Research Of The Aero Engine Blade Cross-sectional Feature Parameters Extraction

In recent years, as the perpetual development and improvement of the Aviationindustry, the inspection of the aero engine blade gradually becomes a hotspot issues.As the blade profile is complex, the number of the blade is large, the blade is serioustwist, it’s very hard to inspect the blade profile. Furthermore, the work environment ofthe blade is very serious, it needs to bear the high temperature and high pressure. Soit’s very important to ensure the blade quality. And every year, among the aeroaccidents, the blade occupies a big part.For the inspection of the blade, it contains every profile parameters, such as theleading and trailing edge, the chord length, the max thickness and so on. Based on thiscase, this paper talks about the algorithm of every parameters, and have experimentalverifications to prove the algorithm. The following work has been done in this paper:1. Acquisition methods of measuring point in blade surface detection.This paper researches the extraction of the blade section parameters: using UGmodeling software to establish three-dimensional model of the engine blade, on thebase of the model, using the convenient secondary development tool of UG, acquiringmeasurement points of the blade model for parameter extraction.2. Research on the corresponding extraction algorithm of each blade sectionparameter and the algorithm realization.First, based on the definition and graphic of each section parameter according tothe Chinese aviation industry standard, we introduce the method of acquiringmeasurement data using the blade UG model, next introduces every parameterextraction algorithms, including the center and the radius of the leading and trailingedge, the thickness of the leading and trailing edge, the thickness of maximum bladeprofile, the chord angle and chord length3. The precision validation of blade section parameter extraction algorithm.Based on the extraction method of the various parameters and theory of acquiringmeasurement points discussing in the third chapter, realizes data acquisition andparameter extraction through UG, MATLAB and other software, and introduces theusage of UG secondary development language Open Grip in the acquisition process ofmeasurement points, verifying the accuracy of the algorithm according to the error between the theoretical results and the calculated results of the extraction data of twocross section, with an evaluation and analysis of the accuracy, and displaying thegraph of blade measurement data.