PWT-CWS.02NRT打底与RMS填盖焊接技术(一)

介绍了PWT外焊自动根焊和RWS自动焊填盖技术，重点讲述了自动焊技术中焊接材料的选用、焊接工艺参数的计算和焊接质量的控制。     

Flame-Sprayed Glaze Coatings: Effects of Operating Parameters and Feedstock Characteristics Onto Coating Structures

Many substrates do not sustain the conventional glazing process (i.e., vitreous glazing) due to the relatively high temperature required by this treatment (i.e., up to 1400 °C in some cases) to fuse glazes after their application on the surface to be covered. Flame spraying could appear as a solution to circumvent this limitation and to avoid thermal decomposition of substrates. This contribution describes some structural attributes of glaze coatings manufactured by flame spraying. It also discusses the influence of the feedstock powder morphology and some of its physical properties on coating characteristics. This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain Montavon, Ed., ASM International, Materials Park, OH, 2007.     

基于动态参数的按需可扩展地址分配算法

提出了一种基于动态参数的按需可扩展地址分配算法,根据分布式地址分配机制(DAAM)对16 bit地址空间进行分块,根据网络状况来动态调整参数以及进行地址一次或者多次扩展;同时改进路由算法,使其与Cluster-Tree协议兼容。仿真表明改进算法在地址分配成功率、平均分配耗时等方面优于DAAM以及它的改进方案EDAA-BA和RBAC。     

基于混沌时间序列理论的发动机状态参数降噪研究

针对因缺乏未染噪数据而难以考查航空发动机状态参数降噪效果的问题,提出了基于混沌时间序列理论来考查其降噪效果的办法,并结合实例考查了小波、奇异谱分析和局部投影3种降噪方法对航空发动机状态参数的降噪效果.仿真结果表明,局部投影法更多地保留了发动机状态参数的混沌特性,适用于航空发动机状态参数的降噪处理.     

基于兼容性网格分割的骨骼参数计算

为了解决骨骼参数难以测量的问题,提出一种利用网格分割结果计算参数的方法.首先对骨骼网格模型在提取少量特征点的基础上进行语义分割;然后将分割得到的模板借助基于Laplacian变形的非刚性配准,指导同类骨骼模型实现快速兼容性分割;最后结合网格分割结果及特征点计算出骨骼的主要形态参数.实验结果表明,该方法仅需少量的用户交互就能获得较好的测量效果,结合模板的策略也支持大批量骨骼模型的参数测定.     

Gain‐scheduled filtering for linear parameter‐varying systems using inexact scheduling parameters with bounded variation rates

This paper is concerned with the problem of full‐order H₂ linear parameter‐varying filter design for continuous‐time systems with bounded rate of variations under the condition that the scheduling parameters do not exactly fit the real ones. The scheduling parameters and their derivatives are supposed to belong to polytopes with known vertices. The synthesis conditions are formulated in terms of parameter‐dependent bilinear matrix inequalities by means of parameter‐dependent Lyapunov function and introducing some extra variables for the filter design. An iterative procedure is presented to cast the bilinear matrix inequalities problem into a linear matrix inequality optimization problem. The design of robust filters for both time‐varying and time‐invariant systems can be viewed as particular cases of the proposed method. The merit of the method presented in this paper lies in two fields. The first pertains to dealing with the measurement uncertainty in a less conservative manner than available approaches in the gain‐scheduled filtering problem. The second is to provide more efficient methods than the existing ones in the literature for the robust filter design. Copyright © 2015 John Wiley & Sons, Ltd.     

再生混凝土材料声学特性参数分析

为在混凝土无损检测中采集到高信噪比的声发射信号,对再生混凝土材料的声学特性参数进行了试验研究。通过模拟加载确定了声发射检测环境的门槛值,采用断芯试验测试了再生混凝土材料的检测时间参数,包括峰值鉴别时间(PDT)、撞击鉴别时间(HDT)和撞击闭锁时间(HLT);同时确定了信号在再生混凝土材料中的传播波速,为再生混凝土材料声发射检测参数的设置提供了一定的试验依据。该声发射检测参数设置具有操作简单易行、实时动态、对原有建筑物损伤小等特点,在混凝土结构声发射检测中具有较好的适用性。     

三峡水电站发电机断路器设计及运用研究

三峡右岸电站是世界上首个在700 MW级水轮发电机主回路配套使用发电机断路器(简称GCB)的水电工程,其额定电流26 kA、短路开断电流160 kA。为了确保大型GCB在三峡工程中得到成功运用,进行了大量的工程设计和研究工作,解决了GCB特征参数确定、设备布置、厂内运输安装等一系列工程实际问题。对GCB在三峡水电站工程实际运用中遇到的一些问题及其有针对性地开展的分析研究工作、所采取的一些应对措施等情况作了介绍。对问题的论述及结论可为同类电站的设计提供参考。     

基于分布参数的煤矿井下直流杂散电流研究

直流杂散电流是引起井下瓦斯爆炸的重要原因之一,对煤矿安全生产具有很大威胁。针对这一问题,从杂散电流的产生机理着手,建立了井下直流杂散电流的分布参数模型;在该模型的基础上,仿真分析了各个参数对杂散电流的影响,得出了如下结论:随着机车电流的增加、供电区间的延长及轨道电阻的增大,杂散电流也会线性增加,可通过减小机车电流、缩短供电区间长度及减小轨道电阻来减小杂散电流;轨道与大地间过渡电阻低于安全值时会造成杂散电流急剧增大,保证轨道与地之间的绝缘是限制杂散电流的一种有效措施。     

水轮发电机转子系统磁悬浮装置 结构优化设计

针对水轮发电机混合磁悬浮承重系统中电磁悬浮装置局部磁饱和问题,进行了结构优化设计,提出了适当增加推力盘及电磁铁顶部厚度的方法,有效地减轻了电磁悬浮装置局部磁饱和现象,同时也使总的磁浮力有所增加。从承载力与漏磁角度考虑,得出了推力盘及电磁铁顶部厚度的最佳设计值。