3. An Observation of Bottom Impact Phenomena by means of High Speed Video and Transparent Model

概要

論文の詳細を見る
An observation of bottom impact phenomena on a flat bottomed ship has been made by means of high speed video recording system and the transparent model of a tanker. The model was towed in regular waves while making pitching and heaving motions freely. Two video cameras were used in the experiments. One camera was set to take a picture of bottom impact through the transparent hull and the other camera was used to record the impact pressure in an oscilloscope. Both pictures were superimposed for synchronism between the pressure fluctuation and sequence of the events. Three kinds of impact phenomena were observed during the experiments. One was oblique impact, another was trapped air impact and the other one was normal impact. The video shows that high peaked pressure in the wide area appears in the case of trapped air impact while the pressure gauge is in the trapped air and the so called vibration of compressed air follows. The normal impact which is characterized by earlier touching of the forepart of the bottom were examined to show that its high pressure are related to the rapid expansion of the wetted area. Discussions are also made on the possibility of coexistence of trapped air and normal impacts, based on the experimental results. The correspondence of the events to the pressure fluctuation were examined to show that the oblique impact can be explained by the estimation by one of authors. In every cases it is seen that the three-dimensionality plays important role in the bottom impact phenomena.
社団法人日本船舶海洋工学会の論文

3. An Observation of Bottom Impact Phenomena by means of High Speed Video and Transparent Model

スポンサーリンク

概要

著者

関連論文

スポンサーリンク