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Buoy is the structure which is floated on
sea surface in order to indicate the presenting obstacle such as reef and
shallow sea and to show the direction of sea route to ship during sailing.
Generally, the conventional material of buoy is steel and it has some problems.
Firstly this steel light buoy has safety risk in case of collision between ship
and steel buoy. Secondly steel buoy revealed high corrosion environment of
salted water and oxide and corrosion of steel can lead to marine pollution.
Thirdly it needs too much maintain cost because of its heavy weight. In this
study, in order to overcome these problems we changed the buoy material from
conventional steel body to polyethylene body. Polymer buoy body was designed
with module type part and it can reduce total weight up to 43.12%. To evaluate
the strength of that part, the structure analysis simulation was carried out
with respect to stress, displacement, and strain. Maximum stress was 1.667 × 107
N/m2 and it was 25% of yielding stress of base material. Maximum displacement
and strain were 3.164 mm and 0.00433353 and they are too small value and in
safe range with comparing to total length of body. The stability of polymer
buoy body was compared with conventional buoy with respect to center of
gravity, center of buoyancy, metacenter, oscillation period, and tilt angle by
wind, tidal current, and wave. Every value was improved comparing conventional
one and we can get more stable buoy. Therefore the new polymer buoy body could
prove its safety and stability.