Motion Simulation And Virtual Disassembly System Design Of Automobile Rear Axle In Augmented Reality Environment

Automobile rear axle is an important part of automobile transmission system.It is necessary to help the trainers understand the basic movement principle of rear axle,and carry out training for rear axle disassembly in the training of rear axle product design and maintenance personnel.Traditional training methods are limited by the site and equipment,and the training process will also lead to the loss of equipment and the increase of maintenance costs.Therefore,based on HoloLens equipment and using Unity3 D as the 3D engine,this paper establishes an automobile rear axle motion simulation and virtual disassembly system in augmented reality environment.The system can help trainees intuitively understand the movement principle of the rear axle and grasp the basic disassembly process of the rear axle in the augmented reality environment.In order to complete the design of virtual simulation system,the following research is carried out:Firstly,according to the basic functional requirements of the rear axle virtual simulation system,the system design flow using UG,3DMAX,Unity3 D and HoloLens as development tools is determined.And the overall framework of the system including the main functional modules of the motion simulation system and virtual disassembly system is given.Then,in the design of the system,the key technologies involved in the system are studied,including human-computer interaction technology and virtual-real combination technology.The function of HoloLens device is invoked by C# programming.On the basis of gaze ray collision detection,a human-computer interaction mechanism combining gesture interaction and speech recognition is established.The combination of virtual and real is realized by combining the spatial mapping technology of HoloLens device with the 3D registration technology based on the marker.The Vuforia development tool is used to complete the identification of the marker.Finally,the accurate display of the rear axle virtual model on the real bench is realized.Secondly,based on the preprocessing of the rear axle virtual model,the motion simulation system and virtual disassembly system are established by Unity3 D.The process of virtual model processing: building the 3D model of the rear axle in UG,optimizing the model in 3DMAX to improve the fluency of the simulation system,rendering the model in Unity3 D to make the appearance of the virtual model close to the real object.The establishment of rear axle virtual simulation system mainly includes the design of human-machine interface,collision detection between parts and the motion control of parts.In the design of the system,a motion simulation system is established on the basis of the analysis of the motion principle of the rear axle to realize the rear axle motion simulation under different driving conditions.And a virtual disassembly system is established on the basis of the design of the disassembly process of the rear axle to realize the rear axle parts display,the rear axle automatic disassembly and manual disassembly.Finally,running the simulation system in HoloLens equipment.The simulation results show that the system runs smoothly and has good immersion.The system can display the rear axle virtual model on the real bench,and the human-computer interaction mode is fast and effective.The system can simulate the movement of the rear axle when the car is traveling in straight and curved directions,and complete the virtual disassembly of the rear axle by manual and automatic means.The interference detection between the rear axle components can be carried out effectively.