Stiffened Cylindrical Shell Structure Optimization Design Study Of Reduction In Vibration And Noise

Underwater performance has always been a problem concerned by the people.The structure noise of these vessels derived from the internal mechanical excitationvibration, and drives the surrounding fluid medium vibration sound radiation;seriously affect the overall performance of underwater vehicle. Finite length stiffenedcylindrical shell structure is a submarine, torpedo and other aircraft cabin structureform, on the surface of the casing for various acoustic layer and optimizing itsstructure form is widely used and efficient way to improve the underwater stealthmethod. Study of acoustic layer absorption coefficient with the hydrostatic pressureand the cavity shape change characteristics and impact resistance, the acoustic layerstructure optimization design has the reference significance.To calculate the response, analysis the strength of stiffened cylindrical shellsunder the hydrostatic pressure, and dynamic stiffened cylindrical shell structuresunder wave loading. Quality in static optimization to minimize stiffened cylindricalshells as optimization objectives based on multiple Island genetic algorithmoptimization model of the static structure, single subject optimization statics stiffenedcylindrical shells under hydrostatic pressure effect depth. Through the optimization iseffective to reduce the structural weight, reduce engineering cost in some extent.Based on the analysis of the basic structure of the sound, the sound pressure level ofoptimization and acoustic optimization design research, in the improvement of thestructure dynamics and acoustic characteristics of cylindrical shell structure vibrationnoise, prediction has important significance. To meet the requirements on the basis ofvocal sound radiation, in order to improve the structure analysis of acousticcharacteristics of multilayer composite applications, in order to reduce the structurenoise, analyzes the external radiation sound power of sound field. Also on thestructure of the insulation layer structure optimization, is to meet various acousticperformance requirements on the basis of structure design of low noise, to meet theother functions under the condition that the structure radiant noise reaches theminimum.