双层复合管流固耦合振动的动力特性分析

Dynamic Characteristics of Fluid-Structure Interaction Vibration in Double Layer Pipe

摘要: 基于复合材料力学层合板的并联和串联模型，将双层复合管等效简化为单层管，在此基础上对空管分别进行了理论计算、数值模拟和实验研究，验证了模型的有效性；对于充液复合管的流固耦合系统进行等效简化，然后应用行波法计算其固有频率，并与数值模拟和实验结果进行了对比，证实了行波法简洁且有效；最后采用行波法讨论了双层复合管中材料和尺寸的变化对结构固有频率的影响。研究结果表明，并联简化模型较适用于含有金属材料的管道，而串联模型适用于非金属材料管道；行波法计算方便快捷，宜于编程实现，且计算结果与已有成果吻合良好。

Abstract: Based on the parallel and the serial model for laminated plates of composite material mechanics, the double layer pipe is equivalent simplified as single pipe. On this basis, the respectively theo-retical calculation, numerical simulation and experiment research about the empty pipe proof the effectiveness of this model. The natural frequencies of fluid-solid coupling system of liquid filled composite pipe are calculated by using the traveling wave method, and the results are made comparison between the results of numerical simulation and experiments; they confirm the conciseness and effectiveness of the traveling wave method. Finally the influence of the material and size in double layer composite pipe on the natural frequency of the structure is discussed by the traveling wave method. The results show that the parallel simplified model is more suitable for the metal pipes while the serial model is more suitable for the metalloid pipes; the traveling wave method is clear for problem-solving, suitable for programming, and the calculation results are consistent with the existing results.