Flutter Condition Estimation for 3-D Cantilever Plate Using Fully Coupled Fluid – Structure Interaction


The aeroelastic responses and the flutter condition of 3-D flexible cantilever plate were estimated by developed fully coupled fluid-structure interaction(FSI) approach. The plate model (structure model) based on assumed mode method was then combined with unsteady panel-discrete vortex method (aerodynamic model) to build relatively simple aeroelastic model. The validity of the present method had tested through comparisons with the related published work of plates flutter prediction and with wind tunnel measurements. Time domain simulation is used to examine the dynamic aeroelastic instabilities of the system. The flutter occurrence is verified when the responses diverge. To estimate the flutter frequency, Fast Fourier Transformation (FFT) technique is used to convert the generalized coordinates responses from time domain to frequency domain. The flutter speed and flutter frequency is found for many Aluminum cantilever plates which are different in aspect ratio. The speed and frequency of the flutter are within average absolute error of about 13% and 16 % for theoretical analysis and practically respectively.