一种新的碰撞耗散能快速估算方法及其在船—平台碰撞事故中的应用研究

海洋平台在作业过程中存在遭受船舶碰撞的潜在危险,一旦事故发生将可能导致结构严重损伤从而影响平台的作业安全,因此在平台结构设计阶段需要考虑其抗撞性能.文章以海洋供应船撞击半潜式钻井平台为研究对象,基于碰撞外部动力学理论和DNV规范计算方法,计及平台艏摇运动响应的影响,提出了一种新的耗散能估算方法-DNV`R解析法.以非线性有限元船-平台碰撞数值仿真结果为参考,将该解析法与规范法、Zhang解析法及Liu解析法计算结果进行对比,研究得出:文中所提出的DNV`R解析法弥补了规范法较为保守且仅适用于对心碰撞场景的不足,计算过程简单、便捷,且计算精度与Zhang解析法和Liu解析法基本接近,能够满足船-平台碰撞耗散能快速估算的精度要求.

A New Method for Fast Estimation of Collision Dissipated Energy and Its Application in Ship-Platform Collision Accident

In the course of operation, the offshore platform has the potential risk of collision with ships. Once an accident occurs, it may cause serious damages to the structure of the platform and af-fect the safety of operation. Therefore, more attention should be paid to the crashworthiness of the offshore platform in the design stage. In this paper, collisions between an ocean supply ship and a se-mi-submersible drilling platform are studied. Based on the collision external dynamic theory and DNV specification calculation method, taking into account the influence of yawing motion response to plat-forms, a new dissipated energy estimation method, named DNV`R method, is proposed. Using the numerical simulation results of nonlinear finite element of ship-platform collision for reference, this analytic method is compared with the specification method, Zhang's method and Liu's method. The comparison shows that the DNV`R method fills the gap of the limitation of the specification method that is conservative and only applicable for central impact. The DNV`R method is simple and con-venient. And its calculation results are close to those of Zhang's method or those of Liu's method, which meets the accuracy requirements of fast estimation of ship-platform collision dissipated energy.