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定日镜结构的动力风效应和风致疲劳损伤研究

DYNAMIC WIND-INDUCED VIBRATION AND FATIGUE DAMAGE ANALYSIS OF HELIOSTAT STRUCTURES
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摘要 典型的定日镜结构由下部立柱支撑扭矩梁、桁架、驱动传动系统及上部镜面板组成,一般位于平坦开阔地区,所受风荷载较大,风致振动较为显著。建立了某定日镜整体结构的精细化有限元模型,镜面尺寸为8 m×8 m,立柱高5 m。分布于镜面的脉动风荷载通过风洞试验测得,完成了定日镜整体结构在不同水平风向角和不同镜面仰角下的风振响应时程分析。分别基于雨流法、等效应力法、等效窄带法、等效宽带法,结合Miner疲劳线性累积损伤理论,实现了时域与频域内的定日镜结构关键部位在最不利风荷载工况下的风振疲劳损伤分析,并对各种方法得出的损伤值进行了比较,验证了疲劳损伤频域分析方法的有效性。 A typical heliostat consists of a supporting column, a torsion beam, a truss, a drive unit and a mirror. Heliostat structures, which are normally deployed in open rural areas, subject to strong wind and suffer from significant wind-induced vibration. A refined finite element model (FEM) of a typical heliostat was established for structural and fatigue analysis. The heliostat has a large mirror of 8 m×8 m size and a 5 m high column. Wind tunnel tests were carried out to measure fluctuating wind pressure on the mirror. The measured wind pressure was converted into time histories of wind forces, which were then applied to the FEM model of the heliostat. Subsequently, wind-induced dynamic responses of the heliostat structure were analyzed using the FEM model in the time domain for various cases of different wind angles and the elevation angles of the mirror. Finally, fatigue damage analysis of the key parts of the heliostat was performed in the time domain as well as in the frequency domain by employing four methods, i.e., the time domain rain-flow method, the equivalent stress method, the equivalent narrow band method and the equivalent wide band method. The comparison of fatigue damage results demonstrated the effectiveness of the frequency domain methods. The equivalent narrow band method and the equivalent wide band method showed advantages in computational efficiency and relatively good accuracy in the estimation of wind-induced fatigue damage ofheliostat structures.
作者 黄嵩 黄铭枫 叶何凯 胡德军 HUANG Song1 , HUANG Ming-feng1 , YE He-kai1 , HU De-jun2 (1. Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, China; 2. Yaosha Holding Group Co., Ltd, Hangzhou 310011, China)
出处 《工程力学》 CSCD 北大核心 2017年第12期120-130,共11页 Engineering Mechanics
基金 国家自然科学基金项目(51578504)
关键词 定日镜结构 风致疲劳 疲劳损伤分析 雨流法 频域分析法 heliostat structures wind-induced fatigue fatigue damage analysis rain-flow method frequency domain analysis
作者简介 黄嵩(1992-),男,江西南昌人,硕士生,从事结构风工程研究(E—mail:zjuhs@hotmail.com);;通讯作者:黄铭枫(1976-),男,浙江诸暨人,教授,博士,从事结构风工程研究(E-mail:mfhuang@zju.edu.cn).;叶何凯(1993-),女,浙江宁波人,硕士生,从事结构风工程研究(E—mail:yhknne@163.com);;胡德军(1974-),男,浙江兰溪人,高工,工程硕士,浙江耀厦控股集团总工程师,从事专业建筑施工技术(E-mail:549296295@qq.com).
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