The Research Of Virtual Instrument Visual Modeling Method

With our society entering the era of knowledge economy and the rapid development of information technology, instruments and meters are widely used in every field, which makes the instrument industry has been rapid developed. However, traditional instrument in aspects such as sensitivity, accuracy, reproducibility and stability will be affected because of the limitation of production technology. At the same time, the external environment also affects the reliability of the instrument. In order to solve the above problems and meet the higher requirements for measurement and control precision of modern science and technology, virtual instrument arises at the historic moment on the basis of development of computer technology, virtual reality technology and network communication technology, etc. Virtual instrument has got more and more attention and application.This subject completed the design and development the system of virtual instrument development platform. It can make many kinds of virtual instrument be developed conveniently and quickly, and make the people without professional computer skills be able to complete the design of virtual instrument. The characteristics of the system is able to define and design a corresponding virtual instrument according to the actual needs of test tasks. And at the same time, the system can meet the needs of ordinary users. It dose not require the user to have special knowledge of computer.This paper expounds the developing process of the virtual instrument visual design platform system on the basis of the research of modeling methods and computer technology. In this paper, key technology was been introduced firstly such as the visualization and eliminating technology of screen flicker when using VC++ drawing graphics. Then several interactive modeling methods were introduced and compared from the aspects of object-oriented modeling and UML modeling. And next on the basis of the study of the characteristics and constitute of virtual instruments, the instrument unit definition method based on the “unit element” and a modular design approach aiming to assemble and combine the “unit element” was proposed, and their visual model conversion method was described. And finally from the perspective of system implementation, the architecture and implementation process was introduced in detail, and the usability and the accuracy of the system were validated by combining the plane virtual maintenance examples.