水陆两栖飞机波浪水面上降落耐波性数值分析

摘要

在规定的气象水文条件下,水陆两栖飞机起飞和降落的能力是决定其性能的重要因素,即耐波性能.采用ALE方法对流体域进行描述,运用基于微幅波理论的动边界数值造波方法模拟了不同波高和不同波长的动态海平面波浪,通过添加质量阻尼的消波方法抑制了固壁边界反射波对造波结果的影响,并采用罚函数耦合方法描述飞机与水体的耦合作用,研究了水陆两栖飞机在不同海情条件下波浪面上降落的纵摇运动、升沉运动以及底部压力等运动学和动力学特性,分析了水陆两栖飞机入水波浪的波长及波高对水陆两栖飞机耐波性能的影响,为飞机结构设计、水上降落操作规则制订及水陆两栖飞机耐波性物理水池试验提供参考.%The impact of aircraft with high speed on waves with powerful energy may cause high acceleration,violent changes in attitude angles of the aircraft or the fuselage deformation.This work simulated the 2-D waves with height of common waves based on the small amplitude wave theory for plane wave-maker.The plane wave-maker with simple harmonic motion disturbs the water to generate numerical waves in LS-DYNA.Mass weighted damping is applied to absorb the reflected waves from the rigid boundary.The water part is meshed by ALE elements and the aircraft is meshed by Lagrangian elements.The interaction between aircraft and water is simulated by the penalty function coupling method.Then,the simulation of amphibious aircraft landing on waves with different wave lengths and heights was performed and the following hydrodynamic results are obtained :the process of attitude angles change,the overload change at center of mass,at fore-body and rear-body,distribution of pressure at the bottom of the fuselage.