STUDY ON VIBRATION OF ROTATING SHELLS SUBMERGED IN WATER BY FINITE STRIP-BOUNDARY ELEMENT METHOD

A method is presented for the coupled vibration analysis of rotating shells submerged in liquid. In order to improve computing efficiency, the finite strip (FS) technique is used to analyze the rotating shell. As for the liquid area, a special boundary element (BE) is proposed. Compared to classical BEM, this BE not only guarantees the continuity condition on the liquid-shell interaction plane, but also has less unknowns. By combining the shell governing equations for shell and liquid and using the continuity conditions, the shell-liquid system抯 governing equations are further simplified. The method has been applied to a typical segmented shell-liquid system, and the natural frequencies, mode shapes and response of vibration are calculated numerically. It is shown that the method of this paper has good efficiency and precision in computing, and can cope with arbitrary rotating shell-liquid system easily.