Finite element analysis of guided waves in fluid-filled corrugated pipes.
Finite element analysis of guided waves in fluid-filled corrugated pipes.
复制标题
充液波纹管导波的有限元分析。
DOI：
10.1121/1.2436711
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
L. Gaul
中科院分区：
文献类型：
--
作者：
M. Maess;J. Herrmann;L. Gaul
采用有限元法结合基于波的方法分析了自由波在充液波纹管中的传播。通过将离散化模型与基于波动的方法相结合，充分考虑了三维波导中波动的复杂机制。管道被视为在波传播方向上具有周期性特性的波导。这些导波的分析导致色散曲线，显示出不同波模式的强烈的频率依赖性。该方法还允许包含在声学-结构界面处发生的流体传播和结构传播波模式之间的耦合。在后处理步骤中导出波模式的相速度和群速度。此外，计算了流体域和固体域振动能的能量比。最后，线性阻尼模型，以探讨波模式衰减。
Free wave propagation in fluid-filled corrugated pipes is analyzed using finite element methods in combination with a wave-based approach. By combining discretized models with a wave-based approach, complex mechanism of wave motion in the three-dimensional waveguide is fully included. The pipes are treated as waveguides having periodic properties in the direction of wave propagation. The analysis of these guided waves leads to dispersion curves which show the strong frequency-dependency of the different wave modes. The method also allows the inclusion of coupling between fluid-borne and structure-borne wave modes which occur at the acoustic-structure interface. Phase and group velocities of the wave modes are derived in postprocessing steps. Additionally, the energy ratio of the fluid-domain and solid-domain vibrational energies is computed. Finally, linear damping models are included in order to explore wave mode attenuation.