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Student Number 92322072
Author Fu-Chuen Yang(楊富傑)
Author's Email Address 92322072@cc.ncu.edu.tw
Statistics This thesis had been viewed 1822 times. Download 1161 times.
Department Civil Engineering
Year 2004
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title 以HHT分析法研究陣風風場中建築物之表面風壓
Date of Defense 2005-06-24
Page Count 126
Keyword
  • Gusty flow
  • Hilbert-Huang Transform
  • Pressure coefficient
  • Wind tunnel experiment
  • Abstract This study experimentally investigates the pressure distribution on the surface of three-dimensional building model in an uniform flow and periodically varying flows. The experiments were carried out in an atmospheric boundary layer wind tunnel. This wind tunnel is equipped with a gust generator that can generate periodically varying flows of adjustable frequency. Flow condition includes one rectangular cylinder and one circular cylinder of smooth surface. Instantaneous fluctuating wind pressures were measured by an electronic pressure scanner. Based on the pressure measurement, the distributions of mean, rms pressure coefficients were calculated. Furthermore, Hilbert-Huang Transform (HHT) was used for the time-frequency domain analysis. The experimental results also revealed that the rms pressure coefficient increase under gusty wind. Also, the probability of pressure fluctuations for positive pressure are close to the Gaussian distribution function. On the other hand, negative pressure side was skewed and did not necessary follow Gaussian distribution.
    Table of Content 中文摘要I
    英文摘要II
    圖目錄VI
    表目錄X
    符號表XI
    第一章 緒論1
    1.1 前言1
    1.2 研究動機2
    1.3 研究內容及大綱3
    第二章 理論基礎與文獻回顧4
    2.1 均勻流場特性4
    2.2 陣風4
    2.3 風流經建築物之行為5
    2.4 壓力係數量測6
    2.4.1 表面風壓6
    2.4.2 設計風壓規範7
    2.5 頻譜分析理論10
    2.5.1 傅立葉(Fourier)頻譜分析10
    2.5.2 HHT(Hilbert-Huang Transform)時間-頻率分析12
    2.6 前人文獻回顧14
    第三章 實驗設備與方法21
    3.1 大型環境風洞與陣風產生器21
    3.1.1 大型環境風洞21
    3.1.2 陣風產生器(Gust generator)22
    3.2 風速量測方法23
    3.3 壓力量測方法25
    3.3.1 前人研究25
    3.3.2 壓力量測儀器27
    3.3.3 儀器校正28
    3.3.4 壓力量測30
    3.4 實驗方法30
    3.4.1 穩態風場模擬30
    3.4.2 建築物模型31
    3.4.3 實驗數據採樣技巧32
    3.5 頻譜分析方法32
    3.5.1 傅立葉頻譜分析32
    3.5.2 HHT時間-頻率分析33
    第四章 結果與討論50
    4.1 陣風風場機制50
    4.1.1 陣風平均風速50
    4.1.2 陣風流場側方向的均勻性51
    4.1.3 紊流強度51
    4.1.4 HHT分析結果52
    4.2 圓柱體之表面風壓53
    4.2.1 穩態風場53
    4.2.2 陣風風場55
    4.2.3 機率分佈57
    4.2.4 HHT分析結果59
    4.3 寬迎風面矩柱體之表面風壓62
    4.3.1 穩態風場62
    4.3.2 陣風風場64
    4.3.3 機率分佈65
    4.4 窄迎風面矩柱體之表面風壓66
    4.4.1 穩態風場66
    4.4.2 陣風風場68
    4.4.3 機率分佈69
    4.4.4 HHT分析結果70
    4.5 準穩態假設72
    第五章 結論與建議117
    5.1 結論117
    5.2 建議119
    參考文獻120
    附錄 A:相關函數124
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    Advisor
  • Chia R. Chu(朱佳仁)
  • Files
  • 92322072.pdf
  • approve immediately
    Date of Submission 2005-07-13

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