舵翼结构对水下航行器尾部振动声辐射的影响

RESEARCH ON THE SOUND RADIATION OF THE STERN OF SUBMARINE WITH RUDDER AND VANE

针对带有舵翼的水下航行器尾部结构模型,研究舵翼对水下航行器尾部的振动及声辐射的影响。利用有限元和直接边界元法求解模型在流体中的动态特性。其计算步骤共分为四步:1.利用有限元方法对模型进行划分,并得到模型的“干”模态参数;2.根据上一步得到的结果,利用有限元和直接边界元的混合方法得到模型浸没在流体中的“湿”模态参数;3.将得到的“湿”模态参数进行模态叠加获得模型在内部激励下的响应;4.根据模型表面的位移和速度得到周围流场的声压分布。结果显示舵翼结构与周围流体的相互作用很大,改变其尺寸和刚度会使得模型的声压发生很大的变化,同时流固耦合现象的存在使得模型在水中的频率明显下降,并且模态阶数的顺序也发生了改变。

The vibration and sound radiation behaviors of the stern of submarine with rudder and vane are studied. The boundary element method combined with the finite element method is used to solve the problem. The models, with different rigidity and length of rudder and vane, are used to compare the sound radiance in the water. The numerical results explain that the vibration and sound radiation of stern can be degraded by enforcing the rigidity of rudder or reducing the length of the vane.