A design for ship stabilization by activated antiroll tanks |
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Authors: | Wen-Jeng Hsueh Ya-Jung Lee |
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Institution: | (1) Department of Naval Architecture and Ocean Engineering, National Taiwan Unviersity, 73 Chow-Shan Rd., Taipei, Taiwan, ROC |
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Abstract: | An activated antiroll tank system design for ship roll reduction was investigated. Considering the dynamics of the ship motion,
tank flow, and variable-pitch impeller, a control law is derived based on optimal control and estimation theory. Finally,
a series of numerical computations for a 1174 tonne ship without an antiroll tank system, with a passive tank system, and
with the proposed activated antiroll tank system is performed. The results show that the proposed activated tank system has
superior antiroll properties for free rolling, regular, and irregular sea loads to the passive tank system. In addition, this
design has a very low sensitivity to variations in ship and tank dynamics. It shows that the proposed system is reliable and
valid for practical use. |
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Keywords: | activated antiroll tanks roll stabilization system optimal control |
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