S型叶尖小翼对风轮振动频率影响的研究

马剑龙;汪建文;董波;魏海娇

振动与冲击 ›› 2013, Vol. 32 ›› Issue (24) : 110-116.

PDF(2184 KB)
PDF(2184 KB)
振动与冲击 ›› 2013, Vol. 32 ›› Issue (24) : 110-116.
论文

S型叶尖小翼对风轮振动频率影响的研究

  • 马剑龙1,2,汪建文1,2,董波1,魏海娇1
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Research on S-shaped Tip Vane Impact on Frequency of Vibration about Wind Wheel

  • MA Jian-long1,2,WANG Jian-wen1,2,DONG Bo1,WEI Hai-jiao1
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摘要

利用PULSE16.1结构振动分析系统,针对直径1.4m的小型水平轴风力机风轮分别在安装S型叶尖小翼与否的状态下进行静、动频测试,通过静频数据结合谱分析法识别风轮动频。研究发现,S型叶尖小翼导致风轮1、2阶振动静频下降,其对2阶振动静频的衰减幅值较1阶振动大,对同阶反对称振动静频的衰减作用较对称振动大,并具有显著调节风轮2阶反对称振动动频和对称振动动频间差值的效用。同时发现,S型叶尖小翼可有效改变风轮1、2阶振动动频曲线走势,从而有效调节风轮进入和脱离共振区的转速,这对于风轮最佳转速设计和避免共振设计具有较重要的意义。S型叶尖小翼对圆盘效应振动频率和轴向窜动效应振动频率影响很小,但在很大区域的转速范围内,圆盘效应振动动频曲线总是伴随风轮转速1倍频,并出现在1倍频振动带范围内,这一发现有可能为很多风力机叶片在远短于设计寿命期内频繁发生疲劳损伤事故提供新的解释。

Abstract

The tests of the static and dynamic frequency of the wind wheels about the small horizontal axis wind turbine which the diameters were 1.4m were done by using the PULSE16.1 system when the s-shaped tip vanes were installed or not, and each order frequency about the wind wheel was identified by the static frequency data and the spectral-analysis method. The study found that the 2-order static frequency decreased due to the tip vanes, the attenuation of the 2-order-vibration amplitude was bigger than the 1-order-vibration amplitude and the attenuation of the symmetric vibration frequency of the same order vibration was bigger than the antisymmetric vibration frequency. The s-shaped tip vanes can significantly adjust the difference between the antisymmetric vibration frequency and the symmetric vibration frequency of the 2-order vibration. The curve trend of the 1-order and 2-order vibration frequency can be changed effectively by the tip vanes, thus it can effectively adjust the enter speed and the break away speed of the resonance region, and this has important significance for the design of the best speed and avoiding resonance of the wind wheel. The s-shaped tip vanes had little effect on the vibration frequency of the disc effect and the axial movement, but the 1 octave curve is always accompanied by the dynamic frequency curve of the disc effect in a large area of speed range, and the dynamic frequency curve was in the 1 octave vibration band. This discovery may provide some new explanation about why the fatigue damage accident of the blades occurs frequently in the period which is much shorter than the design life.


关键词

风力机 / 风轮 / S型叶尖小翼 / 振动频率 / 影响

Key words

wind turbine / wind wheel / s-shaped tip vane / frequency of vibration / impact

引用本文

导出引用
马剑龙;汪建文;董波;魏海娇. S型叶尖小翼对风轮振动频率影响的研究[J]. 振动与冲击, 2013, 32(24): 110-116
MA Jian-long;WANG Jian-wen;DONG Bo;WEI Hai-jiao. Research on S-shaped Tip Vane Impact on Frequency of Vibration about Wind Wheel[J]. Journal of Vibration and Shock, 2013, 32(24): 110-116

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