Method for detecting bolts looseness of a wind turbine tower based on its vibration characteristics
HE Xianlong1, SHE Tianli1, XU Bing2, LI Jie2, CHEN Gang2 and CAO Guofu2
1. Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080;
2. Shanghai Investigation, Design and Research Institute Co. Ltd,Shanghai 200434
Abstract:The bolt looseness is a usual and serious disease of a wind turbine tower. Based on a large number of measurements, a conclusion was obtained that the first-order phase difference characteristic of a wind turbine tower is sensitive to its loose bolts of the flanges. Six wind turbine towers with loose bolts were measured and analyzed on their vibration parameters. After the bolts looseness, the variation of the first-order natural frequency was not found, the variation of its damping ratio and its first-order vibration mode were not obvious. At the same time, there were obvious sudden change in the phase difference of the upper and lower flanges despite the bolts looseness ratio was 6%. But the phase difference of the upper and lower didn’t show the sudden change after their fastening. The measurements show that the first-order phase difference characteristic of a wind turbine tower is more affected by its loose bolts of the flanges than other vibration characteristics. As a result, the first-order phase difference characteristic can express the bolts looseness of the flanges more accurately. The serious bolts looseness can be detected by the sudden increasing absolute values of the the phase difference of the upper and lower flanges. Based on the real measurements of the six wind turbine towers under different working conditions, the method in this paper is more reliable and more effective to detect the loosen bolts of a wind turbine tower rapidly.
何先龙1,佘天莉1,徐兵2,李杰2,陈刚2,曹国福2,. 基于塔筒振动特性识别风机塔螺栓松动的研究[J]. 振动与冲击, 2016, 35(14): 112-118.
HE Xianlong1, SHE Tianli1, XU Bing2, LI Jie2, CHEN Gang2 and CAO Guofu2. Method for detecting bolts looseness of a wind turbine tower based on its vibration characteristics. JOURNAL OF VIBRATION AND SHOCK, 2016, 35(14): 112-118.
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