Prediction of structural response during water entry is of great significance for the design of naval architecture and aircraft. In order to study fluid-structural interaction (FSI) of flexible wedge during water entry, coupling algorithms based on boundary element method (BEM)/Wagner theory and modal superposition method (MSM) are utilized. The first solution is a numerical method by coupling BEM and MSM based on domain decomposition technique. The second solution is a semi-analytical method by coupling Wagner theory and MSM. Non-linear pressure composition in the Bernoulli equation is used to improve the accuracy for wedge with moderate deadrise angles. The implicitly Newmark-β scheme is employed for time marching of structural dynamic equation. Effects of hydroelasticity on fluid pressure and structural response are studied by the comparison between coupling and decoupling solutions. The results show that the structural response is significantly affected by the presence of fluid added mass and damping. Structural response is lagged due to the fluid added mass and damping. Besides, the latter one causes the decrease of amplitudes of slamming load and structural response. This paper highlights the effect of hydroelasticity on slamming load and structural response during water entry of flexible structure.

进水过程中结构响应的预测对于海军建筑和飞机的设计具有重要意义。为了研究柔性楔入水过程中的流固耦合，采用基于边界元法（BEM）/瓦格纳理论和模态叠加法（MSM）的耦合算法。第一种解决方案是基于域分解技术的BEM和MSM耦合的数值方法。第二种解决方案是结合Wagner理论和MSM的半分析方法。Bernoulli方程中的非线性压力成分用于提高具有中等死角的楔形的精度。隐式Newmark-β方案用于结构动力学方程的时间行进。通过耦合和解耦解的比较研究了水弹性对流体压力和结构响应的影响。结果表明，结构响应受流体附加质量和阻尼的存在显着影响。由于流体增加的质量和阻尼，结构响应滞后。此外，后一种会导致冲击载荷的幅度和结构响应的减小。本文着重介绍了水弹性在挠性结构入水过程中对冲击载荷和结构响应的影响。后者导致了冲击载荷和结构响应幅度的减小。本文着重介绍了水弹性在挠性结构入水过程中对冲击载荷和结构响应的影响。后者导致了冲击载荷和结构响应幅度的减小。本文着重介绍了水弹性在挠性结构入水过程中对冲击载荷和结构响应的影响。