大吨位预制管廊钢筋笼吊具结构设计与试验研究

为满足雄安新区大吨位整体式装配综合管廊预制过程的钢筋笼吊装施工要求,提高吊装过程的安全性和稳定性,开展了大吨位预制管廊钢筋笼吊具结构设计与试验研究.通过分析钢筋笼吊装过程中的载荷类型和特点,对无风起吊工况和无风负载工况下钢筋笼吊装过程的吊具组合载荷进行了计算.建立了钢筋笼吊具的有限元模型,进行结构应力分析,识别出吊装过...     

大型扁担型吊具设计

以江西新钢300万t薄板转炉工程连铸机大包回转台吊装专用吊具为例,对扁担型吊具的受力情况进行分析,并依据分析结果,对扁担型吊具截面尺寸的最终确定做了详细地分析与计算。经工程应用,效果良好。     

中国现代五项赛事中心体育场钢桁架吊装技术

介绍了体育场钢桁架的结构构造特点,并就其吊装工艺原则作了阐述,从吊具的优化设计、吊点的合理计算等方面,论述了吊装的技术措施,确保了结构构件和吊装的安全,保证了吊装的持续进行,有效缩短了工期。     

深圳会议展览中心钢结构工程吊装技术

介绍了展览大厅结构构造特点，并就其钢结构工程的吊装工艺原则作了阐述，从吊具的优化设计、吊点的合理计算等方面，论述了吊装的技术措施，确保了楼板结构和吊装的安全，保证了吊装的持续进行，有效缩短了工期。     

P1000蒸汽发生器开顶法吊装方式与M310堆型吊装方式的分析

针对蒸汽发生器的吊装,本文详细介绍了M310堆型吊装方式与AP1000开顶法吊装方式的工艺与专用吊具。从主设备安装的角度分析了两种吊装方式的优缺点,M310堆型吊装方式安全性高、工艺成熟,开顶法吊装方式工艺简化、工具简单。     

装配式混凝土结构停车楼吊装施工技术

装配式停车楼吊装施工是结构施工中至关重要的一环,为保证停车楼顺利有序吊装,本文结合中国第一汽车集团公司某项目装配式停车楼现场构件吊装施工,针对所选吊装方案,对不同类型构件吊具安装、构件起吊调整、构件下落、调整对位等吊装工艺进行分析,并对墙板翻转和双T板水平行进穿板进行了重点介绍,保证了预制构件吊装施工的质量和进度。     

预制板梁吊装设计与验算

文章对桥梁工程中的预制板梁吊装专项施工方案进行了分析研究,主要针对板梁的吊装设计与吊具施工验算。探讨了预制板梁在预制场脱模吊装和现场吊装时的受力问题,得出板梁在吊装过程中是安全的,且不需要再对板梁吊装时单独验算的结论;并通过对吊具的验算,确保了施工过程中板梁和吊机的安全。     

超深地下连续墙钢筋笼整体吊装

地下连续墙施工过程中,因钢筋笼尺寸比较大、钢筋笼缺乏刚度、钢筋笼过重等原因导致其安装精准度无法得到保障,为保证钢筋笼吊装作业的安全性及精准性,在实际作业过程中,施工人员应该结合施工具体情况选择合适的施工设备,对吊具的性能进行计算,编制出完善的吊装方案。结合施工管理规范及长期施工积累的经验,以塘沽站地铁工程作为研究案例,对地连墙钢筋笼吊装技术进行深入的研究分析,详细的阐述出钢筋笼吊装作业的难点及关键点。     

大节段混凝土箱梁智能化吊装施工关键技术

针对大节段混凝土箱梁传统吊装施工工效低，智能化程度低，存在高空作业安全风险等问题，开展工艺创新研究。通过合理优化设计吊杆，实现吊杆进入吊孔后自动卡紧，进而实现吊装作业高效、安全、自动化。对智能吊具的关键部件进行仿真与受力分析，结果表明智能吊具关键部件的刚度与安全系数满足要求。运用U-NET吊孔识别算法与双目识别三维定位算法实现吊孔与吊杆的智能对位。通过对比，大节段混凝土箱梁智能化吊装施工工艺提升工效72%，人工需求降低100%，实现了预制场吊装少人化，为无人化梁场奠定基础。     

