||Randolph Pauling, William Vorus
||Society of Naval Architects and Marine Engineers
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Much was accomplished in the 1970s and 1980s in improving the technology for designing ships for avoidance of excessive vibration. Because of this, as well as because of the downturn in ship production in the West, research and development in ship vibration experienced hiatus in the 1990s. It will therefore be seen that many of the reference sources cited in the previous edition of this chapter are retained in this edition. This is partially a natural consequence of fundamentally important basic material that serves as building blocks and never changes. New material is inserted where appropriate, but engineering technology that matured in the late 1980s is still mostly very representative of the state-of-the-art of ship vibration. An example of the capability for achievement of vibration control that emerged from the 1980s was the success of the European cruise ship development programs of the 1990s. Vibration avoidance is a crucial issue with cruise ships laden with sensitive customers. The success wras achieved via innovation gained by placing engine rooms out of the immediate stern region to improve stern lines for lowr wake gradients, and employing electric drive with the electric motors in articulating podded-propulsors, thereby avoiding the wake of shaft and bearing "shadows" shed into the propeller disk from forward...