遮挡型格构式塔架风力特性试验研究

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摘要基于高频天平测力技术，对遮挡型格构式塔架模型进行不同遮挡距离、不同试验风速下的风洞试验，研究其对遮挡型格构式塔架顺风向、橫风向、扭转向平均风力系数以及对顺风向、橫风向基底弯矩功率谱的影响，并在此基础上利用最小二乘法对两个方向的功率谱进行了参数拟合。结果表明，遮挡距离是影响平均风力系数的重要影响因素，而试验风速仅对橫风向平均风力系数有影响；与平均风力系数相反，对于基底弯矩功率谱而言，试验风速对其影响显著，而遮挡距离在整个频段上对功率谱密度影响并不大；特定工况下极值脉动功率谱拟合效果较好，可用于遮挡型格构式塔架动力响应的频域计算中。

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	李正良1
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	刘欣鹏1
	晏致涛1
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	肖正直1
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	俞登科1

关键词 ：关键词：遮挡型格构式塔架, 风洞试验, 风力系数, 功率谱, 解析模型

Abstract：Based on high-frequency-force-balance technique, a model of occluded latticed tower was tested in wind tunnel under the conditions of 3 kinds of wind speed, and 6 kinds of occluding distances to investigate the mean force coefficients and power spectrum densities(PSDs) of the base moment. In light of these results, the analytical models of PSD of the base moment in two directions were established by applying least-square method. It is found that, concerning occluding distance and wind speed, occluding distance is more important element of affecting the mean force coefficients. However, wind speed is more important than occluding distance element for PSD of base moment；The analytical models of PSD of the base moment are in good agreetment with the experimental results obtain by wind tunnel tests, which can be used in the evaluation of wind-induced dynamic responses of occluded latticed tower in frequency domain.

Key words： occluded latticed tower wind tunnel test wind force coefficient power spectrum

收稿日期: 2014-03-10 出版日期: 2015-06-15

引用本文:

李正良1，2，刘欣鹏1，晏致涛1，2，肖正直1，2，俞登科1. 遮挡型格构式塔架风力特性试验研究[J]. 振动与冲击, 2015, 34(11): 99-104.
LI Zheng-liang1,2，LIU Xin-peng1，YAN Zhi-tao1，2，XIAO Zheng-zhi1，2，YU Deng-ke1. Experimental Study of Wind Force on Occluded Latticed Tower. JOURNAL OF VIBRATION AND SHOCK, 2015, 34(11): 99-104.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2015/V34/I11/99

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