| Citation: | Yang Chen, Sun Wei, Ji Wenhao, et al. Dynamic modeling and vibration analysis of spatial fluid-conveying pipe under multi-point base excitations[J]. Journal of Aerospace Power, 2026, 41（X）：20260063 doi: 10.13224/j.cnki.jasp.20260063
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Aviation fluid-conveying piping systems are usually subjected to multi-point non-uniform base excitations under multi-clamp support conditions, making it difficult for traditional uniform loading models to accurately describe the actual load environment. To this end, based on the Transfer Matrix Method (TMM), this study conducts dynamic modeling and vibration analysis of pipeline systems subjected to multi-point base excitations, using typical space flow pipelines as the research subject. By introducing clamp constraints and spatial coordinate transformation matrices, the 14-equation model accounting for fluid-structure interaction (FSI) effects was extended to a multi-support spatial flow pipeline system. A method for independently applying base excitations at each clamp constraint location was proposed. By embedding excitations into the chain-solving process of the transfer matrix, it achieved the simulation of multi-point base excitations. Finally, the created model was validated by constructing an experimental system and combining it with finite element simulation. The model's prediction errors for the first six natural frequencies and the first-order resonance response amplitude were within 5.30% and 7.69%, thereby validating the reasonableness of the modeling approach. Based on this, the effects of hydraulic parameters and clamp constraint positions on the piping system were analyzed. The results indicate that fluid pressure dominates the decrease in the system's fundamental frequency, and the placement of clamps near elbows enhances system stiffness, thereby altering the vibration characteristics of the piping system. The relevant results can provide a theoretical basis for vibration reduction design and layout optimization of piping systems.
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