Virtual Aassembly System Research And Development Of The Vehicle Door Based On OSG

Vehicle door is a complex and key part in vehicle body design process and the manufacture craft of vehicle door is strict as the accessory of vehicle door need stamping and welding technology,Virtual assembly is a key research branch in virtual manufacturer area and it is also a combined product of virtual reality technology and digital design manufacturer technology.The design and assembly of products can be realized by 3 dimensional simulation technology,which can solve the problems that may occur in the later assembly process at the design period.Also,the use of 3 dimensional simulation can guarantee the assembly ability of products and improve assembly efficiency,which will save assembly time and assembly cost.Based on the study of the multilevel relevant digraph assembly model which combined with the characteristics of the vehicle door and the product structure digraph model,the real-time crash detection algorithm of the assembly model and the assembly order plan algorithm are developed in this study.The paper sets up the OGS open source virtual reality engine and develops a vehicle door virtual assembly system using the Visual C ++ language.The main contents of this paper are as follow:Firstly,the image rendering engine OSG and 3dmax are integrate to develop a practical door accessory motion simulation module.Combined OSG virtual browsing with 3Dmax animation techniques,in this paper,motion simulation animation of door locks,limiters and hinges are created through 3dmax,and achieves the door virtual assembly system motion simulating by the middle format file to check the function of the door accessories and movement interference.Secondly,through the analysis of the advantages and disadvantages of the assembly modeling method,the multilevel relevant digraph assembly model and the product structure digraph model are combined to establish the assembly modeling method which is in accord with the characteristics of the door structure.The subordinate information of the product and the level relationship of assembly are respectively described in detail by the multilevel relevant digraph assembly model and the product structure digraph model.Meanwhile,the real-time crash detection algorithm of the model in the virtual assembly system is realized by combining the physical engine ODE(open dynamics engine)and OSG(open scene graph).In this paper,removing the sub-node mode is used to optimize the algorithm and reduce memory footprint to improve the speed of crash detection.Finally,the vehicle door assembly order plan is put forward.By establishing the stratified algorithm of the multilevel relevant digraph traversal search,and obtaining the characteristics of each part by traversing and cycling,the plan of multilevel classification of assembly model is completed.The method of man-machine interactive disassembly is used to solve and optimize the assembly sequence of the door.At the same time,in this paper,explosion figure generation algorithm based on the disassembly sequence is proposed,and the explosive displacement of the part is calculated accurately by using the AABB part bounding box.