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1、華中科技大學(xué)碩士學(xué)位論文摘要隨著汽車排放法規(guī)的日益嚴(yán)格，汽車尾氣氧傳感器的應(yīng)用和開(kāi)發(fā)工作越來(lái)越迫切。數(shù)值模擬技術(shù)的應(yīng)用有效地推動(dòng)了這一過(guò)程的進(jìn)展。本論文基于有限元模擬軟件ANSYS平臺(tái)，對(duì)氧傳感器的溫度場(chǎng)和應(yīng)力場(chǎng)進(jìn)行了模擬，論文的完成可為氧傳感器的設(shè)計(jì)提供有效的依據(jù)。論文針對(duì)套管式氧傳感器的具體情況，建立了軸對(duì)稱模型，根據(jù)裝配要求，得到了相應(yīng)的位移約束和壓力載荷。通過(guò)實(shí)驗(yàn)對(duì)內(nèi)置發(fā)熱器的加熱狀況進(jìn)行了測(cè)定，得到了氧傳感器冷啟動(dòng)時(shí)陶瓷件內(nèi)部的溫度載荷情況，從而建立了完整的有限元分析模型，減少了計(jì)算量，又不影響計(jì)算結(jié)果的精度。對(duì)套管式氧傳感器的溫度場(chǎng)和應(yīng)力場(chǎng)進(jìn)行了動(dòng)
2、態(tài)模擬，得到了不同時(shí)刻的溫度場(chǎng)和應(yīng)力場(chǎng)的變化情況。再現(xiàn)了氧傳感器在不同工作環(huán)境下的應(yīng)力情況。結(jié)果表明在固定的結(jié)構(gòu)尺寸情況下，外界溫度載荷的變化對(duì)最大應(yīng)力沒(méi)有影響。通過(guò)對(duì)不同結(jié)構(gòu)尺寸套管式氧傳感器的應(yīng)力場(chǎng)分析，得出了相應(yīng)結(jié)構(gòu)尺寸與應(yīng)力之間的關(guān)系,為結(jié)構(gòu)優(yōu)化提供了依據(jù)。對(duì)平板式氧傳感器的溫度場(chǎng)和應(yīng)力場(chǎng)進(jìn)行了模擬。溫度場(chǎng)的結(jié)果顯示，鋯板在10s左右前端溫度就可以達(dá)到均勻，并且厚度方向表現(xiàn)出了很好的溫度一致性；從應(yīng)力場(chǎng)的結(jié)果顯示，應(yīng)力的較大值發(fā)生在固定位移與自由端的交界部分。并對(duì)平板式氧傳感器的印制和裝配給出了指導(dǎo)性建議。關(guān)鍵詞：氧傳感器有限元分析溫度場(chǎng)應(yīng)力場(chǎng)ANSY
3、SI華中科技大學(xué)碩士學(xué)位論文AbstractWiththemoreandmoreseriousemissionregulations,thedevelopmentoftheexhaustoxygensensorshasbecomeincreasinghot.Finiteelementanalysishasbeenusedsuccessfullyinthisfield.Inthispaper,thetemperaturefieldandthestressfieldoftheoxygensensorhasbeensimulatedbasedonANSYSplatf
4、orm.Someeffectiveprinciplesareprovidedforthedesignofoxygensensor.Theaxisymmetricalmodelisestablishedformeetingthespecificconditionsofthethimble-typesensor,andthecorrespondingdisplacementconstraintandpressureloadaregotaccordingtothematchingrequirements.Theheatingrateoftheheaterhasbee
5、ntestedbyexperiment,andthenthetemperatureloadhasbeensetup.Theintegratedcomputermodelforthermalanalysisofthethimble-typesensorhasbeensetup,whichreducesthecomputationaleffortswhilekeepingtheaccuracy.Thefiniteelementanalysisoftemperaturefieldsandstressfieldsofthethimble-typeoxygensenso
6、risaccomplished,andthispaperanalyzeshowtemperaturefieldsandstressfieldsdistributeinthedifferenttime.Analysisofstressfieldsofthethimble-typeoxygensensorindifferentenvironmentshasbeendone,andmaximumstressisalmostthesame.Therelationshipofthestructurefeaturedimensionandthestressisfounde
7、d,whichcanassistpeopletodesignabettersensorstructure.Thetemperaturefieldsandstressfieldsoftheplanar-typeoxygensensorissimulated.Theresultofthetemperaturefieldsshowsthatthetemperaturebecomesuniformonthetopoftheplanar-typesensorin10secondswhileitalsoshowsgoodtemperaturehomogeneityinth
8、ethicknessdirection