核反应堆堆内构件吊具设计

核反应堆堆内构件的吊装由于环境辐照剂量大、精度要求高等原因导致工作难度较大,本文根据某型核反应堆堆内构件的结构特点设计一套专用的吊具,给出了结构简介,对其关键零件进行了强度核算,并提出了调试、安装和使用工艺等要求。     

Design and simulation of type II fuzzy logic controller for capturing maximum wind energy

The main purpose of this paper is to capture the maximum output power of the wind turbine under various environmental conditions. To achieve this goal, the wind turbine model has been studied and analysed under both low-wind and high-wind circumstances and due to the noisy behaviour of the wind, type II fuzzy logic controller is used for this purpose. Simulations with MATLAB show that type II fuzzy logic controller has better performance than type I.     

Wind field simulation and wind‐induced responses of large wind turbine tower‐blade coupled structure

Herein, by a case study on a 5‐MW wind turbine system developed by Nanjing University of Aeronautics and Astronautics, the wind field simulation and wind‐induced vibration characteristics of wind turbine tower‐blade coupled systems is analyzed. First, the blade‐nacelle‐tower‐basis integrated finite element model with centrifugal forces induced by rotational blades is established. Then, based on a harmony superposition method and the modified blade element‐momentum theory, the fluctuating wind field of tower‐blade coupled systems is simulated, which considers wind shear effect, tower shadow effect, rotational effect, blade‐tower dynamic and model interaction effects. Finally, the wind‐induced dynamic responses and wind vibration coefficients of the wind turbine tower‐blade coupled structure are discussed through the ‘consistent coupled method’ previously proposed by us. The results indicate that the wind‐induced responses of a large wind turbine tower‐blade coupled structure present complicated modal responses and multimode coupling effect. Additionally, the rotational effect would amplify aerodynamic loads on blades with high frequency, wind‐induced dynamic responses and wind vibration coefficients of wind turbine tower. The centrifugal force effect could also amplify natural vibration frequency of the tower‐blade coupled system and reduce the wind‐induced dynamic responses and wind vibration coefficients of wind turbine tower. The research could contribute to wind‐resistant design of structure for a large‐scale wind turbine tower‐blade system. Copyright © 2014 John Wiley & Sons, Ltd.     

台风风场作用下体育场罩棚风压分布风洞试验研究

通过刚性模型测压风洞试验研究了台风风场高湍流、强变异性等特征对大跨结构风压分布特性的影响。以某体育场罩棚为原型制作1∶300刚性模型,进行了常规B类风场和台风风场作用下的测压对比试验。基于试验数据,从测点风压和总体升力角度对两类风场作用下体育场罩棚结构的风压分布总体特性进行了分析,重点比较了典型测点在典型风向角下的风压分布规律及相互关系。结果表明：两类风场作用下平均风压的分布规律基本类似,但各风向角下台风风场中的屋盖总体升力比B类风场增大8%~25%;台风风场的高湍流特性导致基于极值负风压求得的各风向角下屋盖总体升力比B类风场大27%~46%,各测点的极值风压均明显高于常规B类风场作用下的对应值,比值约为1.13~1.70,因此对于台风多发地区的大型体育场屋盖设计,必须考虑台风风场高湍流所致的脉动风压增大效应。     

Dynamic overset 2D CFD numerical simulation of a small vertical axis wind turbine

ABSTRACT

The environmental friendly sources of power have been explored due to increased environment degradation. In this regard, wind energy may be a viable option. A renewed involvement in Vertical axis wind turbines (VAWT) was found. A wide variety of factors such as the cut-in, cut-out wind speed will decide the beneficence of VAWT as a function of energy production and reliability. In this research work, 2D computational fluid analysis of an aggregate small type of vertical axis wind turbine is performed using pecuniary codes of GAMBIT 2.3 and FLUENT 6.3. At starting, the simulation model and numerical method of small type of vertical axis wind turbine is presented in detail having classical NACA0018, NACA0021 and NACA0025 three-bladed rotor. The result shows that NACA0025 bladed rotor has the highest moment of 2.9195?Nm and power 43.7924?W at a tip speed ratio?=?6.     

