Research On Interactive Virtual Assembly Technology Of Gearbox

With the development of industrial production towards automation and digitalization,virtual assembly is bound to become an important research and application direction in the industrial production digital design and manufacturing.Research on virtual assembly not only embodies the combination manufacturing and computer technology perfectly,but also changes the traditional way of assembly,so that assembly problems can be found in advance and assembly performance can be tested and evaluated,reducing the assembly cost and assembly cycle,which has important technical value and economic benefits for the development of the manufacturing industry.Therefore,to choose a suitable and efficient research method and theory to improve the efficiency of the virtual assembly is a problem to be solved.In the paper,set the gearbox as an example,the researches on four aspects are completed,including assembly sequence planning,assembly path planning,collision detection and virtual assembly system.Firstly,establish solid modeling of gearbox by Solidworks software;select the Imperialist Competition Algorithm for assembly sequence planning,obtaining the matrix expressing assembly relationship by graph method aiming at the application shortcomings in assembly sequence planning,establishing the target evaluation function.Combine the idea of hierarchical assembly with it and integrate differential evolution into it,improving greatly the convergence efficiency and optimization accuracy.By Matlab programming,verify the feasibility and the superiority of the improved algorithm,providing a theoretical basis for the subsequent assembly path planning.Secondly,based on the traditional RRT algorithm,use R function to adjust RRT search steps.According to the RRT algorithm's inadaptability,put forward to using sphere method to generate random nodes and precisely searching assembly path by assembly guidance and constraint.Facing to the problem of low efficiency of the traditional pose transformation method,put Quaternions method to the assembly path planning.By Matlab programming,assembly path planning of gearbox is simulated,simulation of gearbox assembly sequence planning based on good,proving the effectiveness of the improved RRT algorithm,providing a solid theoretical foundation for the follow-up of virtual assembly.Again,select hierarchical bounding box method to detect collision based on interference detection idea and detection ways.Select triangle mesh bounding box through analysis and comparison of three kinds of bounding box on construction time,intersection test time,update time and tightness by cost function.Design the collision detection range and response mode in Script node programing module based on the powerful detection function of CollisionObject in Eon and collision detection process is simulated combing with the virtual hand,founding the theoretical guidance for subsequent research on virtual assembly.Finally,combining Eon Studio software with Script function,VB programming language,orientation tracker and data gloves,based on information interaction principle between ActiveX control and EonX,visual virtual assembly process comes true by VB programing,and establish complete virtual assembly system.Through the platform,virtual assembly can not only reduce assembly time,but also save assembly costs,improve assembly quality,providing powerful guidance for digital design and manufacture.