Calculation of coupled modes of fluid-structure systems by pseudo symmetric subspace iteration method

An effcient technique is proposed for calculation of coupled modes of fluidstructure interaction systems. The algorithm was developed with the symmetric matrix operation mentality such that apparently a symmetric eigen-problem was being solved. It was proven that each left eigen-vector was related to the corresponding right eigen-vector through a simple relation. Therefore, the subsequent transient analysis could readily be performed. Overall, the method seemed very effcient and was ideal to employ in generalpurpose nite element programs for solving the above-mentioned eigen-problems.