沿海滩涂地区风机基础设计

风能作为一种清洁能源,具有显著的社会和环境效益。近年来世界风电装机容量平均以27％的速度增长,滩涂和近海的风力资源开发则更具潜力。风机基础是风机结构的关键部分,其主要计算内容包括：荷载组合值、地基承载力、稳定性、地基变形及基础受冲切、抗剪切等。当采用桩基础时,尚应复核桩身强度,桩基方案应结合承台及单桩承载力综合确定。由于风力发电机组对倾斜敏感,基础变形往往成为控制指标。在风机塔筒与基础的联接设计、地基基础长期变形发展规律、抗震抗风设计等方面还需做进一步专门研究。此文所研究的成果可供类似沿海地区风机基础设计参考。     

The methodology for aerodynamic study on a small domestic wind turbine with scoop

The aim of this study is to investigate the possibility of improving wind energy capture, under low wind speed conditions, in a built-up area, and the design of a small wind generator for domestic use in such areas. This paper reports the first part of this study: the development of the methodology using physical tests conducted in a boundary layer wind tunnel and computer modelling using commercial computational fluid dynamics (CFD) code. The activities reported in this paper are optimisation of a scoop design and validation of the CFD model. The final design of scoop boosts the airflow speed by a factor of 1.5 times equivalent to an increase in power output of 2.2 times with the same swept area. Wind tunnel tests show that the scoop increases the output power of the wind turbine. The results also indicate that, by using a scoop, energy capture can be improved at lower wind speeds. The experimentally determined power curves of the wind generator located in the scoop are in good agreement with those predicted by the CFD model. This suggests that first the developed computer model was robust and could be used later for design purposes. Second the methodology developed here could be validated in a future study for a new rotor blade system to function well within the scoop. The power generation of such a new wind turbine is expected to be increased, particularly at locations where average wind speed is lower and more turbulent. The further study will be reported elsewhere.     

风力机与地下工程用通风机匹配分析

通过对风力机和地下工程用通风机特性分析,讨论了利用风力机作为动力源驱动通风机对地下工程进行通风的匹配方法。通过实例计算对所讨论方法进行了验证,结果表明在达到两者匹配的设计风速时,可以完全满足地下工程通风要求。在风能资源丰富的地区,利用风力机部分替代电能驱动地下工程通风机,可实现地下通风的风能有效利用,促进地下工程通风的节能减排设计。     

风力发电在建筑中的应用

综述了目前国内外风力发电的现状,阐述了风力发电与现代建筑相结合的必要性。简述风力发电的原理以及当前主要的风力机类型。介绍了风力发电在现代建筑物中的两种应用形式,详细阐述了这两种发电方式的工作原理,分别介绍了这两种风电建筑一体化的发电方式的国内外实例及其节能效果。从理论和实践两方面证明了这两种发电方式的可行性。     

附着升降脚手架风振响应分析研究

以上海长峰商厦工程为背景,建立了附着升降脚手架有限元分析模型,对其进行了动力特性分析及在风荷载下的动力响应分析,得出了指导相关工程实践的结论。     

兆瓦级风力发电结构地震作用研究

近年来,国内外的风力发电发展迅速,位于地震高烈度区的风电场越来越多,风电结构的抗震设计日趋重要。然而,目前国内外还没有针对风力发电结构抗震设计的成熟标准。虽然IEC等规范给出了简略的风电结构抗震计算方法,但这些简化对于这种特殊的高耸结构是否准确合理还需要验证。为了论证IEC简化方法、底部剪力法、振型分解反应谱法等国内外的规范方法对风力发电机构地震作用评估的合理性,文中采用这些规范方法对风电结构的地震作用做了分析。选取了一组实际地震波,使它们的反应谱与规范反应谱相接近,用这一组实际地震波的反应谱对风电结构进行振型分解反应谱法计算。计算结果与规范反应谱方法很接近,说明这组地震波能够反映规范反应谱的特性。以这组地震波作为输入,用有限元方法对风电结构进行了地震作用计算。通过对规范方法和有限元方法的结果进行比较,发现规范方法在风电结构的抗震设计中是偏于保守的。