风电塔在台风作用下的振动监测与分析

为了得到海上风电塔在“苏迪罗”台风直接作用下的振动响应特性,通过在风电塔上安装低频振动传感器和分量加速度计,对两座5 MW的海上风电塔样机开展振动监测.基于实测数据,对比分析风电塔固有频率、阻尼比等频域特性在台风前后以及台风过程中的变化情况,同时分析了振动幅度、加速度有效值、振动烈度等时域特性随台风的变化情况和台风过程中偏航冲击力的异常情况.监测结果表明:风机塔的振动模态参数对其法兰盘螺栓松动不敏感;法兰盘及其紧固螺栓在台风作用下出现螺栓松动后会表现出明显的局部颤振现象;台风过程中偏航冲击振动更加频繁,而且振动加速度大、持续时间长,对风电塔安全运行威胁较大.研究成果可为风机塔的抗风设计、运营安全监测提供参考.

Vibration Monitoring and Analysis of Offshore Wind Tower Under the Influence of Typhoon

To get the vibration response under the action of "Soudelor" typhoon,two 5 MW offshore wind towers are monitored by installing low frequency vibration sensors and accelerometers.Based on the statistics,the vibration response under the action of typhoon is analyzed.Also vibration amplitude,acceleration rms,and vibration intensity are analyzed under the changes of typhoon.On the basis of the vibration characteristic analysis,it is found that the first three natural frequency,damping ratio and mode of the two wind tower only change a little.After inspection,it is caused by loose bolt.The monitoring results show that the vibration mode parameters of the wind tower are not sensitive to the looseness of the flange bolts.The obvious local flutter phenomenon of flange and fastening bolt will be shown when the bolt looses after the action of the typhoon.During the typhoon,the impact vibration happens more frequently and lasts long,which increases the safety threat to the wind tower.This research can provide the reference for wind resistance and operation safety monitoring of the wind tower.