English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 56829/90534 (63%)
造访人次 : 12274669      在线人数 : 74
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜寻范围 查询小技巧:
  • 您可在西文检索词汇前后加上"双引号",以获取较精准的检索结果
  • 若欲以作者姓名搜寻,建议至进阶搜寻限定作者字段,可获得较完整数据
  • 进阶搜寻


    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/44647


    题名: 橫風向振動對三維方柱體所受風力特性的影響
    其它题名: Aerodynamics of a 3-D Square Cylinder under Acrosswind Vibrations
    作者: 陳若華;鄭啟明;盧博堅
    贡献者: 淡江大學土木工程學系;淡江大學水資源及環境工程學系
    关键词: 高層建築;風洞;強制振動;鎖定;High-rise building;Wind tunnel;Forced oscillation;Lock-in
    日期: 1997-03
    上传时间: 2013-03-12 11:07:27 (UTC+8)
    出版者: 新竹市:中華民國力學學會
    摘要: 本文使用邊界層流場中三維方柱橫風向強制振動實驗,探討高層建築風擺現象對於其所受風力特性的影響。實驗以流場特性、橫風向振幅及振頻為控制條件,量測方柱模型的風力係數、頻譜與相關長度等氣動力性質。實驗結果顯示橫風向強制振動對於順風向風力影響並不明顯,對於橫風向風力則有密切的關聯性。振頻與渦散頻率接近時,二者間會發生共振現象,振幅較大則進一步發生鎖定現象。擾動性昇力係數及相關尺度隨共振現象的發生而增大。增大紊流強度會減弱渦散強度及強制振動所引發的共振與鎖定現象。Wind tunnel experiments were conducted to study the aerodynamics of a 3-D square cylinder under forced vibration. Turbulent boundary layers, vibration amplitude and frequency were chosen as controlled parameters to investigate the wind load characteristics, such as drag and lift coefficients, force spectra and spatial Correlation of wind loads. Experimental results indicate that the acrosswind vibration affects strongly on the lift force and casts little influence on the drag force. When the frequency of forced vibration closes to the vortex shedding frequency, synchronization of these two occurs. Increasing the vibration amplitude, the vortex shedding frequency will "lock-in" to the vibration frequency and the lift coefficient and force length scale would subsequently increase. Presence of turbulence would weaken the vortex shedding intensity, diminish the synchronization and lock-in phenomenon.
    關聯: 力學:中國力學學會期刊=The Chinese Journal of Mechanics 13(1),頁33-44
    显示于类别:[美國研究所] 專書之單篇
    [土木工程學系暨研究所] 期刊論文

    文件中的档案:

    档案 大小格式浏览次数
    index.html0KbHTML251检视/开启

    在機構典藏中所有的数据项都受到原著作权保护.

    TAIR相关文章

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - 回馈