波浪衝撃荷重と船体の応答に関する実船計測 : 第1報

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Sea trials were conducted featuring measurement of wave impact loads and hull responses for a patrol boat with displacement about 1,300 ton, while the boat was run in severe waves at various kinds of wave encounters and speeds. Measured items are ship motions, Iongitudinal bending stresses on upper deck and impact pressure on the bow flare and at the bottom of fore part of the hull, as well as waves in the test area. This paper presents some results of the analysis of the data, as follows. 1. Bow flare slammings occured so frequently, but bottom slammings did a few times even in head seas. Bow flare slammings induced very high whipping stresses on the deck. but the latter did not. 2. Impact pressure on the bow flare, which was showed to be the main cause of bow flare slammings, were estimated by means of a method which was derived on the analogy between water impact phenomina of a wedge. and that of a ship. The estimated pressure showed very good agreements with the measured one. 3. Numerical analysis of impact pressure on the bow flare by the method showed that ship speed had to be taken account of for the estimation of the impact pressure. 4. According to spectrum analysis of whipping stresses and acceleration, up to 3rd mode of hull vibration is enough to simulate the hull response to slams. 5. Analysis of fundamental mode of whipping vibration showed that logarithmic decrements at the inititial stage of whipping were very large, but those of the following vibration were comparatively small, which were still almost twice as large as Kumai's formula.
社団法人日本船舶海洋工学会の論文

波浪衝撃荷重と船体の応答に関する実船計測 : 第1報

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