Key Technology Research And Application Of Numerical Prototype Based On Virtual Reality

Currently, virtual reality technology has been widely applied in industrial manufacturing, military, digital media and other aspects in foreign countries. Its "visualization" technical features help to make some of the physical properties which human body can not be directly perceived in reality be expressed in a more complete way. The interaction of numerical prototype and real machines based on virtual reality can make virtual objects and real-world physical objects interact directly, realizing remote control through the remote-operation, which increases the visual display effects along with reducing operational costs and improving production efficiency of related fields greatly. However, at home, technology research and application of virtual reality is also still in its early stages. In theory, it is far from forming a mature theory and methodology; while the virtual manufacturing is only focused on product design, rarely in the application. Therefore, the need of further research and exploration is still in urgency.The dissertation conducted some innovative research on product display and functional simulation based on numerical prototype via virtual reality technology, as well as combing with the subprogram of National Science and Technology Support Program(2007BAF09B01)--"Key technique research on large-scale full-face TBM numerical prototype ",named " Key technique research on full-face TBM numerical prototype", Ministry of Education key financing projects (105057) and College doctor disciplines special scientific research foundation project "Coordinating design of numerical machine tool and virtual prototype research under the web "(20060145017), and the virtual manufacturing system of lab in NEU. The dissertation aimed to simplify the large-scale complex mechanism equipment’s demonstration and the design proposal appraisal, and has the help in the advancement digit prototype’s application aspect. The main research content is as follows: (1) Build up application display system of numerical prototype. To Onyx4system as the core, the dissertation established a virtual system for numerical prototype and realized the application display of certain cement balanced full-face TBM, proving the reliability of the system.(2) Realize the TBM motion simulation based on numerical prototype. On the basis of establishing3D model of TBM, the dissertation completed statistic structure transformation of TBM via Deep Exploration; programmed simulation program based on OpenGL Performer; realized the virtual assembly process and motion simulation of TBM, which will support the simplification of large-scale and complicated mechanical equipment display and the appraisal of design.(3) Design an interaction method of human skeleton model, based on the control principle of real machine through digital prototype interaction. The dissertation has realized the motion function of human skeleton model through building up the interactive system, which lies a theoretical foundation for the further study of numerical prototype and virtual prototype interaction.(4) Propose a variable potentiometer active stereo display method helping to reduce the visual integration difficulty. On the basis of stereo display theory and two-center projection algorithm, as well as combined with self-designed ranging interface, the dissertation compiled three-dimensional display program with the use of Performer, VC++and verified the validity of the method.(5) On the basis of building a interaction framework of numerical prototype and real machine via VR, the dissertation designed a mobile platform and manipulator robots, focusing on the analysis of its chassis movement and positioning methods; making further study of the use of servo drives and motion control of manipulator positioning method, realized the steering gear control, and initially verified the feasibility of interactive systems.(6) Achieved interaction system validation of numerical prototype and real machine via VR. The dissertation took the method of Arduino Mega controller, VC++to complete the functional process of experimental robot hardware and software, designed the control end of the experimental system, robot system and the monitoring software modules, and further validate the feasibility of the motion interaction system.