Dynamic characteristics analysis of a truncated conical thin-walled shell with acoustic-structure coupling

The 3D dynamic model of a truncated conical thin-walled structure is built using the ANSYS finite element software. The predicted results are in good agreement with the experimental data, thus validating the proposed model. The modeling involves solid finite elements for the structure and 3D acoustic elements for the sound field and the infinite elements for the free boundary conditions. The dynamic responses of the acoustic-structure coupling structure are investigated with numerical simulation approach. The effects of acoustic vibration on the structural dynamic characteristics are analyzed. The predicted results are found to be in good agreement with the vibro-acoustic test data. The number of resonant natural frequencies of the structure rises remarkably; their values decrease downward in most cases due to the effects of sound field. The amplitudes of the structural response increase in low frequency band and decrease in high frequency band.