全風向來流非高斯風場風機疲勞壽命可靠性分析

雙妙; 宋波

doi:10.13374/j.issn2095-9389.2017.09.020

全風向來流非高斯風場風機疲勞壽命可靠性分析

doi: 10.13374/j.issn2095-9389.2017.09.020

雙妙^1,2, ,,
宋波^1,2

1) 北京科技大學土木與資源工程學院, 北京 100083
2) 北京科技大學強震區軌道交通工程抗震研究北京市國際科技合作基地, 北京 100083

基金項目:

國家自然科學基金資助項目(51178045)

高校2016年度引智項目資助項目(110000201420160126)

北京科技大學與臺北科技大學專題聯合研究計劃資助項目(TW201601)

詳細信息

中圖分類號: TU311.3
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出版歷程
- 收稿日期: 2017-01-11

Reliability analysis of the fatigue life of wind turbines under a non-Gaussian wind field with a full-direction inflow

SHUANG Miao^{1,2
, ,},
SONG Bo^1,2

1) School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
2) Beijing International Cooperation Base for Science and Technology-Aseismic Research of the Rail Transit Engineering in the Strong Motion Area, University of Science and Technology Beijing, Beijing 100083, China

摘要

摘要: 在Hermite矩模型基礎上,根據Kaimal譜生成某典型風機結構正常風速條件下,三種不同概率特性風場(高斯、非高斯硬化和軟化),在考慮來流風向和平均風速聯合概率密度條件下,以塔架基礎連接處為例,對風機進行疲勞壽命可靠性分析.由葉片的氣動模型和多體動力,計算出風機的動力響應,并對響應的時域和頻域特性進行分析.基于線性損傷累積理論和Paris公式,對來流全風向條件下的裂紋形成壽命和裂紋擴展壽命進行了詳細討論.結果表明,裂紋形成壽命對風荷載的非高斯性較為敏感,而裂紋擴展壽命對風荷載的非高斯性并不敏感,需要考慮風荷載的非高斯性對風機結構疲勞損傷的影響.此外,在考慮全風向來流條件下,疲勞裂紋形成和擴展階段的失效位置相同,均在主導風向上.
- 全風向 /
- 非高斯性 /
- 雨流計數法 /
- 裂紋形成 /
- 裂紋擴展
Abstract: Using the Hermite moment model, three types of wind fields with different probability characteristics, namely the Gaussian, hardening non-Gaussian, and softening non-Gaussian processes, were generated via the Kaimal spectrum for a typical wind turbine under operational conditions. Reliability analysis of the fatigue life of the wind turbine was performed by taking tower base connections as an example with consideration of the joint probability density distribution of the wind direction and mean wind speed. The dynamic response was calculated by an aerodynamic model of the blade and multi-body dynamics, and the time-and frequency-domain characteristics of the response were analyzed. Using linear damage accumulation theory and the Paris equation, the fatigue crack initiation life and crack growth life of the turbine were discussed in detail. Fatigue estimation shows that the crack initiation life of the turbine is more sensitive to non-Gaussian winds, whereas its crack propagation life is less sensitive to the non-Gaussian characteristics of wind load. The influence of the non-Gaussian characteristics of wind load on the fatigue damage of the wind turbine should be considered. In terms of the full-direction inflow, the failure positions of the crack initiation and propagation stages are identical and in the dominant wind direction.
- full-direction inflow /
- non-Gaussian characteristic /
- rain-flow counting method /
- crack initiation /
- crack propagation

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