Ring mode is considered to be correlated with the acoustic level inside a fairing of a launch vehicle. The ring mode of a simplified rocket fairing model with the ring frequency of 10.2 kHz is investigated by both of the modal analysis based on the Finite Element Method (FEM) and experimental modal analysis. The resolved frequency range in this study is set to 20 kHz. Through the experimental modal analysis, the modal damping is found to be approximately 0.05 % which is given to the Finite Element Method. Seven ring modes are clearly obtained both in the numerical and experimental results. Although the deviation of the frequency is observed about 60 to 300 Hz, reasonably agreement is obtained on the modal shapes.
