Research On Intelligent Laser 3D Projection System And Calibration Technique For Spatial Positioning Accuracy

With the rapid development of "Industrial Internet","Industry 4.0","Advanced Manufacturing Partner Program" and "Made in China 2025",the high-end equipment manufacturing industry is developing rapidly toward globalization,informationization,specialization,environmental protection,and service.In the face of the long manufacturing cycle of its products,the quality and efficiency that are not easy to manage and control and frequent changes in the work object,it's required to manually participate in high flexibility,small batch,and customized assembly production process.Intelligent laser 3D projection technology can be used to guide the automatic lofting,guide the precise positioning of components,support position tolerance rapid inspection,measure data error visualization and verify virtual assembly on-site,to help guide workers to complete the relevant assembly work and testing.In this paper,an intelligent laser 3D projection system is set up,and the uncertainty of the system is analyzed,and the relevant experimental verification is carried out to realize the visual evaluation of the system.The main work done in the thesis is as follows:1)Study the working principle of smart laser 3D projection system.Establish laser 3D projection positioning model,laser tracking and positioning model and intelligent laser 3D projection positioning model,and provide a theoretical basis for building intelligent laser 3D projection system.2)Construct the theoretical method of intelligent laser 3D projection system.Establish a three-coordinate observation model of the intelligent laser 3D projection system,and the observed values of the system were solved based on the Newton iteration Breed Particle Swarm Optimization algorithm respectively.Build the calibration model of the optical center of an intelligent laser 3D projection system.The system calibration parameters are solved by Quaternion method,Lodrigues Matrix method,and Singular Value Decomposition respectively.The error evaluation model is constructed to evaluate the system calibration and projection accuracy.The simulation model of the observed value and the calibration model are simulated.The results show that Breed Particle Swarm Optimization algorithm together with the quaternion method to solve the calibration parameters,which is an order of magnitude higher than the Newton iteration method combined with the quaternion method to solve the calibration parameters.It provides a theoretical basis for 1: 1 high-precision projection of an intelligent laser 3D projection system.3)Establish the optical center parameters automatic calibration technology.To avoid the gross error and reduce the random error,the multi-station data collection is adopted,and the measurement data is adjusted and merged.Optimize the optical center parameters,and merge the system observation model,the optical center parameters calibration model and calibration error evaluation model and multi-station adjustment technology into the calibration software,to make the calibration of smart laser 3D projection systems automatization and standardization.4)Propose the projection space positioning accuracy and network layout optimization techniques based on the uncertain model.In-depth study intelligent laser 3D projection space positioning accuracy,the formation of intelligent laser 3D projection system uncertainty model,the establishment of intelligent laser 3D projection network layout and optimization methods,analysis of all the projection site uncertainty,the formation of three-dimensional color picture of uncertainty distribution,to provide the theoretical basis for the visualization of smart laser 3D projection system.5)Set up a projection positioning visualization pre-assessment system.Based on the uncertainty model,the intelligent laser 3D projection space location accuracy assessment method and measurement network layout optimization techniques are presented to realize the projection system reachability analysis and the visual evaluation of the accuracy.Taking the projection and assembly of the parts on the curved surface as an example,the system is initialized and configured according to the existing projection positioning assembly scheme,and the reachability analysis and visual evaluation of the projection positioning assembly system are carried out.Based on the evaluation results,the layout optimization is carried out to improve the overall positioning accuracy of the system and establish a reliable pre-assessment method for intelligent assembly.6)Set up a smart laser 3D projection system and carried out the overall design.Based on theoretical design or actual reverse three-dimensional model,from precise digital measurement,the position projection in three-dimensional space is accomplished by laser projection.When the projection system or the measured components move or drift,the intelligent recognition,solution,compensation for the relative displacement,to ensure accurate real-time projection to the correct location,and orderly guide manual operation.The experiments of light width,positioning accuracy,shape accuracy and position compensation accuracy were carried out.The working accuracy of the system was calibrated and evaluated.The system positioning accuracy was better than 0.3mm.It achieved real-time tracking,adaptive compensation,high-precision positioning,automatic calibration,visualization,intelligent assessment and other functions.