二阶波浪力的切片理论与潜体上的垂向定常力

A Strip Theory for the Second-Order Wave Forces and the Steady Vertical Forces on Submerged Slender Bodies

二阶波浪力的三维理论基本上是对无航速的结构物建立起来的,航速的影响不甚清楚。一些理论问题,例如二阶绕射势辐射条件的提法,直到最近才得以澄清。即使如此,用三维方法完整地求取物体上的二阶波浪力仍十分费时。本文中对有航速的细长物体建立了二阶波浪力的切片理论,旨在提供理论上合理,实用上相对简便的二阶力计算方法。作为完整的二阶波浪力的一个组成部分,文中给出了细长潜体在不同港深和浪向角时所受的垂向定常力及其变化趋势。

Three-dimensional theories for the second-order wave forces on marine structures have been established mainly for the case of zero advancing speed. The influence of the advancing speed on the second-order forces is yet not clearly known. Some theoretical problems, such as the description of the radiation condition for the second-order diffraction potential. etc. , were solved only recently. Even though, the complete solution of the second-order wave forces on bodies by using 3-D theories is still complicated and time-comsuming. A strip theory for the second-order wave forces on slender bodies advancing in regular waves is established in the paper, the purpose of which is to provide an effective estimation method which is rational in theory and relatively simple in practice. As a component of the total second-order wave forces, the steady vertical forces on a submerged slender body and their variation in different submergence and wave angles are given and discussed.