Fundamental Study of Wave Impact Loads on a Ship Bow (2nd Report) : Equivalent Static Pressure of Impact to Structural Response of a Rectangular Plate Panel

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概要

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• The bow impact pressure and its structural response have so far been studied mainly by drop test of three dimensional bow model. In the previous report, authors discussed the characteristics of maximum impact (peak) pressure obtained from drop tests under various impact conditions which were determined by three principal parameters dictating the bow impact pressure. In this second report, the authors deal with the structural response of a rectangular plate panel in the bow model for impact pressure. Drop tests were conducted with five modesl and, as the magnitude of the impact pressure equivalent to the panel structural response, the "equivalent static pressure P_<eq>" was used, since the measured "maximum impact pressure P_<max>" did not contribute to structural response of the panel as uniformly distributed pressure. The equivalent static pressure P_<eq>, which is converted from maximum transient strain of the panel into uniformly distributed static pressure, includes the dynamic response to impact pressure. In the severest condition of impact (relative angle α of 0 deg.), the magnitude of P_<eq> for the typical, flexible panel of the ship bow is of the order of one third of P_<max>, and about 20% higher than that for comparatively rigid panel (three times as thick as the flexible panel). The relathionship between relative angle α and P_<eq> for a panel located at the center of the model was established. Furthermore, aplied to semi-cylindrical body with relative angle of 0 deg. combining the characteristics of P_<max> obtained by experiment and the Wagner's hydrodynamic pressure, the quasi-static response of a rectangular plate panel to calculated impact pressure was analyzed, for comparison with experimental results. It was found that such numerical analysis would be useful in estimating the approximate magnitude of equivalent static pressure P_<eq>. The results of such numerical analysis showed that P_<eq> was affected considerably by an area of a panel and its position.

• 社団法人日本船舶海洋工学会の論文

著者

• 萩原 孝一

  Nagasaki Technical Institute, Mitsubishi Heavy Industries, Ltd

• Hagiwara Koichi

  Nagasaki Technical Institute Mitsubishi Heavy Industries Ltd.

• Yuhara Tetsuo

  Nagasaki Technical Institute Mitsubishi Heavy Industries Ltd.

関連論文

• Fundamental Study of Wave Impact Loads on Ship Bow : 4th Report : Effect of the Scale of the Model on Maximum Impact Pressure and Equivalent Static Pressure
• Fundamental Study of Wave Impact Load on Ship Bow (1st Report) : Maximum Impact Pressures Acting on A Semi-Cylindrical Body Like Bow of A Large Ship
• Fundamental Study of Wave Impact Loads on a Ship Bow (2nd Report) : Equivalent Static Pressure of Impact to Structural Response of a Rectangular Plate Panel
• Fundamental Study of Wave Impact Loads on Ship Bow : 3rd Report : Simulation of Bow Damage

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