Low vibration ships have been an important goal in ship design. Mitsubishi Heavy Industries, Ltd., has developed coupled vibration analysis with detail vibrational characteristics of hull structure and main engine and shafting to reduce ship vibration. The analysis has been applied to new double-hull VLCC in addition to previous methods in which the hull structure was the focus. Dominant factors of excitation and its transmission have been clarified by the analysis, and effective measures to reduce such excitation have been determined. Consequently, ship vibration is much lower than in previous ships and propriety of the analysis has been confirmed.
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