Experiment on vibration frequency and stress characteristics of wheel in wind turbine
Ma Jianlong1,2, Wang Jianwen1,2, Dong Bo1, Wei Haijiao1
1.School of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot, Inner Mongolia 010051, China; 2.Mi-nistry of Education Key Laboratory of Wind Energy and Solar Energy Utilization Technology, Hohhot, Inner Mongolia 010051, China
Abstract：The static natural frequency and dynamic vibration frequency of three 1.4 m diameter wheels in a small horizontal-axis wind turbine were measured by using Pulse16.1 structure vibration analysis system. It was identified that the aerodynamic load has a weaker effect on the 2nd-order or less dynamic frequency of vibration; furthermore, the load affects the 1st and 2nd-dynamic frequencies of anti-symmetric vibration slightly dominated than on those of symmetric vibration. The centrifugal force exhibits a relatively remarkable influence on the 2nd or less order dynamic frequency of vibration,especially the force can affect the 1st and 2nd-order dynamic frequency of symmetric vibration more greatly than on those of anti-symmetric vibration. Besides, the vibration stress caused from disc effect is higher than the other 2nd or less vibration stresses. The vibration stress caused from axial movement effect is in between the 1st and 2nd order vibration stresses. This observation is quite different from the vibration stress measured from a static wind wheel. Clearly, it is inappropriate that the dynamic vibration stress is analyzed indirectly through measuring the stresses in a static wheel. These results can provide some new ideas and a theoretical support in analysis of fatigue damage or break which frequently occurs in wind turbine wheels in a period of time that is much shorter than the design life span of a wheel. Meanwhile, they can provide a theoretical support in designing a reasonable dynamic performance for the wheel in a small-scale wind turbine.
马剑龙,, 汪建文,, 董波, 魏海娇. 风力机风轮振动频率及应力特性试验研究[J]. 排灌机械工程学报, 2013, 31(11): 980-986.
Ma Jianlong,, Wang Jianwen,, Dong Bo, Wei Haijiao. Experiment on vibration frequency and stress characteristics of wheel in wind turbine. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(11): 980-986.
[1]Spera D A. Wind Turbine Technology[M]. USA:ASME Press,1995.[2]Osgood R, Bir G, Mutha H. Full-scale modal wind turbine tests:Comparing shaker excitation with wind excitation[C]//Conference Proceedings of the Society for Experimental Mechanics Series,2011:113-124.[3]Griffith D T,Carne T G. Experimental modal analysis of 9-meter research-sized wind turbine blades[C]//Conference Proceedings of the Society for Experimental Mechanics Series,2011:1-14.[4]Kusnick J F,Adames D E. Vertical axis wind turbine operational modal analysis in sheared wind flow[C]//Conference Proceedings of the Society for Experimental Mechanics Series,2012:333-344.[5]Garcia M,Reich A,Zhu Y J,et al. Real-time dynamic measurements of a wind turbine rotor blade using modal filtering[C]//Conference Proceedings of the Society for Experimental Mechanics Series,2009:214-217.[6]Carne T G, Nord A R. Modal testing of a rotating wind turbine[C]//Proceedings of the International Modal Analysis Conference & Exhibit,1982:102.[7]Deines K, Marinone T,Schultz R, et al. Modal analysis and SHM investigation of CX-100 wind turbine blade[C]//Conference Proceedings of the Society for Experimental Mechanics Series,2011:413-438.[8]Paulsen U S, Schmidt T, Erne O. Developments in large wind turbine modal analysis using point tracking video grammetry [C]//Conference Proceedings of the Society for Experimental Mechanics Series,2011:187-198.[9]Ganeriwala S N,Yang J,Richardson M. Using modal analysis for detecting cracks in wind turbine blades[J]. Sound and Vibration,2011,45(5):10-13.[10]张立勋,刘小红,张松,等. 基于多种UDF方法的变桨距垂直轴风力机性能分析[J]. 农业机械学报,2012,43(9):120-124. Zhang Lixun,Liu Xiaohong,Zhang Song,et al. Perfor-mance analysis of variable-pitch vertical axis wind turbine based on various UDF methods [J]. Transactions of the Chinese Society for Agricultural Machinery,2012,43(9):120-124.(in Chinese)[11]孙屹刚,徐大林,顾兆丹,等. 水平轴风力机变桨载荷分析与计算[J]. 江苏大学学报:自然科学版,2010,31(6):635-639. Sun Yigang,Xu Dalin,Gu Zhaodan,et al. Analysis and calculation of variable pitch load for horizontal axis wind turbine [J]. Journal of Jiangsu University:Natural Science Edition,2010,31(6):635-639.(in Chinese)[12]王磊,陈柳,何玉林,等. 基于假设模态法的风力机动力学分析[J]. 振动与冲击,2012,31(11):122-126. Wang Lei,Chen Liu,He Yulin,et al. Dynamic analysis of a wind turbine base on assumed mode method[J]. Journal of Vibration and Shock,2012,31(11):122-126.(in Chinese)[13]马剑龙,汪建文,刘博,等. 翼型及叶片安装方式变化对风轮各阶固有频率影响的研究[J]. 工程热物理学报,2013,34(6):1069-1073. Ma Jianlong,Wang Jianwen,Liu Bo,et al. Research on impact of airfoil changes and blade installation on each order natural frequency of wind wheel[J]. Journal of Engineering Thermophysics,2013,34(6):1069-1073.(in Chinese)
