分段估计法作为一种重要的非线性振型结构高频天平(high-frequency force balance,HFFB)试验模态力计算方法,可以对结构脉动风荷载的空间分布进行估计。该文章抛弃了分段估计法中无量纲风荷载谱沿高度不变的假定,提出了一种可以考虑荷...分段估计法作为一种重要的非线性振型结构高频天平(high-frequency force balance,HFFB)试验模态力计算方法,可以对结构脉动风荷载的空间分布进行估计。该文章抛弃了分段估计法中无量纲风荷载谱沿高度不变的假定,提出了一种可以考虑荷载谱沿高度变化的方法。以Kaimal脉动风谱为例提出并推导了无量纲风荷载谱沿高度变化的修正系数,并以某真型输电塔架为算例,结合HFFB试验,分析了修正系数对结构响应计算的影响。研究结果表明,修正前后位移响应的背景分量计算值差异很小,但共振分量差别明显,偏差幅度达25%。对柔度较大的高耸结构,其共振分量在总响应中占比较高,需考虑荷载谱沿高度的变化;对于沿高度减小或增大的风速谱而言,现有荷载谱沿高度不变的分段估计法将高估或低估结构的位移响应。本文方法具有更高精度和更广的适用性。展开更多
The effects of operating parameters on desulfurization efficiency of a dual-alkali FGD process in a rotating-stream-tray(RST)scrubber are investigated.A dimensionless factor,ε,is proposed in this study to predict des...The effects of operating parameters on desulfurization efficiency of a dual-alkali FGD process in a rotating-stream-tray(RST)scrubber are investigated.A dimensionless factor,ε,is proposed in this study to predict desulfurization efficiency of this dual-alkali FGD system.ε represents the desulfurization ability of a dual alkali FGD system,determined by five main operating parameters such as sodium ion concentration,ratio of absorbent flow rate to flue gas flow rate,pH value of absorbent solution,ratio of sulfate ion to total sulfur ion in absorbent solution,and sulfur dioxide concentration of inlet flue gas.The empirical expression for predicting desulfurization efficiency at different temperatures is obtained through the experimental study and theoretical calculation.It provides useful guide for engineering design.展开更多
文摘分段估计法作为一种重要的非线性振型结构高频天平(high-frequency force balance,HFFB)试验模态力计算方法,可以对结构脉动风荷载的空间分布进行估计。该文章抛弃了分段估计法中无量纲风荷载谱沿高度不变的假定,提出了一种可以考虑荷载谱沿高度变化的方法。以Kaimal脉动风谱为例提出并推导了无量纲风荷载谱沿高度变化的修正系数,并以某真型输电塔架为算例,结合HFFB试验,分析了修正系数对结构响应计算的影响。研究结果表明,修正前后位移响应的背景分量计算值差异很小,但共振分量差别明显,偏差幅度达25%。对柔度较大的高耸结构,其共振分量在总响应中占比较高,需考虑荷载谱沿高度的变化;对于沿高度减小或增大的风速谱而言,现有荷载谱沿高度不变的分段估计法将高估或低估结构的位移响应。本文方法具有更高精度和更广的适用性。
基金Supported by the National Hi-tech Researchand Development Program(863program)of China(No.2001AA642030-1)Key Research Project of Zhejiang Province(No.2004C23028)New Century Excellent Scholar Program of Ministry of Education of the People's Republic of China(No.NCET-04-0549)
文摘The effects of operating parameters on desulfurization efficiency of a dual-alkali FGD process in a rotating-stream-tray(RST)scrubber are investigated.A dimensionless factor,ε,is proposed in this study to predict desulfurization efficiency of this dual-alkali FGD system.ε represents the desulfurization ability of a dual alkali FGD system,determined by five main operating parameters such as sodium ion concentration,ratio of absorbent flow rate to flue gas flow rate,pH value of absorbent solution,ratio of sulfate ion to total sulfur ion in absorbent solution,and sulfur dioxide concentration of inlet flue gas.The empirical expression for predicting desulfurization efficiency at different temperatures is obtained through the experimental study and theoretical calculation.It provides useful guide for engineering design.