Ricochet Characteristics of AUVs during Small-Angle Water Entry Process
Ricochet Characteristics of AUVs during Small-Angle Water Entry Process
复制标题
AUV小角度入水过程中的跳弹特性
DOI：
10.1155/2019/9518437
复制
发表时间：
2019
影响因子：
--
通讯作者：
Yao Shi
中科院分区：
文献类型：
--
作者：
Guo-Xin Yan;Guang Pan;Yao Shi
当自主水下航行器（autonomous underwater vehicle， AUV）以小角度入水时，水下航行器的头部会受到一个使其上升的扭矩，这个扭矩可能会导致水下航行器的弹跳。跳弹的发生对水下航行器的弹道稳定性有重要影响。本文采用有限元法-光滑颗粒流体力学（FEM - SPH）耦合算法，吸收了有限元法处理大变形和网格畸变的高效率和SPH法处理大变形和网格畸变的优点，对水下机器人的小角度入水问题进行了数值研究。在FEM - SPH耦合算法中，采用离散粒子对水区域进行建模，而对水下航行器部分进行有限元建模。一种接触算法将有限元和粒子耦合在一起。重点研究了不同头部半球角度和不同初始条件对水下机器人弹跳轨迹的影响。给出了水下航行器产生弹跳现象的临界条件和影响因素。
When the autonomous underwater vehicle (AUV) enters the water at a small angle, the head of the AUV will be subjected to a torque that causes it to rise, which may cause the AUV to ricochet. The occurrence of ricochet will have an important impact on the trajectory stability of the AUV. In this paper, the finite element method‐smoothed particle hydrodynamics (FEM‐SPH) coupling algorithm, which absorbs the high efficiency of FEM and the advantages of SPH in dealing with large deformation and meshes distortion, is used to study the small‐angle water entry problem of the AUV numerically. In the coupled FEM‐SPH algorithm, discrete particles were used to model the zone of water, while the part of the AUV was modeled with finite elements. A contact algorithm couples the finite elements and the particles. Particular attention was paid to the influence of different head hemisphere angles and different initial conditions on the ricochet trajectory of the AUV. The critical conditions and influencing factors of the AUV ricochet phenomenon were given.