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1、第35卷第3期噪聲與振動(dòng)控制V_0l35NO.32015年6月NOISEANDVIBRrIONCoNTR0LJun.20t5文章編號(hào):1006—1355(2015)03-0037—04+66基于MATV的高速列車車體鋁型材振動(dòng)聲輻射預(yù)測(cè)姚丹,伏蓉,肖新標(biāo),周強(qiáng),王衡禹,圣小珍(1.西南交通大學(xué)牽引動(dòng)力國(guó)家重點(diǎn)實(shí)驗(yàn)室,成都610031;2.西南交通大學(xué)材料先進(jìn)技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室,成都610031摘要:運(yùn)用模態(tài)聲傳遞向量(MATv)方法預(yù)測(cè)現(xiàn)有高速列車車體鋁型材在白噪聲激勵(lì)下的振動(dòng)聲輻射特性,分別對(duì)比阻尼損耗因子和鋁型材結(jié)構(gòu)截面三角形傾角對(duì)其振動(dòng)聲輻射的影響。結(jié)果顯示現(xiàn)有
2、高速列車車體鋁型材結(jié)構(gòu)在較寬頻帶范圍內(nèi)的聲輻射效率隨頻率的提高整體呈上升趨勢(shì),最后基本趨近于1。240Hz以下聲輻射效率曲線呈近似線性遞增的關(guān)系,240Hz以上聲輻射效率由于高階模態(tài)的影響處于波動(dòng)狀態(tài)。鋁型材阻尼損耗因子的增加可以減少鋁型材結(jié)構(gòu)向外輻射的噪聲,阻尼損耗因子從0增加到1%,總聲功率級(jí)急劇降低了約33.5dB,隨著阻尼損耗因子從3%增加到7%,總聲功率級(jí)近似線性減小且降低速度放緩。鋁型材截面三角形傾角越小,鋁型材結(jié)構(gòu)的聲輻射效率越小,其輻射噪聲的能力越弱,傾角從60。變化到3O。,總聲功率級(jí)降低了約27.9dB。關(guān)鍵詞:振動(dòng)與波;高速列車;鋁型材;聲輻射;阻
3、尼損耗因子中圖分類號(hào):0422.6;TB532文獻(xiàn)標(biāo)識(shí)碼:ADOI編碼:10.3969/j.issn.1006.1335.2015.03.009SoundRadiationPredictionofSectionAluminumforHigh--speedTrainsBasqe,~do0nMATl。VMethodYAODan2JFURong,XIAOXin—biao,ZHOUQiang,WANGHeng-yu,SHENGXiao-zhen(1.StateKeyLaboratoryofTractionPower,SouthwestJiaotongUniversity,Che
4、ngdu610031,China;2.KeVLaboratoryofAdvancedTechnologiesofMaterials,MinistryofEducation,SouthwestJiaotongUniversity,Chengdu610031。China1Abstract:nlesoundradiationcharacteristiesofsectionaluminumofhigh—speedtrainswereanalyzedunderawhitenoiseexcitationusingasoundradiationpredictionmodalbased
5、onthemodalacoustictransfervector(MATV、method.Theefectsofdampinglossfactorandinclinationangleoftheinteriorreinforcingribsofthesectionaluminumonthesoundradiationpropertieswereanalyzed.Itisfoundthatforthecurrentlyusedsectionaluminumstructureinhigh-speedtrainbodies,itssoundradiationeficiency
6、increaseswithfrequencyincreasingandfmallyapproaches1.Tl1esoundradiationeficiencyincreaseslinearlyforthefrequenciesbelow240Hz.a(chǎn)ndfluctuatesabove240Hz.Increasingdampinglossfactorcanresultinadecreaseofthenoiseradiatedfromthesectionaluminumstructure.W.henthedampinglossfactorincreasesfrom0to1
7、%.theoverallsoundpowerleveldrasticallyreducesbynearly33.5dB.Whenthedampinglossfactorincreasesfrom3%to7%.theoverallsoundpowerleveldecreasesslowlyandalmostlinearly.ItiSalsofoundthat.thesmallertheinclinationangleoftheinteriorreinforceribsiS.thelowerthesoundradiationeficiency