Improved mode-superposition technique for modal frequency response analysis of coupled acoustic-structural systems

The modal frequency response (MFR) of a coupled acoustic-structural system is presently obtained via a novel formulation employing a coupled-system orthogonality condition. A compensation technique is proposed for the effects of lower and/or higher modes that lie beyond the frequency domain of an MFR analysis. The application of this technique significantly improves convergence, and makes possible the determination of frequency response with accuracies superior to those of the mode-displacement method and the mode-acceleration method, without increasing computational effort.