共查询到20条相似文献,搜索用时 93 毫秒
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介绍了水轮发电机圆盘式转子支架的结构特点.阐述了圆盘式转子支架的组装和焊接工艺及控制焊接变形的工艺措施。 相似文献
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介绍带虹吸式疏水冷却段的正置立式高压加热器的结构特点和焊接,组装工艺,着重介绍了这种形式高压加热器的疏水冷却段密封结构设计及其装焊工艺和控制长薄包壳焊接变形的措施。 相似文献
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本文通过对煤化工设备中灰锁防磨衬板的堆焊,详细介绍了钴基合金焊条电弧焊耐磨堆焊的焊接工艺参数、焊接过程的控制、采取的防变形措施及热处理工艺. 相似文献
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针对原有单管式鳍片管焊接生产中出现焊接变形复杂且不易控制、操作工劳动强度大、效率低等问题,分析了鳍片管焊接变形的种类和产生原因,通过对鳍片预先开槽、水平位置两头对称焊接和四头对称焊接两种工艺方案下,鳍片管焊接变形的基本规律的掌握,研制了四头鳍片管焊接专机,通过工艺试验,有效解决了原双翼鳍片管焊接生产缺点,改进和提高了鳍片管生产质量。 相似文献
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园形汽冷分离器制作工艺时由于利用可靠的装配固定装置,合理加放焊接收缩量,采用正确的装焊程序和防变形措施,使该装置生产时比较顺利,且能满足质量要求。 相似文献
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Energy prices are often distorted by government control, which is justified on the grounds that such control will help mitigate the negative impact of price volatility from oil imports, and thus positively affect the domestic economy. In this paper, we show in a two-sector growth model, that regulatory price distortion can negatively affect the economy, and then, based on the model, we empirically estimate the impact of the price distortion on output growth in China, using monthly, time series data from 2005M1 to 2012M12. In contrast to the usual argument for regulatory control to mitigate price volatility, we find that regulatory price distortion negatively affects output growth in China during both the short and long term, because it is robust to different measures of output and price distortion. Hence, the argument that using price regulation to protect economic growth is undermined, and subsequently, this study lends its support to energy price deregulation. A market oriented energy price regime may improve the resilience of the domestic economy to global oil price shocks. 相似文献
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何培玉 《电网与水力发电进展》2008,24(6):78-80
边墙挤压混凝土断面为不对称梯形,以铰接的方式使边墙适应垫层区的变形,防止其底部因碾压不达标而形成空腔,有效控制对面板的不利影响。墙身高度为40cm,上游坡比为1:1,4,与面板坡比一致,顶部宽度为10cm,底部宽度为71cm,内侧坡比为8:1,主要结合边墙与垫层间的接缝情况,保证在碾压过后达到设计标准。 相似文献
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将活塞环设计成扭曲结构,是现代高性能发动机活塞环设计中常用的手段。而端面扭曲量的大小,对发动机性能有重要影响,是设计活塞环扭曲结构的重要依据。人们用扭转能量的方法研究得出了计算扭曲环扭曲量的传统计算公式,按此计算,活塞环的最大扭曲量应该发生在116°附近。然而对扭曲环扭曲量的实物测试结果显示,扭曲环的最大扭曲量通常都发生在开口对面,即0°附近。本文通过有限元分析的方法,模拟出活塞环被安装到缸套中的过程。计算出活塞环最大扭曲量发生就在0°附近,与实物测试结果一致。通过观察扭曲环装机使用后上下端面同环槽的接触痕迹,也验证了最大扭曲确实发生在开口对面部位。 相似文献
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Analysis of the current total harmonic distortion for different single-phase inverters for grid-connected pv-systems 总被引:1,自引:0,他引:1
A method to characterise the current total harmonic distortion for single-phase inverters is proposed. This method is based on the performance of the inverters along two different types of days: clear sky and partially cloudy sky days. An expression to estimate the average value of the current total harmonic distortion for each type of day is proposed. The values obtained from these expressions pick up the behaviour of the inverters for the two most usual climatic conditions. Moreover, the values obtained can be used to compare the electricity supply quality of different inverters. 相似文献
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一种应用于谐波检测的三相锁相环 总被引:1,自引:0,他引:1
为准确检测负载谐波电流,针对瞬时无功功率理论检测方法(iP-iQ)在电网电压不平衡、畸变等条件下谐波检测的不足,提出了一种新的基于双同步旋转坐标变换及交叉解耦的三相锁相环消除二倍频分量,实现更高的锁相精度、有效消除纹波。通过与传统锁相环(SRF-PLL)运用于(iP-iQ)法进行谐波检测的仿真对比,结果表明在电网电压不平衡和畸变条件下,新的三相锁相环(IDDSRF PLL)提取到的基波畸变率分别降低了1.18%和1.42%,从而提高了(iP-iQ)法的谐波检测性能。 相似文献
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A tandem solid-state dye-sensitized solar cell (SSDSC) without color distortion for potential photovoltaic window applications is reported. The bifacial tandem SSDSC with two spectrally complementary sensitizers using parallel-connection is realized, which leads to non-color distortion. The Commission Internationale de l'Eclairage (CIE) chromaticity diagram is applied to verify the extent of color distortion. At this circumstance, the photovoltaic performance for the tandem SSDSC with a power conversion efficiency of 3.3% was achieved under AM 1.5G, 100 mW/cm2 illumination. The overall efficiency in the tandem architecture outperformed each individual cell. Our results demonstrate the feasibility for visible light transmission, non-color distortion, power-generating windows for application in building-integrated photovoltaics (BIPV). Moreover, this tandem SSDSC architecture has potential for the integration into window curtains application due to its flexible characteristics. With further extension of the absorber spectrum into the IR region, a better solid-state tandem DSC is expected. 相似文献
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掺合料对混凝土收缩影响及收缩模型分析 总被引:2,自引:1,他引:1
针对高性能混凝土添加掺合料后早期收缩变形较普通混凝土复杂,研究了矿渣、粉煤灰、硅粉、减缩剂、减水剂对高性能混凝土收缩的影响,建立了混凝土施工期应力计算收缩模型,并与常用收缩模型进行了对比分析。结果表明,该模型更适合高性能混凝土收缩变形计算。 相似文献