脉动风场的模拟方法及其在输电线路风振计算中的应用
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摘要
针对脉动风场各种模拟方法的适用性问题,在相同的输电塔线实例上进行模拟方法的应用,对比各种方法的计算效率和计算结果,分析各种模拟方法的适用性和等价性,最后探讨单塔和塔线体系计算结果的差异。研究表明:基于POD分解的WAWS法不存在风速互谱密度矩阵无法分解的情况,计算效率较高,因此推荐使用。考虑三维风场后响应的脉动均方根比一维风场大;塔线体系中计算得到的响应均方根比单塔大。
Different wind field simulation methods are applied to the same transmission line to illustrate whether these methods are suitable to simulate fluctuating wind field.The calculating efficiency and results based on these methods are compared and the applicability of these methods is studied.The difference between the results based on the model of an isolated tower and transmission-line system is also investigated.Results from this study show that,the WAWS method with POD decomposition is highly recommended because this method is quite efficient and does not encounter the problem that the cross spectrum matrix of wind velocities cannot be decomposed.The root-mean-square responses of the transmission tower considering three dimensional wind fields is larger than those considering one dimensional wind field.The root-mean-square responses of the tower line system are also larger than those of the isolated tower.
Different wind field simulation methods are applied to the same transmission line to illustrate whether these methods are suitable to simulate fluctuating wind field.The calculating efficiency and results based on these methods are compared and the applicability of these methods is studied.The difference between the results based on the model of an isolated tower and transmission-line system is also investigated.Results from this study show that,the WAWS method with POD decomposition is highly recommended because this method is quite efficient and does not encounter the problem that the cross spectrum matrix of wind velocities cannot be decomposed.The root-mean-square responses of the transmission tower considering three dimensional wind fields is larger than those considering one dimensional wind field.The root-mean-square responses of the tower line system are also larger than those of the isolated tower.
引文
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[2]SHINOZUKA M,JAN C M.Digital simulation of ran-dom processes and its application[J].Journal of Soundand Vibration,1972,25(1):111-128.
[3]YANG W W,CHANG T Y P,CHANG C C.An effi-cient wind field simulation technique for bridges[J].Journal of Wind Engineering and Industrial Aerody-namics,1997,(67/68):697-708.
[4]DEODATIS G.Simulation of ergodic multivariate sto-chastic processes[J].Journal of Engineering Mechan-ics,1996,122(8):778-787.
[5]GERCH W,YONEMOTO J.Synthesis of multivariaterandom vibration systems:a two-stage least squaresARMA model approach[J].Journal of Sound and Vi-bration,1977,52(4):553-565.
[6]LI Y,KAREEM A.ARMA representation of wind field[J].Journal of Wind Engineering and IndustrialAerodynamics,1995,121(1):415-427.
[7]曾宪武,韩大建.大跨度桥梁风场模拟方法对比研究[J].地震工程与工程振动,2004,24(1):135-140.
[8]鲍侃袁,沈国辉,孙炳楠.双曲冷却塔的脉动风荷载模拟和风致响应研究[J],浙江大学学报(工学版),2010,44(5):955-961.
[9]祝贺.基于AR模型的输电塔结构风荷载模拟技术[J].吉林电力,2006,34(2):20-23.
[10]贾瑞庆,杨振伟,代晓光,等.基于时域法的输电塔抗风研究[J].水电能源科学,2009,27(5):197-200.
[11]白海峰,李宏男.大跨越输电塔线体系随机脉动风场模拟研究[J].工程力学,2007,24(7):146-151.
[12]韩枫,肖正直,李正良.1000KV汉江大跨越输电塔线体系三维脉动风场模拟[J].高电压技术,2009,35(5):999-1004.
[13]李黎,胡亮,樊剑,等.具有桥塔风效应的桥梁风场数值模拟[J].振动与冲击,2007,26(5):14-18.
[14]沈国辉,袁光辉,楼文娟,等.覆冰脱落对输电塔线体系的动力冲击作用研究[J].工程力学,2010,27(5):210-217.
[15]DAVENPORT A G.The dependence of wind load uponmeteorological parameters[A].Proceedings of the In-ternational Research Seminar on Wind Effects on Build-ing and Structures[C],University of Toronto Press,Toronto,1968:19-82.
[16]SOLARI G,PICCARDO G.Probalistic 3-D turbulencemodeling for gust buffeting of structures[J].Probabi-listic Engineering Mechanics,2001,16:73-86.
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