Study Of The Key Technologies Of Control And Interaction In Virtual Assembly

In the field of mechanical assembly, virtual assembly technology which has many features including high efficiency, environmental protection and low cost is realized by the application of virtual reality technology. The operator can be immersed in the virtual space and can inspect the structure, appearance and assembly feasibility of the product. By using this method, designers can immediately find the designing problem of the product, can improve the quality of the product and can reduce the cost of the product’s manufacture. However, for the kind of virtual assembly system, there are a lot of problems including inconvenient usage and unnatural interaction. Because the interaction way in these systems is not natural, direct and convenient. And these problems have affected the operating experience for the system’s users. This paper studies the key technologies of control and interaction in virtual assembly which include the shader, bounding box collision detection and gesture recognition, and verifies the designing feasibility of virtual assembly system in this topic by the example of a virtual reducer assembly experiment.By using multi-channel stereo projection technology, somatosensory interaction technology and virtual reality technology, this paper designs and realizes a large immersive virtual assembly system which has teaching, research, demonstration and report functions. First of all, the overall development plan of the virtual assembly platform is determined, the hardware platform of the system is constructed and the virtual reality development engine of Unity3 d is selected to develop the system’s software. Secondly, in the aspect of system’s immersion, using the shader technology controls the vertex and pixel training processes of GPU to enhance the quality and effect of the image and to provide a strong sense of visual immersion for the operator; in the aspect of system’s real-time, using the bounding box collision detection technology solves the penetrating phenomenon between the product’s models and using an approximate model’s collider replaces the collider of original model to reduce the consumption of the system resources and to improve the real-time response speed of the system; in the aspect of system’s interaction, the operators can directly use their hands without any other somatosensory devices to interact with the virtual objects by using the optical solution of Leap Motion, and using the device’s function of gesture recognition controls the assembly process to provide a natural, direct and convenient interaction way for the virtual assembly system. Thirdly, through the design of the framework, structure and function of the virtual assembly system, the software which has many functions including login check, reloading scene and 3D UI interaction is realized by Unity3 d and release on the platform of Windows. At last, there is a virtual reducer assembly experiment running on the virtual assembly platform and testing the virtual assembly system, which is a case to demonstrate the feasibility of the design of the virtual assembly system.The results of this paper have a certain reference value for other fields which include the applications in mechanical engineering, the simulation of industrial automation production line and the technology of virtual manufacturing.