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ID:34094746
大小:6.09 MB
页数:42页
时间:2019-03-03
《64阵元相控换能器声压场的数值仿真分析》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、万方数据天津医科大学硕士学位论文ofthecontentsandresultsareasfollows。Results1.Inthewaterwhenthefrequencyis0.5-0.8MHz.thegreaterthe矗equency,thegreaterthefocuspressureandsidelobe,theclosertothefocalpositionofthetransducer.2.Whensettingthefocusonthesoundaxis,thefocuspressureperformedbytheunequaldistanceringtransd
2、ucersislessthantheequaldistanceringtransducers,andwhenthefocallengthisgreaterthanthegeometricfocallength,theratioofintensityofsidelobesandmainloberatiooftheunequaldistancering廿ansducersisO.46.exceedingthesafetythresholdofO.25.3.Whenthe仃asducer’Sdiameteris8mm,thedistanceofadjacentringis7mm,ther
3、atioofsidelobesandmainlobeiSlessthanthetransducerwhichdistanceof撕acentringis7mm.Whenthetrasducer’Sdistanceof删acentringis7mm,diameteris8.5mm,theratioofsidelobesandmainlobeislessthanthetransducerwhichdiameteris8mmandthefocuspressureisgreaterthanit.4.Simulatingthesoundpressurefieldoftheequaldista
4、ncetransducerwhichdiameteris8.5mm,distancedistanceofadjacentringis7mm.(1)T11ephasedarrayfocusedonthetargetfocusalongaxisandoff-axis.Andwhenfocallengthofthesettingfocusalongaxisismorethan80mm,thepressureofthefocusdeceased,sidelobesincreased.(2)Wi也thesettingfocallengthincreasing,theratioofsidelo
5、besandmainlobedecreasedfirstlyandthenincreased,thepressureoffocusincreasedfirstlyandthendecreased.nefartherthesoundaxisdeviation,theshortertherangeofthefocallengthofthesidelobes\6、delobesincreasesandthendecreases.Whenthelengthoftwofociisform3mmto2.5mm,twofocigraduallymixestogether.(4)Whenfocusingonfivefoci,itcanformregiononthetargetfocus,andtherewillbethefocalregionformedbetweenthesidelobes.ConclusionIV万方数据天津医科大学硕士学位论文1.Thefocuspressure.sidelobeamplitudeandthesizeofthef7、ocalregionwillbeaffectedbyfrequency.2.Theperformanceofequaldistributionphasedarrayelememtransducerisbeaerthantheunequaldistributiontransucer.3.EqualdistributiontransducerarrayCanfocusincertainrange.Whenthetargetfocusisfarawayfromtheposi
6、delobesincreasesandthendecreases.Whenthelengthoftwofociisform3mmto2.5mm,twofocigraduallymixestogether.(4)Whenfocusingonfivefoci,itcanformregiononthetargetfocus,andtherewillbethefocalregionformedbetweenthesidelobes.ConclusionIV万方数据天津医科大学硕士学位论文1.Thefocuspressure.sidelobeamplitudeandthesizeofthef
7、ocalregionwillbeaffectedbyfrequency.2.Theperformanceofequaldistributionphasedarrayelememtransducerisbeaerthantheunequaldistributiontransucer.3.EqualdistributiontransducerarrayCanfocusincertainrange.Whenthetargetfocusisfarawayfromtheposi
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