含内部子结构的圆柱壳振动特性研究

Research on vibration characteristics of cylindrical shell with internal substructure

针对圆柱壳-内部子结构的耦合结构,采用缩聚传递函数对其解耦,再根据直接刚度法分别建立圆柱壳和内部子结构的数值模型,并结合缩聚传递函数法计算了原耦合结构的振动响应.引入坐标转换矩阵并考虑6个方向的耦合,从而保证本混合方法的计算精度.与有限元计算结果进行对比分析,验证了该混合方法的有效性.在此基础上分析了结构厚度、壳体长度、边界条件及激励方向等因素对含内部子结构圆柱壳振动特性的影响.

Model of the cylindrical shell with internal substructure system was decoupled by the condensed transfer function.The dynamic behavior of cylindrical shell and the internal substructure model were obtained by the direct stiffness method respectively.Then the vibration response of the complex structure was solved by the condensed transfer function(CTF) method.The coordinate transformation matrix and the coupling in six directions were employed to ensure the calculation accuracy of the CTF method.The effectiveness of the CTF method was verified by comparing the calculation results with the finite element results.The influence of structural thickness,shell length,boundary condition and excitation direction on the vibration characteristics of cylindrical shells with internal substructures was analyzed based on research above.