Design And Implementation Of Digital Detection System For Aircraft Assembly

In order to adapt to the rapid development of aviation manufacturing technology,the development of aircraft digital assembly and aircraft digital detection technology is more and more rapid.Manual operation can no longer meet the needs of aircraft assembly,and manual detection methods can no longer meet the increasing requirements of users for aircraft quality.There is an urgent need to study digital and intelligent detection methods.At the same time,advanced manufacturing technology and detection technology can not be achieved overnight.We need to step by step down,concentrate on basic technology,and bring qualitative leaps through continuous quantitative changes.The purpose of this project is to change the existing two-dimensional qualitative measurement mode of aircraft assembly,establish a three-dimensional digital detection system initially,and lay a theoretical foundation for the research and application of digital and intelligent detection system.In this paper,the design and development of digital inspection system for aircraft assembly is completed by using the measurement algorithm and SDK secondary development function of Spatial Analyzer measurement software.The system realizes the functions of inspection path planning,visual navigation and automatic report generation.In order to ensure the realization of the function of the digital measurement system,the principle of the digital space measurement equipment and the processing method of the measurement data are studied firstly.The calculation of the hole center position is realized by using the projection method of the center of the circle,which solves the problem that the measuring equipment such as Laser Tracker System and Light Pen Measuring Instrument from Metrono can not directly measure the coordinates of the hole center position.At the same time,based on the status of equipment,the requirement of building station for measuring nodes involved in assembly process is studied and defined,and the method of establishing reference coordinate system before,on and under the frame is determined.In order to solve the problems of many measurement data and complex measurement position in the measurement process,the measurement planning function is designed.Through the input of basic information,the system automatically generates the measurement navigation interface: 1)defining the current measurement tasks;2)reminding the connection of measurement equipment;3)guiding the establishment of coordinate system;4)guiding the implementation of measurement tasks;5)prompting the disconnection of equipment;6)reminding the generation of measurement Presentation.In order to solve the problem of frequently calling each module but inconsistent function parameters when SA measurement software is executed,the system uses Excel table to store the measurement task step parameter function,stores the front-end display information of each step and the back-end data calculation parameters needed to be applied together in the excel table of the local task folder,and reads the relevant parameters directly when the system runs.To carry out the implementation to ensure the efficiency of the system.In order to solve the problem of measuring the same information for different sorties of products,the task management module is designed.Different task folders are established by the task name locally,and information such as measurement step parameter files and measurement reports are stored.It is convenient for users to call measurement planning repeatedly and view reports,thus realizing the digitization of measurement results.Through the design and application of the digital inspection system for aircraft assembly,the measurement of single frame and under-frame system components is realized.The problems on the spot were found and put forward in time,which solved the problems of inaccurate manual inspection and difficult statistical results for a long time,and provided strong support for the improvement of aircraft assembly quality.