力激励与声激励作用下圆柱壳声振性能试验

Experiments of the vibration and sound radiation from cylindrical shells under force and sound excitation

以单、双层环肋圆柱壳为对象,通过模型试验分析圆柱壳内部介质与壳体的耦合对壳体声振性能的影响,进而对比分析力激励与声激励下,壳体振动与声辐射的关系以及单、双壳的声振性能.结果表明:当圆柱壳内部介质为空气时,声激励作用下声腔模态与结构模态耦合与否对壳体振动以及内部声场的影响很小;当壳体受力激励作用时,外场声辐射与壳体结构模态有关,当壳体受声激励作用时,外场声辐射与壳体结构模态、声腔模态有关;双壳的外壳对力激励和声激励时的振动与声辐射均起到屏蔽作用.

With single or double ring-stiffened cylindrical shells taken as an object, the model experiment was carried out to study the influence of the internal medium on the shell vibration and sound radiation, and the vibration and sound radiation of single/double cylindrical shells under different excitation were compared. The result shows that when the interior of cylindrical shells are full of air, the coupling between acoustic cavity and structure has little influence on the shell vibration and internal acoustic field; when shells are excited by force excitation, the sound radiation is related to structural vibration mode, and when shells are excited by sound excitation, the sound radiation is related to structural vibration mode and cavity mode;the outer shell of double cylindrical shells has a shielding effect to the vibration and sound radiation of cylindrical shells.