臺風是世界上最具毀滅性的自然災害之一。每年臺風的發(fā)生都會造成巨大的經(jīng)濟損失和嚴重的人員傷亡事故。因此,分析在臺風影響區(qū),作用在風敏感結構（高層建筑、大跨結構等）上的脈動風荷載特性是非常重要的。脈動風的相干結構是風荷載計算中一個重要的中間參數(shù),是準確估算風荷載和風振響應的關鍵因素。本文將基于近地面臺風場的實測數(shù)據(jù)的建立脈動風的相干結構,系統(tǒng)分析相干結構的特征及其對湍流間歇性、高斯特性、峰值因子和陣風因子的影響。風速實測數(shù)據(jù)基于以下準則篩選。首先,基于《中國地面氣象觀測規(guī)范》對風速計進行校準;其次,若出現(xiàn)監(jiān)測儀器故障或者電壓不平衡的情況,摒棄該段所得的風速數(shù)據(jù);然后,基于可移動的風速觀測系統(tǒng),獲得了臺風和常態(tài)風工況下的部分監(jiān)測數(shù)據(jù),并分別對臺風和常態(tài)風工況下,脈動特性進行比較分析�；谂_風“黑格比”及良態(tài)風實測數(shù)據(jù),提取了湍流相干結構,并分析了其主要變化特征對湍流特性的影響。采用離散小波變換方法,研究了多尺度相干結構對湍流特性的影響。通過分析湍流相干結構的特點,本文提出了一種小波系數(shù)譜分析方法,該方法結合了連續(xù)小波大尺度分辨率較高和AR模型（自回歸模型）譜估計頻率分辨率較高的特點,得到了相... 

【文章來源】：哈爾濱工業(yè)大學黑龍江省 211工程院校 985工程院校

【文章頁數(shù)】：94 頁

【學位級別】：碩士

【文章目錄】：
Acknowlegements
摘要
Abstract
Chapter 1 Introduction
    1.1 Project origin and the purpose and significance of the study
        1.1.1 Project sources
        1.1.2 The purpose and significance of the study
    1.2 Research study and analysis
        1.2.1 Site measurement of Typhoon wind field
        1.2.2 Characteristics of turbulent coherent structures
        1.2.3 Evolutionary spectra estimation using wavelets
    1.3 The main contents
Chapter 2 Turbulence characteristics and field measurement
    2.1 Introduction
    2.2 Optimization of observation system
    2.3 Measuring Normal wind and typhoons near the earth and analysis their fluctuating characteristic
        2.3.1 Introduction of observation site
        2.3.2 Typhoon Hagupit
    2.4 Characteristic analysis of Hagupit typhoons and normal wind
        2.4.1 Quality control and data processing of measured data
        2.4.2 Hagupit Typhoons and normal wind average characteristic analysis
        2.4.3 Analysis of fluctuating wind characteristics of hagupit typhoon andnormal wind
    2.5 The Chapter Summary
Chpater 3 Analysis of characteristics of turbulent coherence structure
    3.1 Introduction
    3.2 Extraction of turbulent coherent structures
        3.2.1 Coherent structures of turbulence theory and method
        3.2.2 Extraction of multi-scale coherence structures using discrete Wavelet transform
        3.2.3 Coherent structure extraction method (DWT )
        3.2.4 Results of Discrete wavelet Transform
    3.3 Analysis of characteristics of turbulent coherent structures
        3.3.1 Using continuous Wavelet transforms method to extract the coherent structure
        3.3.2 Coherent structure in normal air extraction
        3.3.3 Typhoon hagupit coherent structure extraction results
        3.3.4 Spectral analysis principle of wavelet coefficients
        3.3.5 Characteristic analysis of coherent structure
    3.4 Analysis of influence of turbulent coherent structures
        3.4.1 Effect of correlation coefficient
        3.4.2 Influence on the turbulent intermittence
        3.4.3 Effect on turbulent Gauss
        3.4.4 Peak gust factor and impact factor
    3.5 The chapter summary
Chapter4 Straightforward approach based in discrete wavelet transform for estimating the evolutionary power spectral density of nonstationary winds
    4.1 Introduction
    4.2 Discrete wavelet transform
    4.3 Family of Daubechies Mother wavelet functions
    4.4 Field measurements and speed characteristics of winds produced by typhoon hagupit
    4.5 Methodology for estimating the evolutionary power density of anonstationary random process
    4.6 Results and discussion
    4.7 The chapter summary
Concluding remarks
References



本文編號：3592770