Virtual EMA instrument based on graphic cell objectΔ

Using object oriented programming for reference, a graphic cell object oriented method of 3D structures input and output is proposed. Virtual experimental modal analysis I/O reference model based on OpenGL graphic industry standard is founded. Applying the technologies of MFC and OpenGL to realize 3D structure input, display, dynamic output and the software interface of adding graphic cell, the I/O of 3D structure is simplified to the ones of graphic cells. Using the technologies of blending, hiding and lighting in OpenGL, the modal vibration shapes are processed. All of these not only offer the conveniences for input process of tested structure, but also advantage the modal vibration shapes' observation of structure parts. As an application, using the technologies of virtual instrument and virtual controls, a virtual experimental modal analysis instrument is developed, which has the characters of low cost and high precision. The instrument can not only be suitable to be used in experimental modal analysis of mechanical engineering structures, but also be applied in the front and back process modules' of finite element analysis.