The influence of the stiffeners has no clear trends and has no important influence on radiated sound power.The longitudinal ribs have more influence than the ring ribs on the sound radiation.

• 增加纵肋或环肋时对圆柱壳的固有频率和辐射声功率的影响较为复杂和不显著,增加纵肋对减少结构声辐射的作用要大于对结构增加环肋对减少结构声辐射的作用。