Research And Development On Compressor Oriented Modal Analysis System

With the development of the modern engineering technology and computer technology, vibration testing and modal analysis techniques are more and more used in aerospace, automobile manufacturing, CNC machining, large-scale power generation equipment, civil engineering and other fields.Based on in-depth studying the basic principles of the modal analysis and analyzing the situation of foreign research and development of modal analysis software. Using object oriented development tool Visual C++ 6.0 and OpenGL libraries in Windows systems, complete the design and development of the geometric modeling module of experimental modal analysis software system. At the same time, base on measuring the structure's hammer excitation signal and vibration response signal to obtain system's transfer function. Application of orthogonal polynomial curve fitting based on frequency-domain transfer function to identify the modal parameters, including the system's natural frequency, damping ratio and mode shape. And displaying the structure's mode shape using three-dimensional animated by OpenGL technology.This paper designed and implemented a multi-point input and single output simply supported beam experiment. This experiment has been done by using this system and compared the results with the theoretical solution, which showed that the modal analysis software was correctness and reliability. Meanwhile, an actual measurement of compressor experimental modal analysis has been done to identify its natural frequency, damping ratio and mode shape, which validated that the development of modal analysis software has high value of engineering application.