悬臂梁-流体-悬臂梁耦联系统的湿模态相互作用

THE WET MODE INTERACTION OF CANTILEVER BEAM LIQUID CANTILEVER BEAM COUPLED SYSTEM

应用流体的势流理论及悬臂梁振动方程，本文分析了悬臂梁流体悬臂梁耦联系统的自由振动问题。分析表明，悬臂梁除与流体发生相互作用外，两悬臂梁湿模态通过流体的耦合也发生相互作用，后者的作用使流固耦联系统的湿模态呈现新的振动特性，同一阶两个子结构（梁１，２）各自的干模态分别对应耦联系统同一阶的两个湿模态，一个以较低的湿频率出现，两梁呈反相位振型，另一个以较高的湿频率出现，两梁呈同相位振型。

Based on the potential flow theory of liquid and vibration equation of cantilever beam, the free vibration problem of cantilever beam liquid cantilever beam coupled system is analyzed in this paper. The analysis shows that both the beam liquid interaction and the beam beam interaction are present. The latter interaction gives rise to a new dynamic property in the coupled system. Two same order dry modes of substructures(beams 1,2) correspond to two same order wet modes of the coupled system respectively. For the lower wet frequency, the two beams are in the opposite phase. For the higher wet frequency, the two beams are in the same phase.