Reinforced Thin-walled Structural Vibration And Sound Radiation Theory And Applied Research

The complex structure made up of the thin stiffened structure is the most common structure of aviation, spaceflight and navigation. Vibro-acoustic control can be well actualized with understanding of the vibro-acoustic characters of the thin stiffened structure in liquid medium. Therefore, researches of fluid-structure interaction should be carried out with high demand.Fluid-structure interaction has been highly concerned by researchers and it has been considered among the most difficult questions for research of the vibro-acoustic characters of the thin stiffened structure. Consequently this thesis mainly includes the following three aspects. The first is analysis of structural-acoustic coupled models,the second is research on bilateral coupled vibro-acoustic characters of the thin shell structure, the third is analysis of an actual example of the thin stiffened structure. Structural-acoustic coupled characters has been obtained according to the modal analysis of the thin shell structure and the acoustic cavity. Structural vibration response has been obtained according to solving a problem on interior power in liquid medium by using software ANSYS and software SYSNOISE, then the bilateral coupled vibro-acoustic characters of the thin stiffened structure acted interior power in fluid medium has been carried out by using structure FEM, fluid FEM and BEM. According to the research of the vibro-acoustic problem about the thin stiffened structure considering fluid-structure interaction, we have supplied reference to reducing and controlling vibration and acoustic radiation of the structure template in the course of pouring concrete.