The Numerical Methods Research of Coupled Vibration and Sound Radiation of Underwater Structures
|School||Huazhong University of Science and Technology|
|Course||Design and manufacture of ships and marine structures|
|Keywords||Structural vibration Acoustic radiation Fluid-structure interaction Finite Element Boundary Element Modal Analysis|
The submarine is a typical underwater structure . The underwater structural vibration and sound radiation involves the coupling effect of the structure and flow field , external incentive structure vibration, vibration transmitted to the surface of the structure and the sound field in an aqueous medium , while the sound field generated reaction force , the surface of the structure and fluid structure the media exists between the role of fluid-structure interaction . In order to more accurately assess the vibro-acoustic properties of the submarine , underwater structures fluid-structure interaction study engineering . Physical coordinate system and the modal coordinate system the convective structure interaction problems have been studied using numerical methods . In the physical coordinate system , this paper explores a finite element boundary element method on acoustic vibration for underwater structures : finite element software ANSYS analysis of structure , substructure method calculated structural mass and stiffness matrices ; based on boundary element theoretical treatment outside the fluid domain , the added mass matrix and additional damping matrix obtained use MTALAB programming ; mass matrix will be regarded as additional superimposed to the structural mass matrix , additional damping matrix as a power equation of damping, stiffness matrix unchanged , programming Computing Architecture surface sites mobile response ; the further acoustic software SYSNOISE calculated sound radiation . The results show that the method is feasible in theory , the value of further research . Modal coordinate system , the use of numerical software with a new idea of a cylindrical shell structure coupled modal analysis , calculated modal attached water quality , and modal added mass and modal relationship . This study has some practical value, but also provides a reference for further research work .