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1、第38卷第5期儀器儀表學(xué)報(bào)Vol38No52017年5月ChineseJournalofScientificInstrumentMay.2017非規(guī)則結(jié)構(gòu)表面多聲源近場(chǎng)聲全息方法11,2宋玉來(lái),胡紅生(1.嘉興學(xué)院機(jī)電工程學(xué)院嘉興314001;2.嘉興嘉嘉汽車零部件制造有限公司嘉興314005)摘要:為了提高非規(guī)則結(jié)構(gòu)表面多聲源聲場(chǎng)的全息精度,提出基于目標(biāo)深度識(shí)別與球面波疊加逼近的非規(guī)則表面多聲源近場(chǎng)聲全息方法。該方法使用聲源空間深度識(shí)別理論,確定結(jié)構(gòu)體上各聲源的空間位置,在各聲源處分別使用球面波的疊加描述空間聲場(chǎng)分布,然后結(jié)合現(xiàn)有單原點(diǎn)球面波疊加近場(chǎng)
2、聲全息法重構(gòu)聲場(chǎng)。為了驗(yàn)證方法的可行性,首先使用所述方法和現(xiàn)有單原點(diǎn)球面波疊加聲全息法,分別對(duì)徑向脈動(dòng)球與橫向振動(dòng)球組成的不同聲場(chǎng)進(jìn)行全息重構(gòu)。結(jié)果表明,當(dāng)聲源集聚分布時(shí),所述方法與現(xiàn)有方法均能有效全息重構(gòu)聲壓分布,重構(gòu)誤差在5%以下;當(dāng)聲源離散分布時(shí),現(xiàn)有方法失效,所述方法能夠較準(zhǔn)確地給出重構(gòu)面的聲壓分布,主要頻段內(nèi)的全息重構(gòu)誤差小于20%。進(jìn)一步的對(duì)比實(shí)驗(yàn)表明,在全息重構(gòu)多揚(yáng)聲器非規(guī)則空間分布聲場(chǎng)時(shí),使用所述全息方法的重構(gòu)誤差平均下降14.08%,顯著提升了多聲源非規(guī)則空間分布聲場(chǎng)的全息精度。關(guān)鍵詞:多聲源聲場(chǎng);球面波疊加;聲源深度識(shí)別;近場(chǎng)聲全息中圖分
3、類號(hào):TH701文獻(xiàn)標(biāo)識(shí)碼:A國(guó)家標(biāo)準(zhǔn)學(xué)科分類代碼:140.20Nearfieldacousticholographyformultiplesoundsourcesonirregularstructuresurface11,2SongYulai,HuHongsheng(1.CollegeofMechanicalandElectricalEngineering,JiaxingUniversity,Jiaxing314001,China;2.JiaxingJiajiaAutomobilepartsManufacturingCo.Ltd,Jiaxing31400
4、5,China)Abstract:Inordertoimprovetheholographyaccuracyofmultiplesourcesonirregularstructuresurface,aNearfieldAcousticHolographyformultiplesourcesonirregularstructuresurfaceispresentedbasedonsphericalharmonicwavesuperpositionandsoundsourceidentification.Thepositionsofthesoundsource
5、saredeterminedbythetheoryofsoundsourcedepthidentificationandlocalization,the3Dsoundfielddistributionsaredescribedbysphericalharmonicwavesuperpositionfromdifferentsoundsourceslocation.Thenthesoundfieldsarereconstructedbytheexistingtheoryofsphericalharmonicwavesuperpositionfromthesam
6、epoint.Themethodologyisvalidatedandtheaccuracyofacousticfieldreconstructionisexaminednumericallyinthecrowdedsoundfieldandthediscretesoundfield,respectively,anditiscomparedwiththeexistingmethodwhichdepictsoundfieldwithsphericalwavesfromonelocalcoordinateorigin.Theresultsshowthatwhen
7、thesoundsourcesarecrowdedtogether,theresultsofsoundfieldreconstructionbythetwomethodsareallsatisfiedandthereconstructionerrorislessthan5%.Whenthesoundsourcesarediscrete,theresultoftheexistingmethodisfailed,buttheproposedmethodcangeneratesoundpressuredistributionprecisely,andthereco
8、nstructionerrorisalmostles