The Research Of Semi-physical Virtual Model Technology

In the latest years with the technology of Virtual Reality developing rapidly, all related fields, such as manufacturing industry controlling industry and so on, achieve much progress. This paper combines VR technology with the research and development of simulation. In order to supply data for later system, a system platform that can simulate testing spot can be built up in the lab condition. Therefore this not only can improve design efficiency, but also shorten design period and decrease the risk of failure. Semi-physical virtual model system extracts transfer functions from practical system as the basis for model-building. Through operation and simulation, the output signal as actual as possible can be achieved.Firstly this paper introduces the development of related VR technology and semi-physical simulation technology, then discusses the principle of simulation from the angel of modeling and analyzes the feasibility of virtual model system. Secondly the paper introduces data-acquisition module made up of data-acquisition card and interface circuit to realize input and output in real time in the hardware. Later several key methods are emphatically pointed out: the Object-Oriented method and the inheritance thinking of object are employed to gain visibility and build-up repeatedly of model component in model library; the technology of double-buffer and multi-thread assure the capability to manage in real time of multi-task system; the algorithmic design of data-flow solves the problem of simulation calculation, and lay a basis of system expanding for the future. Then the paper verifies the system with examples and provides the performance.At last it summarizes the research achievement of this paper and raises a new hypothesis for semi-physical virtual model system.