Augmented Reality Aided Assembly For Cable Connection In Space Launch Test

Cable assembly is an important link in the comprehensive testing of space launch vehicle control systems.Currently,the task of cable assembly in the comprehensive testing mainly relies on paper process documents.The management and query of process information are relatively complex,and the operator’s assembly process is inconsistent.The textual description of the assembly process also brings cognitive burden to the operator.After the cable assembly is completed,it is necessary to inspect its assembly quality and take photos for archiving.Operators are prone to misinspection after conducting a large number of quality inspections.Due to the above reasons,the efficiency of cable connection is relatively low and quality control is difficult,resulting in a long cycle of comprehensive testing of the control system.Cable assembly has become a negative factor that restricts the conduct of the test.Therefore,the efficiency,accuracy,and reliability of cable assembly are extremely important.In order to solve the above problems,this article proposes an augmented reality assembly method for cable connections in space launch experiments.The main research work and innovative points are as follows:(1)Constructed an augmented reality model for cable assembly assistance.Firstly,a cable assembly assistance architecture based on augmented reality is proposed,which describes the various stages of cable augmented reality assisted assembly;Secondly,a process information model for cable enhanced assembly was established to describe and manage the process information included in the cable assembly process planning process.(2)A scene aware AR assisted assembly method(ISAR)is proposed to address the issues of frequent interaction and weak scene perception in augmented reality applications.Firstly,a point cloud segmentation process for assembly object instances was designed;Secondly,the nearest point iterative algorithm is used to estimate the pose of the assembly object,and the pose confirmation of the assembly object is completed by combining relevant parameters;By evaluating the average running time of the algorithm and the assembly time of different assembly methods,it is confirmed that ISAR can perceive the assembly process,display relevant process information and auxiliary guidance information,and reduce user interaction.(3)A cable enhancement assisted assembly method that integrates machine vision detection is proposed to address the issues of low quality inspection efficiency and separation between inspection and assembly processes in cable assembly.Firstly,the reliability testing of cable assembly was implemented based on YOLOv7;Secondly,combining DBNet with CRNN to achieve accuracy detection of cable assembly;By integrating algorithms into Holo Lens to assist operators in detecting the quality of cable assembly,a closed-loop control of the cable assembly process has been achieved.(4)Finally,an enhanced assembly guidance system based on Holo Lens was built using a server client model.Taking a complex cable assembly process in aerospace as a case study,the results show that the system reduces interaction processes,improves assembly reliability,and achieves efficient guidance for cable assembly.