浮囊材料弹性模量对直升机着水冲击的影响OA

During the process of helicopter water landing,the characteristics of the float material have a significant impact on the helicopter's water impact and safety.To study the impact of float material elastic on it,the Arbitrary Lagrangian-Eulerian(ALE)method is used to conduct fluid-structure interaction simulations on the water impact on a helicopter-float combination.The influence on different float material elastic modulus on the helicopter's water landing attitude and impact overload is analyzed.The impact mechanism of helicopter water impact is elucidated.The influence on float material elastic modulus on the impact overload characteristics is revealed through the energy absorption percentage of the float.The result shows that the pitch angle amplitude of the helicopter during water impact decreases with the increase of float elastic modulus.The vertical overload peak of the helicopter decreases with the increase of float elastic modulus.The cushioning performance of the float enhances with the increase of float elastic modulus.When the elastic modulus increases from 0.167GPa to 0.667GPa,the energy absorption percentage of the float increases from 10.1%to 13.6%.