Study Of Structure Experiment Modal Analysis Based On Virtual Instrument Technology

As an embranchment of virtual technologies, virtual instrument technology is becoming a hot issue in recent years. It resorts to the advantages of computer such as saving, processing, analyzing and computer software such as easy upgrading, easy modifying, high flexibility etc, which impacts on traditional measure and control instruments. So this article studies the relevant theories and knowledge of experiment modal analysis (EMA) and computer software, points out some deficiencies of present modal analysis technologies in our country. According to the idea of virtual instrument, mechanical structure EMA system based on virtual instrument technology is developed in this paper, which is based on combining Visual C++ 6.0 as software workbench with MATLAB 7.1 as data analysis instrument , OpenGL industrial standard used in 3D model input and output, and essential sensor, signal conditioner and data acquisition card (USB2015). On this base, the functions such as structure input, data collection, spectrum analysis, parameter identification and vibration shapes output are completed.