代化的新的发展阶段,我们应紧紧抓住21世纪头二十年这一重要战略机遇期,全面推进小康社会建设。     

论政府在构建创业环境中的作用

文章试从市场增进论视角对政府应该在大力促进市民观念更新,为营造良好的创业环境;大力推进经济体制改革,努力营造公平竞争的社会发展环境;大力发展社会主义民主政治,建设社会主义政治文明,努力维护社会公正环境;大力推进文化创新,营造适合基本经济制度和发展需要的文化氛围环境所发挥的作用作了分析和论述,旨在为政府的“和谐创业”决策寻求理论和实践的支撑。     

基于非平整地面的轮腿复合机器人运动学研究

针对一种轮腿复合机器人进行了运动学分析,得到机器人在平整地面上的运动学模型。在此基础上将非平整地面对机器人运动的影响简化为两个力作用在机器人上,建立机器人在非平整地面上的运动学方程。利用Matlab软件仿真分析了几种典型路况下机器人的运动情况。仿真结果表明,当机器人在地面波动类似方波和三角波的地面上行走时,机器人参考点的位姿与静止目标位姿之间的偏差最大。从而为机器人的控制系统的设计提供了一个详细准确的运动学方程。