基于相干结构的台风非平稳湍流特性

发布时间：2022-01-16 13:39

　　台风是世界上最具毁灭性的自然灾害之一。每年台风的发生都会造成巨大的经济损失和严重的人员伤亡事故。因此,分析在台风影响区,作用在风敏感结构（高层建筑、大跨结构等）上的脉动风荷载特性是非常重要的。脉动风的相干结构是风荷载计算中一个重要的中间参数,是准确估算风荷载和风振响应的关键因素。本文将基于近地面台风场的实测数据的建立脉动风的相干结构,系统分析相干结构的特征及其对湍流间歇性、高斯特性、峰值因子和阵风因子的影响。风速实测数据基于以下准则筛选。首先,基于《中国地面气象观测规范》对风速计进行校准;其次,若出现监测仪器故障或者电压不平衡的情况,摒弃该段所得的风速数据;然后,基于可移动的风速观测系统,获得了台风和常态风工况下的部分监测数据,并分别对台风和常态风工况下,脉动特性进行比较分析。基于台风“黑格比”及良态风实测数据,提取了湍流相干结构,并分析了其主要变化特征对湍流特性的影响。采用离散小波变换方法,研究了多尺度相干结构对湍流特性的影响。通过分析湍流相干结构的特点,本文提出了一种小波系数谱分析方法,该方法结合了连续小波大尺度分辨率较高和AR模型（自回归模型）谱估计频率分辨率较高的特点,得到了相... 

【文章来源】：哈尔滨工业大学黑龙江省 211工程院校 985工程院校

【文章页数】：94 页

【学位级别】：硕士

【文章目录】：
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



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