Vibration Characteristics of Liquid-Filled Pipes Under Different Levels of Submergence

Abstract

Based on the acousto-solid coupling theory, the vibroacoustic radiation characteristics of the liquid-filled pipeline are studied under different submergence depths, and the changes of sound pressure level of pipeline are analyzed under different submergence depths of the flow transfer pipeline. The vibration characteristics of liquid-filled pipes with different submergence degrees were numerically analyzed from the pressure-acoustic domain and the solid mechanics domain, and the two-way coupled data exchange was realized by using acoustic-structural boundary multi-physical field function. The sound pressure level variation curves of the liquid-filled pipes were calculated for different submergence depths under the simultaneous action of internal and external flow fields, respectively. The results show that when the pipe is submerged in the lower and middle positions of the center of the circle, the sound pressure fluctuations of the pipe radiating outward are more consistent, and when submerged in the upper half, the sound pressure concentration phenomenon occurs in the lower and middle regions outside the pipe. When the free boundary outside the pipe is subjected to the boundary load, the pipe submerged in the lower position of the center of the circle is most obviously affected by the load. The tube submerged in the upper and lower positions of the center of the tube will produce two-way, increasing the form of sound pressure propagation in the tube towards the upper and lower sides, these findings can provide a certain reference for the study of pipe vibroacoustics. Therefore, research on the acoustic radiation properties of liquid-filled pipelines under various submergence depths is of great theoretical significance and engineering application value. This information can be applied widely in the fields of anti-fatigue design, fatigue damage analysis, and safety assessment of oil and gas pipeline structures, providing strong scientific support to ensure their safe and reliable service.