基于DBNs风机故障检测方案设计

状态监测对于了解风机的健康状况,从而制定相对应的检修方案至关重要.采用dbns对风机关键部位的温度参数进行分析和特征提取,生成在正常情况的评估出力值,通过比较评估值和实际出力情况来计算风机出现潜在故障的可能性,从而为工作人员制定检修工作部署提供决策辅助.     

Assessing the role of steam power in the first industrial revolution: The early work of Nick von Tunzelmann

This article considers the historiographical and theoretical significance of Nicholas von Tunzelmann's first book, Steam Power and British Industrialization to 1860. Von Tunzelmann assessed the quantitative impact of the Watt steam engine and its pirate copies on the British economy using the social savings method pioneered by R.W. Fogel, showing that the impact was smaller and later than many historians had supposed. These results are of more than quantitative significance because they call into question a dominant line in the history of industrialization that focuses on the steam engine as a key determinant of the dynamics of industrial growth in Britain from the late eighteenth century. This article discusses the origin of this line in the work of Arnold Toynbee and outlines its long-term influence on economic history, including contemporary debates on the question of why Europe outpaced China and India from the seventeenth century. These issues are important also for innovation studies, which often describes the relation between innovation and growth in terms of such ‘critical technologies’ as steam power; these accounts are subject to the same weaknesses as technicist histories of industrialization. Von Tunzelmann's early work is therefore of continuing theoretical and empirical significance as we seek an adequate theory of the links between innovation and growth.     

On the patterns and determinants of the global diffusion of new technologies

Taking a largely empirical approach this paper addresses the global spread of new technologies by defining two diffusion margins – the extensive, referring to the spreading of first use across economies and the intensive, referring to the intensity of use within economies. Using data relating to mail services we indicate the relative importance of the intensive and extensive margins in global diffusion over time. Using data on steamships and the basic oxygen process for steelmaking we also explore whether there are international spillovers in the diffusion process. We find evidence of spillovers which appear more likely to be negative than positive.     

龙滩水轮机座环工地加工机床安装调试

龙滩水轮机座环工地加工机床是东电设备中心为龙滩电站水轮机座环工地加工开发的专用设备,按技术要求,龙滩水轮机座环在工地安装后必须对相关的安装面(4面1密封槽)进行整体加工,以消除变形和尺寸误差。本文主要介绍龙滩水轮机座环工地加工机床的设计原理、主要结构、厂内预装试加工情况、工地安装调试及加工过程。     

小微型轴流式水轮机改进设计

基于提高水能转化效率、降低水电站维护成本,改进设计了转轮标称100cm的轴流式水轮机.主要包括核心部件转轮调桨装置和导水叶传动机构的改进设计以及采用反求技术和快速成型技术取得桨叶的三维实体造型和实物模型.小微型轴流调桨式水轮机经改进已定型生产,主要用于较低水头、较大流量的农村小微型电站.     

湛江发电厂1号汽轮发电机组振动故障分析及处理

本文对湛江电厂一台300MW汽轮机,在启动、运行中振动偏大的突出问题进行了探讨,介绍了振动原因分析、诊断和处理过程。     

多泥沙河流水电站水轮机的抗磨蚀防护技术

由于水轮机磨损的预防和修复技术关系到电站的安全运行和经济效率,所以越来越多的受到了人们的重视。本文主要说明了水轮机磨蚀的机理和主要部位,总结分析我国水轮机磨蚀预防和修复存在的问题以及较为成熟的技术,详细介绍了两种效果较好的抗磨涂层的实际应用情况,并提出优化运行抗磨措施。     

风电叶片静载荷应变测试试验

对大型全尺寸风电叶片的静载荷应变测试做了相关的介绍.测试方法采用电测法,加载方式采用葫芦水平加载,分挥舞正负和摆振正负4个方向进行了静载荷应变测试,即对该叶片承受的极限载荷能力以及叶片在极端载荷下的变形情况进行了相关测试.给生产叶片厂家提供了重要的技术参数,同时对叶片生产进一步的优化工作有参考价值,有利于我国风电产业走上自主研发之路.     

Bearing Capacity and Technical Advantages of Composite Bucket Foundation of Offshore Wind Turbines

Based on mechanical characteristics such as large vertical load,large horizontal load,large bending moment and complex geological conditions,a large scale composite bucket foundation (CBF) is put forward.Both the theoretical analysis and numerical simulation are employed to study the bearing capacity of CBF and the relationship between loads and ground deformation.Furthermore,monopile,high-rise pile cap,tripod and CBF designs are compared to analyze the bearing capacity and ground deformation,with a 3-MW wind generator as an example.The results indicate that CBF can effectively bear horizontal load and large bending moment resulting from upper structures and environmental load.     

李鸿章与轮船招商局

轮船招商局是洋务派创办的第一个官督商办性质的民用企业,在其创办与运营过程中,直隶总督李鸿章不但具有积极倡导、给予资金支持、奏请经营特权、在外交方面予以保护等维持之功,而且对其经营模式影响至大。李鸿章规定该局＂所有盈亏,全归商认,与官无涉＂,基本上采取的是官方不介入,少干涉的态度。尽管1880年以后,李鸿章多次强调需加强对轮船招商局的监管与控制,清政府对该局的盘剥与压抑也是严重的,但总体说来,李鸿章在轮船招商局的创办及其经营模式的确立方面,发挥了重要的作用,功大于过。