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Acoustic and Anti-shock Capability Research of the Acoustic Layer Structure

Author: LiuWenHe
Tutor: YaoXiongLiang
School: Harbin Engineering University
Course: Design and manufacture of ships and marine structures
Keywords: Acoustic coating Sound absorption coefficient Impact resistance Cylindrical shell Structural stress parameters
CLC: U661.4
Type: Master's thesis
Year: 2007
Downloads: 228
Quote: 1
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Abstract


The underwater craft stealth has always been a concern . The structure of these aircraft noise from internal mechanical excitation casing vibration , and driven by the surrounding fluid medium the vibration sound radiation , a serious impact on the overall performance of the underwater vehicle . Limited long- stiffened cylindrical shell structure typical structure in the form of the submarines , torpedoes and other aircraft cabin , laying various acoustic coating the surface of the housing and optimize its structure is widely used and effective way to improve underwater vehicle stealth . Research covering the acoustic sound absorption coefficient of hydrostatic pressure and the change of the shape of the cavity characteristics , and impact resistance , acoustic cover layer structure optimized design with the reference value . Structural stress parameters of the cylindrical shell radiated noise . The main content of this thesis include : first , based on the acoustic performance acoustic overlay the inhomogeneous waveguide theory , export, transfer matrix containing the cavity acoustic cover layer and multi-layer structure of the surface absorption coefficient . And ANSYS to calculate deformation of the cavity structure under different hydrostatic pressure , the final characteristics of the the acoustic coating layer absorption coefficient changes with the hydrostatic pressure and the shape of the cavity . Secondly , by changing the performance parameters of the acoustic cover layer laying on the plate surface of the frame structure , the relationship between using the ABAQUS large non - linear dynamic analysis software for the acoustic cavity of the overlay structure of the deformation and the shock wave energy absorption has been studied to give overlay cavity structural deformation , the relationship between the velocity and acceleration of the shock wave energy absorption and acoustic overlay structure optimization, given the structural design and performance parameters of the acoustic covering both impact and vibration isolation function optimization tips . Stiffened cylindrical shell structure under different structural forms radiated noise has been studied using ANSYS to establish the parameters of different structural stress stiffened cylindrical shell computing model , using the finite element method calculation model coupled vibration FORCE response , re-use the structure of the surface of the displacement as a boundary element of boundary conditions , various acoustic physical quantities calculated SYSNOISE software , and ultimately get the structural stress parameters investigated stiffened cylindrical shell structure radiated noise .

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CLC: > Transportation > Waterway transport > Marine Engineering > Ship Principle > Ship structural mechanics
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