冰区加强LNG船舷侧抗撞性能仿真研究

航行于北冰洋海域的LNG船必须具备抵抗冰山撞击的能力。针对LNG船纵骨架式和横骨架式冰区结构加强方案，开展比较分析，评价LNG船舷侧抵抗冰山撞击的能力。根据CCS规范对LNG船舷侧分别进行纵骨架式与横骨架式冰区加强设计。利用有限元数值仿真技术和LS_DYNA软件，模拟冰山撞击LNG船舷侧场景，得到船体结构变形、碰撞力和能量吸收等结果。研究发现：横骨架式在相邻强横肋位之间结构较弱，纵骨架式表现出更好的抗冰撞击性能；冰带加强骨材在抵抗冰载荷过程中发挥重要作用；在提高抗冰撞击性能的前提下，纵骨架式加强方案拥有更佳的经济效益。

Investigation on Crashworthiness of Ice-strengthened LNGC Side Structures through numerical simulation

The LNGC sailing in Arctic Ocean must have the capability to bear iceberg impact. Longitudinal framing and transverse framing schemes are compared to evaluate the crashworthiness of ice-strengthened LNGC side structures. According to CCS rules, LNGC side structures are ice-strengthened in longitudinal framing and transverse framing respectively. By using finite element numerical simulation technology and LS_DYNA software, the collisions between iceberg and side structures are simulated to obtain the structural deformation, the collision force and energy dissipation. It is found that the structure between the web frames of the transverse framing is relative weak to resist iceberg impact, while the longitudinal framing shows better crashworthiness; ice-strengthened longitudinals in longitudinal framing and ice-strengthened web frames in transverse framing play significant roles in undertaking iceberg impact; and from the viewpoint of crashworthiness, longitudinal framing scheme has a better economic benefit.