与其他波导结构的动力耦合边界以及自身波导属性的变化使复合材料圆柱壳结构具有复杂的弹性波动力学特性，其弹性波传播特性与损耗机理对结构减振设计非常重要。弹性波入射到波导属性变化的耦合界面及动力耦合边界处发生反射和散射，产生弹性波相互耦合、波型转换以及局域共振衰减现象，由此导致弹性波传播特性与损耗机理变得十分复杂。本项目采用回传射线矩阵法，从自由振动与复波数频谱特性、瞬态波传递规律、稳态响应频谱特性等多角度开展理论建模与机理研究。主要研究内容为：复杂边界条件下波导属性变化的复合材料圆柱壳结构弹性波动理论建模；波导属性变化的复合材料圆柱壳结构复波数频谱特性分析；复杂边界条件下复合材料圆柱壳结构瞬态波传递规律及稳态响应频谱特性分析；复合材料圆柱壳结构模型验证实验。项目研究旨在揭示动力耦合边界下波导属性变化的复合材料圆柱壳结构弹性波传播特性与损耗机理，为复合材料圆柱壳结构减振设计提供理论基础。

The dynamic coupling connection with other waveguide components and the variation of waveguide properties provide the composite circular cylindrical shell (CCCS) with complex elastic wave behaviors, which are significant for structural design of vibration control. The elastic waves reflect and scatter at the coupling interface and the dynamic coupling boundary where the waves incident the waveguide and the phenomena of waves coupling, transformation and local resonant attenuation occur. As a result, it becomes very complicated to reveal the propagation characteristics and attenuation mechanism of the elastic waves. In this project, the method of reverberation-ray matrix is adopted to perform the theoretical modeling and mechanism research from the aspects of free vibration behaviors, complex wavenumber spectral characteristics, propagation characteristics of transient waves and spectral characteristics of steady-state forced vibration responses. The main contents include: theoretical modeling of the CCCS with variable waveguide properties under dynamic coupling boundary conditions; analysis of complex wavenumber spectral characteristics of the CCCS with variable waveguide properties; propagation characteristics of transient waves and spectral characteristics of steady-state forced vibration responses of the CCCS under the dynamic coupling boundary conditions; experiment verification of theoretical modeling of the CCCS. This project is devoted to reveal the propagation characteristics and attenuation mechanism of elastic waves through the CCCS with variable waveguide properties and dynamic coupling boundary conditions, so as to provide a theoretical basis for the vibration control design of the CCCSs.