厚壁充液加压管道流固耦合振动特性分析OA

The theoretical derivation and frequency-domain solution for axial fluid-structure interaction vibration of thick-walled pressurized fluid-filled pipes in marine engineering were carried out.The proposed calculation method was validated by comparison with literature examples.The applicability of thick-walled and thin-walled theories was investigated using finite element method(FEM)calculation and axial fluid pressure wave speed analysis.The effects of flow velocity and internal static pressure on vibration and noise transmission of straight pipes and assembled pipes were discussed.Results show that the thick-walled theory is more accurate for calculating the vibration response of pipes with a thickness-to-radius ratio greater than 0.5;the axial fluid pressure wave speed is mainly affected by pipe material,sectional thickness-to-radius ratio,and length-to-diameter ratio;internal pressure mainly influences transverse vibration,especially lower-order frequencies,and enhances vibration transmission.