Vibration Characteristics Analysis Of Aero-engine Compressor Blade Polishing

Blade is an important part of aero-engine.The performance of aero-engine largely depends on the design and manufacturing level of blade profile.Therefore,the blade is also called "pearl on the crown of industry".As the blade is a typical free-form surface part,the curvature of the polishing surface changes greatly and irregularly,so it is difficult to realize automatic polishing.At present,manual polishing is still the main method.2017,airbus and Boeing 2021 aircraft,and need to assemble a large number of blade,for the research of automatic blade polishing has realistic meaning and value,blade in the polishing process will inevitably produce vibration,the vibration will cause uneven polished surface texture appear even designed in corrugated,studying the characteristics of the vibration of the blade has a promoting effect to the development of automation of polishing.Taking a certain type of compressor blade as the research object,this paper comprehensively carried out blade reverse modeling,blade modal simulation analysis based on Ansys Workbench,blade modal analysis experiment based on hammer hammer method,vibration characteristic analysis of compressor blade polishing process,and optimization of compressor blade polishing process.The main contents are as follows:Based on the theory of reverse engineering and surface reconstruction,3d scanning was carried out on the existing compressor blade,and the point cloud data was obtained by the tianyuan 3d scanner,and the 3d model of the blade was obtained.According to the size comparison and error analysis between the 3d model and the actual model,the obtained 3d model is proved to meet the research requirements.Based on the theory of structural dynamics,the natural frequency and mode of vibration of compressor blade are obtained by modal analysis under the clamping state.The natural frequency and damping ratio of compressor blade were obtained by using LMS vibration test equipment to conduct modal experiment on the blade.The accuracy of the experiment was verified by damping ratio,and the results of finite element modal analysis were verified by comparison with the finite element simulation results.Harmonic response analysis is carried out on the basis of modal analysis to analyze the change of resonance frequency of the blade under the influence of external excitation force and optimize the motor speed.The sand belt polishing system was built,and the vibration characteristics of blade polishing were analyzed by using LMS vibration testing equipment and laser displacement sensor.By changing the clamping force of clamping condition to test the vibration of the blade,it is concluded that 26 N condition best,and optimize the clamping way,contrast change before and after vibration situation,under the different polishing speed,the effect of polishing,use super depth of field of 3 d scanning leaf after polishing and polishing effect,the study found that different regions,different blade polishing the best speed.High-power scanning was performed on different areas of the blade to obtain the surface topography data,and the comparative analysis proved that the optimization method was effective.The cause of vibration in polishing and the solution are put forward.