Wave responses of a coastal cargo ship consisting of unit modules |
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Authors: | Budi S Prasodjo Kimio Saito Yasushi Higo Hisashi Nobukawa Katsuya Maeda |
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Institution: | (1) Graduate School for IDEC, Hiroshima University, 1-5-1 Kagamiyama, Higashi-Hiroshima 739-8529, Japan;(2) Hiroshima University, Hiroshima, Japan;(3) National Maritime Research Institute (NMRI), Tokyo, Japan |
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Abstract: | This article discusses the dynamic responses of a coastal cargo ship that consists of unit modules with advance forward speed
in waves. We introduce a simple way of connecting the modules that has enough capability to link the modular parts of the
ship as a unified whole. The flexible connection consists of male and female rubber fenders with additional pretensioned ropes.
This kind of connection system is proposed for use in coastal regions with relatively calm waters wherein the modular ship
can move at a moderate speed. The modules are assumed to be rigid compared to the connections. Computations were performed
to investigate the vertical elastic responses of four modules connected end-to-end with the assumption that in the simple
hinge, no gaps occur in the flexible rubber connections between adjacent modules. A simple method, which is an extension of
the computational analysis we reported previously, is presented to study the hydroelasticity and rope tension forces of the
modular ship with forward speed in waves. Experiments with a three-dimensional model at Froude numbers of 0 and 0.16 in head
waves were performed to evaluate the effectiveness of the calculation method. In the experiments, deflections for each part
were measured using calibrated potentiometers. Force transducers were used to measure the rope tension force between the modules
of the articulated cargo ship. Some slight differences were observed, but generally the calculated results showed the same
trends as the experimental values. |
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Keywords: | Elastic responses Deflection Rope tension force Coastal cargo ship Flexible joints |
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