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1、第24卷第2期水動(dòng)力學(xué)研究與進(jìn)展Vo1.24.No.22009年3月CHINESEJOURNALOFHYDRODYNAMICSMar..2O09文童■號(hào)ll000—4874f20o91一O2—0180一lO低水動(dòng)力白噪聲的頭體線型優(yōu)化設(shè)計(jì)方法米唐科范,柳康寧(上海交通大學(xué)工程力學(xué)系,上海2o0240,Email:kftang@sjtu.edu.cn)摘要:本文闡述了一套低水動(dòng)力自噪聲的頭體線型優(yōu)化設(shè)計(jì)方法,即通過(guò)優(yōu)化設(shè)計(jì)水下航行體的頭部線型,在保證無(wú)空化航行的前提下,降低頭體邊界層流動(dòng)對(duì)其前駐點(diǎn)位置的水動(dòng)力自噪聲干擾。這種頭體線型優(yōu)化設(shè)計(jì)方法,首先利用自噪聲頻譜的相似規(guī)律,結(jié)合已有
2、理論分析和實(shí)驗(yàn)測(cè)試結(jié)果對(duì)軸對(duì)稱(chēng)回轉(zhuǎn)體的水動(dòng)力自噪聲頻譜進(jìn)行數(shù)值預(yù)報(bào);然后以該自噪聲聲壓譜級(jí)為目標(biāo)函數(shù),結(jié)合工程實(shí)際中的約束條件,進(jìn)行頭體幾何參數(shù)的多參數(shù)尋優(yōu)。這種優(yōu)化設(shè)計(jì)方法能以較小的計(jì)算量獲得較高精度的關(guān)鍵頻率處的自噪聲聲壓譜級(jí)預(yù)報(bào)和相應(yīng)的低噪聲頭體線型優(yōu)化設(shè)計(jì),從而具備廣泛工程應(yīng)用的可行性。本文中所列的典型算例顯示,經(jīng)過(guò)線型優(yōu)化設(shè)計(jì)的頭型具有比原型顯著降低的自噪聲。關(guān)鍵詞t水動(dòng)力噪聲;自噪聲;頭體線型;優(yōu)化設(shè)計(jì)中圈分類(lèi)號(hào):u661.1,O427.5文獻(xiàn)標(biāo)識(shí)碼:AAppr0achesf0r0ptimizeddesign0ftheheadfl0mwithl0whydI.0-dyna
3、micalself_n0iseTANGKe—fan,LIUKang—ning(D印artmemofEngineeringMechanics,ShaIlghaiJiaoTbngUniVersity,Shanghai2OO24O,CIlina)Abstract:Asetof印pmachesfl0roptimizgmedesignofmeheadf0珊withlowhydm—dynamica1noiseisdescedinthispaper.nistoreducetlleself_n0isegeneratedbyitsbOundarylayeratⅡlestagnationposm0no
4、ftl1eheadfbminnoncavitatingnow.rI11isoptimizationmemodisflrsnyt0numericallypr酣ictmehydro—dynaInicalself_noisespectnmlontl1ea)【isyI砌etricbodies,byusmes砌larity1awofmeself_n0isespec鋤maIldsomeomerⅡle0retica1aJldexperimentalresults.ThenitputsfbnvardamuparalTleter叩timizatiOnOfgeOmetricparametersOfⅡl
5、eheadfb珊,cOnside血gⅡlesoundpressurespecⅡleve1ofmeself-noiseasmeobjectivefunctionundertlleconsntconditions仃ommeengineeringpractice.Itisshown
6、;收藕日期I2008.10—17(2009.01.12修改藕)基金項(xiàng)目:上海市重點(diǎn)學(xué)科建設(shè)項(xiàng)目資助,項(xiàng)目編號(hào):B2O6作者簡(jiǎn)介。唐科范(1964一),男,江蘇無(wú)錫人,講師,工學(xué)博士唐科范,等:低水動(dòng)力自噪聲的關(guān)體線型優(yōu)化設(shè)計(jì)方法181mattl1edesbedmethodisfeasiblef0rawidel
7、yengapplicati0nbecauseofifssmallcomputa曲nalc0standquiteaccuratepredictionofs0undpressurespec砌leVeloftheself.n0iseattllelreyfequency.FmmttletypicalexaI】1plesinmispaper,itshowsmattt1eself_noise0n吐le叩血mzedheadf0nnsisdbvi0uslylowerⅡlanmatflr0mⅡ1eiIlitialshapesKeywOrds:hydm—dynanlica1noise;seIf_n0i
8、se;f0re—hDdyshape;op血mlmdesigrI)73=寺(小K()(1)1前言式中:是平端面和過(guò)渡曲線連接處過(guò)渡曲線的曲率變化率,是過(guò)渡曲線和平行中體連接處過(guò)所謂頭體水動(dòng)力自噪聲是指,頭體在水中高速航行時(shí),由頭體周?chē)畡?dòng)力原因引起的對(duì)位于頭端渡曲線的曲率變化率,并且:部處聲納陣的的噪聲干擾。自噪聲和輻射噪聲的區(qū)別在于,輻射噪聲是在遠(yuǎn)處測(cè)得的噪聲,而自噪聲()=6(一1),()=()。,是在近場(chǎng)的頭體前駐點(diǎn)附近測(cè)得的噪聲。由于頭體邊界層緊挨著前駐點(diǎn),這就