3D Image Reconstruction Technology And Realization Of Aircraft Pipe Structure

Aircraft pipe is an important part of the engine.In order to make full use of the space of engine,the pipe must be bent into various shapes to avoid mutual interference in the limited space.The aircraft pipe is slender and soft,which are easy to bend and deform.Its processing and manufacturing technology are very complex.Due to the complex influence factors in the process of bending aircraft pipe,the bending quality of pipe is hard to control.At the same time,there are many types of aircraft engines.Many foreign aircraft engines have no design drawings and spare parts,which cause the difficulties in catheter maintenance.In engineering practice,digital measurement is usually carried out after aircraft pipe bending,which is the most effective and direct method to control the quality of pipe manufacturing.With the continuous iteration of the engine system of aircraft,the shape of pipe becomes more and more complex,and the requirement of the accuracy of pipe is more stringent.And the traditional measurement methods have been difficult to meet the actual target requirements.In this paper,a multi-vision visual 3D measurement method is studied to solve the inefficiency of traditional manual measurement.In this paper,a multi-vision visual 3D reconstruction measurement method is studied for the problem of low manual measurement efficiency of traditional aircraft pipe related data in aerospace manufacturing field.Based on this,a related software control system is designed.The experimental results show that the method is effective and the measurement accuracy is 0.5mm.In this paper,aiming at the low efficiency of manual measurement of aircraft catheter in the field of aviation manufacturing,a method of multi-vision 3D digital measurement is studied,and the corresponding software system is developed on this basis.The main research work of this paper is as follows:(1)This paper analyzes the importance of machine vision 3D reconstruction measurement method in practical engineering,introduces domestic and foreign research results and methods of digital measurement technology and 3D reconstruction technology,and points out the shortcomings of current research methods in this field.Research significance and main work of the thesis.(2)Introduced the basic theoretical principles of the binocular vision measurement system with 3D reconstruction.Based on this,a multi-vision measurement system has been proposed.The calibration principle and method of the binocular system is analyzed.Finally,the key implementation technology and overall technical route of 3D digital measurement system are presented.(3)The influencing factors of catheter image preprocessing were analyzed,and an adaptive illumination correction algorithm was adopted to remove the highlight reflection on the aircraft pipe surface which combine the illumination principle and method in the pipe measurement system.This image preprocessing method improve the quality of pipe reconstruction.(4)The characteristics of the pipe were analyzed,and an algorithm for centerline reconstruction of the pipe based on multi-vision was studied.According to the 3D model of the pipe,the least square method was used to fit the position of key points.Using coordinate transformation to realize the actual parameter calculation of the pipe.(5)According to the algorithm principle studied in this paper,an intelligent pipe measurement system is designed and developed.The effectiveness of the method is verified by experiments and the measurement results are analyzed.(6)Summarize the research of this paper,and prospect the related work and development.