学术
摘 要:
为了保证风力机在复杂的载荷下安全、稳定运行，提出了一种用于分析风力机叶片在拍打方向上的疲劳概率模型．该模型利用应力一强度干涉理论，并且假定风速服从威布尔分布，考虑风速的不稳定性作用，在风力机叶片上分布载荷的不确定因素，并假定风力机的设计寿命为20a．在拍打方向上的疲劳概率通过一阶可靠性方法计算．计算了风速为12m／s，湍流度为I=0．02、0．1、0．15、0．2的4种情况，并对耿贝尔分布、三参数威布尔分布以及威布尔分布3种分布进行了比较．通过比较得知。耿贝尔分布的直线性比较好，而三参数威布尔分布以及威布尔分布都有尾部现象．最后，以600kW风力机叶片为例，通过应力-强度干涉理论来对叶片的可靠性进行估算．计算结果表明该台风力机符合可靠性要求．[著者文摘]
文章出处:
《北京工业大学学报》-2005年31卷6期 -617-621页
栏目信息:
分 类 号:
文献标识码:
A
文章编号:
0254-0037（2005）06-0617-05
Load Estimation and Reliability Analysis of Wind Turbine＇s Blade in Flap-wise
XIAO Jin-song, ZHANG Chuan-jing （Enhanced Heat Transfer and Energy Conservation, Key Lab of Ministry of Education, Beijing University of Technology, Beijing 100022, China）
Abstract:
In order to ensure wind turbine running safely and steadily in complicated environment, a probabilistic model for analysis of the failure of a wind-turbine rotor blade in flap-wise bending is presented. This model capitalizes on stress-strength interference theory and curve, and Weibull model about the wind＇s distribution is considered. This model accounts for the uncertainties about the loads acting on the wind-turbine rotor blade by the unstable wind distribution. A 20-year design lifetime is assumed. The probability of fatigue failure in flap-wise bending of the rotor blade is calculated by means of a first-order reliability method. Four situations are calculated when turbulence intensities are 0.02, 0.1, 0.15, 0.2 and wind velocity is 12 m/s. Conclusions can be draun through comparison： linearity of Gumbel distribution is better than one of three-parameter Weibull distribution and Weibull distribution, because the two distributions have some tails. At last, Stress-strength Interference Theory model is validated by 600 kW wind turbine blade. Conclusion has chown that wind turbine rotor blade can meet the design standards.[著者文摘]
Key words:
wind-turbine rotor blade; flap-wise; probability; stress-strength interference theory
基金资助:
教育部归国留学人员科研启动基金资助项目（M0504200101）.
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