流固耦合振动对损伤状态下的水上平卧式拱结构稳定性的影响研究

流体-固体两相介质交界面处的流固耦合模拟技术是目前广泛存在于水利、船舶、海洋以及航空航天等工程领域中的多学科交叉的重要研究课题。本项目延续流固耦合模拟中附连水质量方法高效、合理以及工程应用性高的特点，并在此基础上根据流体运动规律建立附连质量、附连阻尼、附连刚度分别与加速度、速度、位移之间的对应关系，基于有限元软件子程序开发模块编制上述对应关系程序，以载荷边条方式将流体对固体的耦合作用引入计算，并通过碰撞模型试验验证和优化新方法的有效性和合理性。利用流固耦合振动模拟新方法、附连水质量方法以及ALE方法对船舶撞击水上平卧式拱结构防撞装置的全过程进行模拟，重点研究船舶撞击载荷卸去后，弹性变形能释放引起的振动对撞击区域已损伤的柔性拱结构失稳状态的影响，以及对柔性拱支结构座强度的影响。

The fluid-solid coupling simulation methods were the important multi-disciplinary research subject existed in hydraulic engineering, vessel mechanics, ocean engineering and aerospace fields. The corresponding relations between the added mass , added damping , added stiffness and the acceleration , velocity , displacement of solid were constructed according to the fluid motion. Then , the corresponding relations were realized by programming based on the user subroutine modules of finite elements software. Finally , the correponding relations were imported in the finite elements simulation by means of load boundary conditions. The validity and rationality were verrified and optimized by collision model experiments. The whole process of collision between ship and anti-collision device was simulationed using the new fluid-solid coupling method , added mass method and ALE method.The influence caused by elastic deformation energy release after unloading the ship impact load on the overall stability and bearing strength of arch structure under a state of damage were focused.