Industrial pipeline systems are susceptible to vibration and noise pollution caused by fluid-structure interaction effects during high-speed fluid transportation. This study establishes a multi-field coupled dynamics model focusing on a representative U-shaped industrial pipeline to analyze vibration-induced noise propagation. Within this model, the internal flow field was computed using the Navier-Stokes equations and the Finite Element Method (FEM), employing the standard k-ε turbulence model and featuring indirect coupling with the structural field. The external acoustic field was modeled using acoustic wave equation-based finite elements and infinite elements, directly coupled to the structural field. Numerical simulations elucidated the structural dynamic characteristics of the pipeline under medium flow, clarifying the distribution characteristics of flow-induced structural radiation waves in the external acoustic field. It is found that acoustic pressure on the outer side of the bend is significantly lower compared to the inner side, with pronounced standing wave phenomena occurring on the inner bend surface due to wave interference. Furthermore, the frequency of the acoustic waves in the sound field was found to be closely related to the natural frequency of the pipe wall, confirming a strong structural-acoustic coupling mechanism. This work confirms structural-acoustic frequency coupling as the core noise mechanism, with standing wave characteristics and pressure migration patterns providing new foundations for industrial pipeline noise reduction design.