船舶の波浪衝撃水圧簡易計算法について

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Water impact loads induced on a hull by slamming sometimes cause heavy damages to hull structures. Therefore estimation and evaluation of slamming loads are important and inevitable for the design of ships. This paper proposes a simplified method to estimate impact pressures on vessels in waves. Stavovy & Chuang's empirical method has been used for a long time to this purpose. But there is much room for improvement in this method, such as in the definition of impact velocity and the use of Chuang's empirical formula to calculate impact pressures with imapct angle and impact velocity. Outline of the present method is described as follows. At first, an impact velocity is derived from a relative velocity between hull surface and wave using a simple way, and an impact angle is calculated with geometric relation of the hull and the wave surface. Next, an impact pressure is calculated with Wagner's formula, which is supplemented with Ferdinande's impact theory for large impact angles. Then, an effective impact pressure on a structural object such as a panel or a beam is to be calculated using impact peak pressures and pressure reduction factors which are computed beforehand according to impact angles and ratio of sizes of the object. For validation of this method, impact pressures corresponding to Chuang's threedimensional impact tests are estimated using the present method. The comparioson between estimated and measured impact pressures gives comparatively good results.
社団法人日本船舶海洋工学会の論文
2001-03-12

船舶の波浪衝撃水圧簡易計算法について

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