风电叶片全尺寸结构试验三维挠度测量研究

Research of 3D Deflection Measurement in Full-scale Structural Testing for Wind Turbine Blade

对风电叶片进行全尺寸结构试验时需要测量其挠度变形,目前使用拉绳传感器测量,但拉绳传感器只能实现单一方向测量,测量误差大且维数单一。为了解决上述问题,推导一种用于叶片三维挠度精准测量的数学模型,进一步结合超宽带无线测距技术搭建了无线测量系统,使用该系统进行叶片静力加载挠度测量试验,并与激光跟踪仪测量结果进行对比。结果表明:该技术可以获得较为准确的挠度值,测量的X、Y、Z三个方向的叶片变形量的均方根误差分别为12.77、15.91、19.87 mm,符合测试要求。

The deflection should be measured in full-scale structural testing of wind turbine blade.At present,a draw-wire displacement sensor is used to measure the deflection.But the draw-wire displacement sensor can only measure in a single direction,and the measurement error is large and the dimension is single.In order to solve these problems,a mathematical model for accurate measurement of three-dimensional deflection of the blade was deduced.Furthermore,a wireless measurement system was built based on ultra wide band wireless ranging technology.The system was used for static load deflection measurement experiment of the blade,and the results were compared with those of laser tracker.The test results show that using the technology,accurate deflection values can be obtained,the root mean square errors of the measured blade deformation of X,Y,Z direction are 12.77,15.91 and 19.87 mm respectively,which meet the test requirements.