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产生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考虑其抗撞性能具有重要意义.本文以供应船撞击半潜平台为研究对象,基于碰撞外部动力学分析理论,在浮式平台规范法耗散能计算基础上,运用解析法推导出考虑平台艏摇运动响应的船舶非对心撞击平台耗散能求解方程,同时借鉴船-船碰撞耗散能估算方法,得到一般碰撞场景即考虑船-平台在碰撞过程中相对运动的耗散能解析式,并自编计算耗散能程序,实现船-平台碰撞碰撞耗散能的快速估算.最后通过非线性有限元分析(NLFEA)方法,计算出供应船与平台在碰撞过程产生的应变能并与解析法的算例结果进行对比,结果表明:规范法耗散能估算方法较为保守,不适用于一般碰撞场景下的耗散能估算;本文所提出的耗散能解析法可用于准确可靠地估算相类似船-平台碰撞场景下撞击船的耗散能.%There is a potential threat that offshore platform suffer from collisions with the nearby ships, resulting in severe structural damage and adverse effects on platform production safety. Therefore,more attentions need to be paid to the crashworthiness of the offshore platform in the design stage. In this paper, collision between a supply vessel and a semi submersible platform are studied, on the basis of the theory of external dynamics of collision and specification method of dissipation energy calculation of compliant platforms, the energy dissipation equation for the impact on platform with an offset is derived by means of analytical method. At the same time, the estimation method of dissipation energy of ship-ship collision is also used for reference, anda general collision scenario is derived, which considers the dissipation energy analysis of the relative motion of the ship platform during the collision, and a program for calculating the dissipation energy to realizes the fast estimation of the dissipation energy of collision between ship and platform is developed. Finally, the strain energy of the ship and platform during collision is calculated by nonlinear finite element analysis (NLFEA) method, and the results are compared with the results of the former analytical method. The comparison shows that specification method of dissipation energy estimation method is more conservative, not suitable for general dissipative collision scenarios can be estimated; the dissipation energybased on analytical method in this paper can be used to estimate the dissipation energy for the ship-platform collision scenario accurately and reliably.
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