Dynamics modeling and vibration transmission visualization of fluid-conveying series pipe system based on FEM-TMM

Abstract

The fluid-conveying series pipe system (FCSPS) is an important part of the pipe system, and its stress response solution and vibration transmission analysis are of great significance to life prediction and defect analysis. In this paper, the finite element method (FEM) and transfer matrix method (TMM) are combined. The dynamics modeling method named FEM-TMM is proposed to solve the stress response of the FCSPS, and the structural intensity method (SIM) is used to perform vibration transmission visualization. The incompatible solid (Solid-NC) and virtual beam (VBeam) elements are constructed to establish the finite element model of the solid and fluid domains respectively. The zero-thickness (Z-T) and coupling elements are created to simulate the contact of the pipe joint and fluid-solid coupling. TMM is used to solve the responses of fluid velocity and pressure (FVAP) in the frequency domain, then FEM-TMM for the pipe system is obtained and verified by experiments. Furthermore, the stress smoothing method and SIM are introduced to solve the stress response and perform vibration transmission visualization. The results show that the SIM can visualize the vibration transmission of the pipe system, and the pipe joint plays the role of transmission, conversion, and redistribution of vibration energy.