Parametric finite element modeling and vibration analysis of Z-shaped pipeline with multi constrained layer damping patches

In order to improve the efficiency of pipeline dynamic vibration reduction design, the parametric finite element modeling method of the Z-shaped pipeline with multiple constrained layer damping(CLD) patches was studied, which takes the geometry parameters, position parameters and material parameters material parameters of the CLD patches as the design variables. Firstly, the parametric modeling concept of pipeline system was expounded, and the parameters involved in the parametric modeling process of pipeline system were distinguished according to uncontrolled parameters and controlled parameters. Secondly, the pipe body was divided along the axial direction and the grid was divided along the circumferential direction at a fixed angle. The correspondence between the element nodes of the CLD patches and the pipe body was kept. The update of the clamp node number adapted to parameterization was completed by creating a parameterized circular array for storing the position of the clamp nodes. Thirdly, a case study was carried out. The parametric finite element modeling of Z-shaped pipeline system corresponding to three application schemes was realized by the described method. Finally, by comparing the vibration parameters of pipelines before and after application constraint damping, the vibration reduction effect of each scheme was evaluated. The results show that the first-order resonance response of the pipeline system with CLD decreases in different degrees. The circumferential application range of the CFD patches has the greatest impact on the vibration response, and increasing the application length and damping layer thickness is beneficial for vibration reduction. © 2023 Central South University of Technology. All rights reserved.