Numerical and experimental investigation of vibro-acoustic characteristics of a submerged stiffened cylindrical shell excited by a mechanical force

The Application of the Coupled Acoustic-Structural Approach (Casa) Method on the Free Vibration of Submerged Structures

“…In a study conducted by Gao et al (2022), the vibration and sound radiation of a typical stiffened cylindrical shell structure were measured under broadband excitation underwater. The results were compared to those obtained through the numerical finite element/boundary element (FE/BE) coupling method to ensure accuracy.…”

“…The general FE/BE method adopted in the experiment to figure out the stiffened cylindrical shell's vibroacoustic characteristics, and the FE and BE model are shown in Fig. 8 (Gao et al, 2022). The EWD was set to four times the outer diameter of the cylindrical shell, with an approximate global mesh size of 0.02 m. This produced a total number of elements and nodes of 102976 and 147828, respectively.…”

“…8a, the apparatus is placed 50 mm away from the center line of the cylindrical shell, and the stiffener sections are (80 𝑥 10) mm with 450 mm spacing. A 1400 kg iron ballast was connected at the bottom of the cylindrical shell with rings and wires to balance gravity and buoyancy in the experiment (Gao et al, 2022). This created a simulation quality of 900 kg, which was reached by setting the steel density to 10100 kg/m 3 .…”

“…Fig. 9 shows six eigenmodes of the submerged stiffened cylindrical shell from Gao et al (2022). The first, third, fourth and fifth modes all concern ovalities in the cylindrical shell.…”

“…Valentín et al (2017) performed tests on a rig that involved a stainless steel disk attached to a shaft and placed in an aluminum tank filled with water. In Gao et al (2022), a typical stiffened cylindrical shell's vibration and sound radiation under broad excitation were measured underwater. ExxonMobil (Wang et al, 2013) conducted model tests using an M-shaped jumper model to evaluate the accuracy of potential VIV prediction methods.…”