Fluid-structure interaction characteristics analysis of composite liquid-filled pipeline

Here,to study fluid-structure coupled characteristics of braided composite liquid-filled pipeline, a ID fluid-structure coupled dynamic model of composite pipeline was established using the transfer matrix method based on anisotropic material constitution equation, physical equation and boundary conditions. The model was degenerated into isotropic pipeline to verify calculation method, and the fluid-structure interaction verification of composite pipeline FEM software was further performed. The calculation results showed that the calculation results using the proposed method are consistent to those of the classical "4 equation" model and the finite element 3D model. After proving the correctness of the proposed model and calculation method, effects of laying angle and fiber volume fraction in composite pipeline on natural frequencies and wave number of liquid-filled pipeline were further studied. The results showed that natural frequencies of pipeline increase and its propagation wave number decreases with increase in volume fraction of reinforcement material ; as laying angle increases,natural frequencies decrease,and propagation wave number in pipe wall increases ; the study results can provide a reference for design and control of liquid-filled pipeline. © 2023 Chinese Vibration Engineering Society. All rights reserved.