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1、江蘇大學(xué)碩士學(xué)位論文微穿孔板吸聲結(jié)構(gòu)的吸聲性能及其優(yōu)化姓名：祝瑞銀申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：環(huán)境工程指導(dǎo)教師：趙曉丹20070601江蘇大學(xué)工程碩士學(xué)位論文摘要本文根據(jù)馬大猷教授的微穿孔吸聲理論，討論了微穿孔板吸聲結(jié)構(gòu)的基本特性。計(jì)算研究了單層微穿孔板吸聲結(jié)構(gòu)的吸聲系數(shù)，影響微穿孔板吸聲結(jié)構(gòu)吸聲性能的參數(shù)主要有穿孔孔徑、板的厚度、穿孔率及空腔深度。通過(guò)理論計(jì)算和實(shí)驗(yàn)數(shù)據(jù)對(duì)這些參數(shù)進(jìn)行分析，得到微穿孔板的吸聲特性：穿孔率小對(duì)獲得高的穿孔吸聲系數(shù)有利，穿孔率不宜超過(guò)4％；在條件容許的情況下，背腔深度宜盡可能大，對(duì)提高低頻的吸聲系數(shù)有利；孔徑則是以盡可能小為好；選用較厚的板也可以提高吸聲系數(shù)
2、。進(jìn)一步對(duì)雙層微穿孔板結(jié)構(gòu)進(jìn)行了研究．在單層微穿孔板計(jì)算方法的基礎(chǔ)上，進(jìn)行了雙層微穿孔板吸聲系數(shù)的計(jì)算，與單層微穿孔板進(jìn)行了比較，說(shuō)明了雙層結(jié)構(gòu)研究的重要性。應(yīng)用遺傳算法對(duì)其結(jié)構(gòu)參數(shù)進(jìn)行了優(yōu)化，結(jié)果表明，雙層微穿孔板在經(jīng)過(guò)遺傳算法優(yōu)化之后，在所選頻率范圍內(nèi)能夠獲得飽滿(mǎn)的吸聲系數(shù)曲線，與未優(yōu)化的雙層結(jié)構(gòu)相比，吸聲性能有了顯著的提高，不僅得到了高的吸聲系數(shù)，而且吸聲頻帶也相應(yīng)加寬，通過(guò)實(shí)驗(yàn)也驗(yàn)證了理論計(jì)算的正確性。為實(shí)際工程應(yīng)用提供了理論基礎(chǔ)。關(guān)鍵詞：噪聲控制；微穿孔板；吸聲系數(shù)；遺傳算法；優(yōu)化設(shè)計(jì)。江蘇大學(xué)工程碩士學(xué)位論文ABSTRACTBasedonMaDayou'smicro-pe
3、rforatedpanelabsorbingtheory,thisthesisdiscussedthefundamentalpropertyofmicro—perforatedpanelabsorber．Theparametersthataffecttheabsorptioncharacteristicsofmicro-perforatedpanelaletheperforation-aperture，thethicknessofperforatedpanel，theperforationarearatioandthedepthofthecavity．Theseparametersh
4、avebeenanalyzedbytheoreticalcalculationandtheresultofexperiment．Thefollowingabsorptivecharacteristicsofmicro-perforatedpanelabsorberhavebeenfound．Itisbenefittoselectanduselessperforationrateandtheperforationrateusuallyshouldbenotmorethan4％．Underthepossibleconditionitisbettertoselectthelongdepth
5、ofthecaVitywhichishelpfultoimproveabsorptioncoefficientinlowfrequency．Inusualtheperforation-apertureshouldbeassmallaswhichitcanbemachined．Usingthickermicro—perforatedpanelisalsobenefitforgettinghigheracousticsabsorptioncoefficient．Further,doublelayermicro—perforatedpanelstructureisresearched．Ma
6、kingUSeofthesinglelayermicro—perforationpanelreckoning，theacousticsabsorptioncoefficientofdoublelayermicro-perforatedpanelstructureiscalculated．Comparingwithsinglelayermicro-perforationpanel，doubMlayermicro-perforatedpanelstructurehashigheracousticabsorptionability．Doublelayermicro-perforatedpa
7、nelstructureisresearchedtobeopthnizedbytheGeneticalgorithmmethod．Itisnotedthatafteroptimizationdoublelayermicro-perforatedpanelstructurec孤getmoresatisfactoryabsorptioncurve．ItsacousticscharacteristicshavebeimprovedaloLbothinitsaco
