船舶在遭遇畸形波浪时，瞬间的冲击会使波浪载荷急剧变化，严重时甚至会造成船舶倾覆。为探究能有效抵御异常波浪冲击的特种船型，本文以一型对极端海况下高强度波浪载荷具有优良适应性的埋首式无人艇为研究对象，分析了其在多种波浪环境下的运动特性。首先基于雷诺平均Navier-Stokes方程（RANS），考虑了不同波幅的五阶Stokes波、畸形波对无人艇水面运动的影响；其次使用DFBI模型对船舶纵摇和垂荡两个自由度的运动进行分析；再次对仿真结果进行可视化处理，分析了船体表面压力、总阻力、运动响应和载荷特性。结果发现：随着波幅增加，埋首式无人艇的波浪载荷增大，运动响应更加剧烈；与五阶Stokes波相比，无人艇在畸形波中的波浪载荷更小，对船体结构安全具有较好的保护性，原因在于埋首式无人艇艏部集合了锥形船艏与球鼻艏的优势，对流经船艏的波浪产生了分散、分割的效果，有效抑制了波浪的冲击力，保证了无人艇在极端海况的航行安全。本研究的结果可为埋首式无人艇在畸形波等极端海况下的安全航行提供技术支撑。

When a ship encounters an abnormal waves, the instantaneous impact will cause the wave load to change drastically, which may even cause the ship to capsize in serious cases. In order to investigate the special ship type that can effectively resist the impact of freak waves, this paper takes a submerged unmanned ship with excellent adaptability to high-intensity wave loads under extreme sea conditions as the research object, and analyzes its motion characteristics under various wave environments. Firstly, based on the Reynolds-averaged Navier-Stokes equations (RANS), the effects of the fifth-order Stokes waves and freak waves with different wave amplitudes on the water surface motion of the unmanned ship are taken into account; secondly, the motions of the ship's longitudinal rocking and pitching oscillations in the two degrees of freedom are analyzed using the DFBI model; and again, the results of the simulation are visualized to analyze the surface pressure of the hull, the total resistance, the motion response and the load characteristics of the ship. The simulation results are visualized again to analyze the surface pressure, total resistance, motion response and load characteristics. The results show that with the increase of wave amplitude, the wave load of the submerged unmanned ship increases, and the motion response is more violent; compared with the fifth-order Stokes wave, the wave load of the unmanned ship in the deformed wave is smaller, which is better for the safety of the hull structure, because the bow of the submerged unmanned ship combines the advantages of the conical bow and the bulbous nose bow, which can disperse and divide the wave flowing through the bow, and effectively inhibit the impact of the wave. This effectively suppresses the impact of the waves and ensures the safety of the unmanned ship in extreme sea conditions. The results of this study can provide technical support for the safe navigation of submerged bow-type unmanned ship in extreme sea conditions such as freak waves.