Abstract
The wheel house front glass of a fore-bridge-ship was broken by the shipping of water in rough sea. This breakage of the front glass is incredible because the front glass was in 20(m) above the water surface. In order to analyze the reason of the accident and to avoid similar problems, we demonstrated a flow mechanism causing the strongly rising water flow to the wheelhouse, and then suggested a formula to estimate the rising flow velocity through water tank experiments (1) (2). In this paper, we study experimentally the characteristics of the crash impact water-pressure by using freely falling water mass, and then analyze the breakage condition of the wheelhouse front glass by comparing the above impact water-pressure with the maximum allowable pressure of the designed front glass. In addition a criterion for the breakage avoidance of a wheelhouse front glass is considered from the height of the shipping water level at the fore end over the bow deck. The results are summarized as follows : (1) The non-dimensional coefficient C_<pi> of the impact water-pressure was about 2.8 in the case of the crash angle φ being φ=90°. (2) The characteristics of C_<pi> for φ was able to describe as sin^<10> φ approximately. (3) The breakage of the front glass may occur under the condition that the shipping water level at the fore end reaches to about 2(m) over the bow deck. (4) The above water level would be a useful information for navigator to avoid the breakage of the front glass, because the information can be recognized easily.
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