Flutter detection of composite plate using finite element and eigenvector orientation method

This paper examines the use of eigenvector orientation method to detect the onset of nonlinear supersonic flutter of composite plate modeled by finite elements. The accuracy of the eigenvector orientation method for prediction of the flutter boundary (indicated by a gradual loss of orthogonality between two eigenvectors) is demonstrated by using the example of a simply supported composite plate model at supersonic speed. It is proved that the eigenvector orientation method can avoid the modes coupling and be easily monitored.