基于响应面的大型输电塔结构有限元模型动力修正
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摘要
针对基于灵敏度分析的有限元模型动力修正方法计算效率较低、迭代收敛慢的不足,将响应面法引入500 kV大跨越输电塔基准模型修正。选择塔脚弹性支承刚度为修正参数,依次进行单因素试验、样本值计算、响应面建立与分析、参数优化。修正后,有限元模型非常准确地复现了单塔横、纵两个方向的一阶弯曲动态特性,修正效果与基于灵敏度分析的模型修正方法接近,证明响应面法在有限元模型动力修正领域的应用价值。还探讨了塔架结构修正参数的选取问题,为相关研究提供参考。
To conquer deficiencies of poor computational efficiency and slow convergence of traditional sensitivity analysis-based finite element(FE) model updating methodology used widely,response surface methodology was introduced into a 500kV large transmission tower's dynamic FE model updating.Based on authors' former contributions,elastic stiffnesses of the tower's three directional foot bearings were selected as parameters to be updated.Key steps in updating process including one factor test,sample on FE platform,building and analyzing response surface and parameter optimization were presented in succession,then response surface-based dynamic FE model updating was completed.The updated tower model accurately recurred the structure's primary and secondary natural frequencies,and its effect was close to that of the sensitivity analysis-based methodology,its application value was proved.The problem of parameter selection for model updating of pylon structures was also explored.
To conquer deficiencies of poor computational efficiency and slow convergence of traditional sensitivity analysis-based finite element(FE) model updating methodology used widely,response surface methodology was introduced into a 500kV large transmission tower's dynamic FE model updating.Based on authors' former contributions,elastic stiffnesses of the tower's three directional foot bearings were selected as parameters to be updated.Key steps in updating process including one factor test,sample on FE platform,building and analyzing response surface and parameter optimization were presented in succession,then response surface-based dynamic FE model updating was completed.The updated tower model accurately recurred the structure's primary and secondary natural frequencies,and its effect was close to that of the sensitivity analysis-based methodology,its application value was proved.The problem of parameter selection for model updating of pylon structures was also explored.
引文
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[2]任伟新,陈华斌.基于响应面的桥梁有限元模型修正[J].土木工程学报,2008,41(12):73-78.
[3]汪江,杜晓峰,田万军,等.500kV淮蚌线淮河大跨越输电塔振动测试与模态识别[J].中国电力,2009,42(2):30-33.
[4]何顶顶.大跨越输电塔损伤模拟分析与模型实验研究[D].南京:东南大学,2009.
[5]查小鹏.高耸结构风致疲劳安全预警的理论和方法[D].武汉:武汉理工大学,2008.
[6]赵滇生,金三爱.有限元模型对输电塔架结构动力特性分析的影响[J].特种结构,2004,21(3):8-11.
[7]徐静,李宏男,李钢,等.考虑桩-土-结构动力相互作用的输电塔地震反应分析[J].工程力学,2009,26(9):24-29.
[8]刘爱霞,石湘,李华军.一种海洋平台广义模型修正方法的研究[J].振动与冲击,2007,26(1):112-116.
[9]Mottershead J E,Mares C,Friswell M I,et al.Selection andUpdating of Parameters for an Aluminium Space-Frame Model[J].Mechanical Systems and Signal Processing,2000,14(6):923-944.
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