Study On The Wind Turbine Blade Site Precision Testing Technology Based On Laser Tracker

The wind energy source,on account of the serious energy and environment crisis,has gained a worldwide attention by virtue of its clean and renewable advantages.The primary way for wind power utilization is to transform the wind energy into electric energy by wind-driven generator.For the wind-driven generator,the wind turbine blade is the key component to collect wind energy,and its outline dimension accuracy has a major influence on safe operation of the whole generating set.However,due to the complicated outline and the large dimension,there is no detailed scheme for the outline dimension detection of the blade until now for the domestic producers.Therefore,the research utilizing the laser tracker to measure blade outline dimension can be of some significance for improving the service life of blade and increasing the efficiency of wind power generation.This dissertation is an important section of the research project,i.e.14391703 D,sponsored by the Science and Technology Bureau of Hebei Province.In general,the research primarily includes such contents: the three-dimensional modeling of the wind turbine blade,the detection scheme constituting of the blade outline,the restructuring and parameter extracting of the virtual blade model,and the software developing based on CATIA software.In the three-dimensional modeling process of the blade,the transformation relation between the primitive coordinate and the physical space coordinates of the airfoil was obtained through the study on structure,profile,and geometric parameter of the blade.Then,the three-dimensional model of the blade was constructed by CATIA software.As for the constituting detection scheme for wind turbine blade,the scheme was studied on the basis of the detection content analysis in combination with the measuring principle of laser tracker.Afterwards,the field test that includes the adjustment of blade attitude,the arrangement of measuring position,the establishment of workpiece coordinates,and the measurement of blade profile were implemented.With respect to model reconstruction and parameter extraction for wind turbine blade,according to the features of the point cloud data,the more ideal point cloud data was obtained through data pretreatment.By virtual of the point cloud data combing with the three-dimensiona modeling procedure,the model reconstruction of blade was accomplished in CATIA software,and the dimensional parameters to be verified were extracted by the definitions of relative parameters of blade.Finally,in order to achieve theautomatic process for three-dimensional modeling and parameter extracting and to improve the detective efficiency,the software named ‘three-dimensional modeling,reverse remodeling and parameter exaction for wind turbine blade' was developed via the second development function of CATIA.In this study,the laser tracker was utilized in the field detection of wind turbine blade.The method focusing on three-dimensional modeling and reverse remodeling of the blade was presented.The detection scheme utilizing the laser tracker for the outline dimension of blade was constituted.The software named ‘three-dimensional modeling,reverse remodeling and parameter exaction for wind turbine blade' was finished via CATIA.The detection scheme,which can overcome the difficulties on measurement of the blade profile,is proved feasible by the field test.Experimental result shows that the scheme can also improve the efficiency and accuracy in detecting process of the blade.