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Research on the Sound Radiation Characteristics of the Periodic Damping Plate Structure

Author: ChenHaoJie
Tutor: ZhouJingDong
School: Hubei University of Technology
Course: Mechanical Manufacturing and Automation
Keywords: Sound radiation periodic damping finite element boundary element
CLC: TB532
Type: Master's thesis
Year: 2013
Downloads: 3
Quote: 0
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Abstract


As our society developed so fast in last few decades,noise of traffic,industry,architecture,society and family have affected the daily life seriously,it makes noisepollution becomes a serious social pollution.Now control vibration and reduce noise ofevery kinds of mechanical structure have became an indispensable part of many hugebuild and mechanical structure progress. Plate structure is wildly applied in practicalproject, and the basic theory of plate vibration is mature.So based on the theory ofplate vibration,it is feasible to make a study on radiation noise problem of periodicdamping structure.For the effect of the acoustic radiation properties of different periodic dampingstructure,this paper conduct a research on the acoustic radiation properties ofone-dimensional periodic damping structure and plate structure based ontwo-dimensional periodic damping structure with holes.First,use the finite element software to establish the simulation model of thestructure,find out the exists of low frequency band gap through the current band gaptheory,then use acoustic analysis software to calculate sound pressure、sound power andradiation efficiency.Make a analysis on spectrum diagram of the sound pressurespectrum、sound power and radiation efficiency,get the relation of the sound power andradiation efficiency of the plate with the band gap.Secondly，in actual projects，there are errors when installing the periodic dampingstructure by manual work.So this paper model multiple plate structure based oninterveined damping strips,carry on massive numerical calculation of vibration andacoustic radiation characteristics on the model,through the comparisons of numericaldata,it proves that the plate structure based on interveined damping strip can be betterreduce the acoustic radiation of plate,and in order to reduce the acoustic radiation of theplate furthest, each of interveined damping strip structure has the best installation angleof13degree.Once more,in the foundation of the research of the one-dimensional periodicdamping structure,conduct simulation analysis on plate structure based on twodimensional periodic damping structure with holes,through the comparisons of structurevibration modal,transfer function and the curve of acoustic radiation characteristic,itproves that plate structure based on two-dimensional periodic damping structure withholes have better vibration and noise reduction properties,but the theory and algorithmsneeds to further improve.Last,make an experimental confirmation of the vibration and sound radiationcharacteristic the plate and the plate structure based on damping strips respectively,andthe results of simulation agree well with the experimental data.It proves theeffectiveness of the simulation calculation.

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CLC: > Industrial Technology > General industrial technology > Acoustic engineering > Vibration, noise and its control > Vibration and radiation of the vibrating body
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