气垫船碰撞冲击动力学响应三维数值模拟

Three dimensional numerical simulation of hovercraft dynamic impact response

基于有限元法建立气垫船碰撞数值模型,选取适合于气垫船碰撞的主从面接触算法,模拟气垫船在进、出坞时与舱口栏杆及舱壁碰撞的整个过程。由于气垫船质量与母舰相比极小,因此忽略其对母舰运动的影响,将舱壁及舱口围壁简化为刚性结构。在此基础上,分析气垫船与刚性平面及刚性曲面碰撞过程中的变形损伤、重心位移、重心速度及碰撞力的大小。分析结果表明,气垫船的碰撞过程分为弹性和塑性2个阶段,在塑性阶段产生的损伤具有局部性,且气垫船与曲面碰撞时更易产生横向摆动。

In this paper, the numerical model of hovercraft collision is first established based on the FEM,and the master-slave contact algorithm is then determined so that the process of hovercraft collision withbulkhead and hatch coaming when in or out the carrier can be simulated. Since the weight of hovercraft isvery small compared to the carrier, the movement of mother ship can be ignored, and the bulkhead andcoaming are simplified to rigid structures. Then, the deformation damage, displacement, and velocity ofbarycenter and the contact force are analyzed, which reveals that the hovercraft collision process can be di-vided into the elastic stage and the plastic stage. The damage during the plastic stage is local, and horizon-tal swing is more likely to occur when the hovercraft collides with curved surfaces.