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风力发电塔作为一类特殊的高柔结构,顶部支撑的风机在工作状态下对塔身产生动态激励,目前的风电塔振动实测通常采用接触式传感器.为发展风电塔现场非接触测试技术,本文对激光遥测方法进行阐述,利用加速度计和激光遥测设备对某1.5 MW风电塔进行环境脉动激励下的动力实测,对两种仪器的现场使用及测试结果进行对比,分析遥测方法的优势.利用得到的多组实测信号,分别采用峰值拾取法和随机子空间识别法进行分析处理,获得该风电塔的自振频率.
As a kind of special high-soft structure, the wind turbine tower has the dynamic excitation of the tower body under the working condition, and the current wind tower vibration measurement usually adopts the contact sensor.In order to develop the field non-contact testing technology of wind power tower, The method of laser telemetry is described, the dynamic measurement of a 1.5 MW wind power tower under the environmental pulsation excitation is carried out by accelerometer and laser telemetry equipment, the field use and test results of the two instruments are compared, and the advantages of the telemetry method are analyzed. Of the group of measured signals, respectively, using the peak pick-up method and random subspace identification method for analysis and processing to obtain the natural frequency of the wind power tower.