Dissertation
Dissertation > Transportation > Waterway transport > Marine Engineering > Ship Principle

The Numerical Methods Research of Coupled Vibration and Sound Radiation of Underwater Structures

Author ChenWei
Tutor ChenMeiXia
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
CLC U661
Type Master's thesis
Year 2009
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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 .

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