Abstract: This paper briefly introduces "A Real-Time Flutter Analysis System" which is an integrated software combining theory with experiment. The two ways of using ground vibration test results of an aircraft to perform the flutter analysis in the system are described. One is directly using the modal test data. The mode vectors, if necessary, can be pre-processed by an orthogonalizing approach. The other is using a dynamic mathematical model of the aircraft modified from the modal test data. Additionally, a modification procedure for local sub-structures of the aircraft by using an inverse method of Branch Mode Synthesis developed by the authors is also presented.

Key words: flutter analysis, integration of test and analysis, modification of dynamic model