Digital Flexible Detection Method for Rotor Blade Twist Angles
The twist angles of helicopter rotor blades had a direct impact on the performance and service life of the blades.However,the traditional methods of detecting twist angles relied heavily on specialized fixtures and measuring tools,which were inflexible,inefficient and inaccurate.To address this issue,a digital flexible detection method for rotor blade twist angles was proposed,and a detec-tion system for rotor blade twist angles was designed and constructed.This system enabled automatic detection of rotor blade twist angles and might greatly improve detection efficiency and accuracy to meet the detection requirements of different types of rotor blades.A twist angle calculation method was proposed based on key section local contour registration.The point clouds on the surfaces of rotor blades were collected by laser scanning sensor,a point cloud registration method was employed by combining coarse registration based on principal component analysis(PCA)algorithm and fine regis-tration based on improved iterative closest point using K-dimension tree(KD-ICP)algorithm to accu-rately and efficiently calculate the twist angle values,which provided a general and effective calcula-tion method for rotor blade twist angle calculation.Finally,experiments were conducted on a certain type of rotor blade as the detection object.The results show that the maximum error of twist angle de-tection is as 54″,and the repeatability accuracy is as 18″,which proves the effectiveness and accuracy of the systems.
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