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1、第34卷第4期噪聲與振動(dòng)控制Vol34NO.42014年8月N0ISEANDVIBRATIoNC0NTROLAug.2014文章編號(hào):1006.1355(2014)04.0071—06流體載荷對(duì)水下自由阻尼板阻尼損耗因子的影響尹幫輝,王敏慶(西北工業(yè)大學(xué)航海學(xué)院,西安710072)摘要:結(jié)構(gòu)的阻尼損耗因子是潛艇降低水下輻射噪聲的重要參數(shù)。為此,采用譜有限元法以計(jì)算流體載荷作用下的自由阻尼板的結(jié)構(gòu)損耗因子,探討輻射損耗因子同功率轉(zhuǎn)換系數(shù)間的關(guān)系;然后使用譜有限元法比較了含流體和不含流體的自由阻尼板的結(jié)構(gòu)損耗因子的差異,使用能量法對(duì)相關(guān)計(jì)算結(jié)果進(jìn)行驗(yàn)證;最
2、后使用三維模型對(duì)流體載荷作用下的自由阻尼板的功率轉(zhuǎn)換系數(shù)進(jìn)行了計(jì)算,進(jìn)而分析功率轉(zhuǎn)換系數(shù)同阻尼層楊氏模量、阻尼層厚度、阻尼層材料損耗因子等參數(shù)的關(guān)系。研究發(fā)現(xiàn):在低于第二階彎曲波產(chǎn)生頻率的頻段范圍內(nèi),無流體時(shí)的損耗因子小于有流體的自由阻尼板;從頻段平均的角度來看,功率轉(zhuǎn)換系數(shù)在低頻存在較大峰值,在高頻變化較為平緩且數(shù)值較?。粚?shí)際潛艇在流體載荷下主要通過改變結(jié)構(gòu)的阻尼來改變其輻射的阻尼損耗因子。分析結(jié)果對(duì)于潛艇結(jié)構(gòu)阻尼的優(yōu)化設(shè)計(jì)有參考價(jià)值。關(guān)鍵詞:振動(dòng)與波;流體載荷;自由阻尼板;阻尼損耗因子;譜有限元法;三維彈性理論中圖分類號(hào):TB53;0328;TH1
3、13文獻(xiàn)標(biāo)識(shí)碼:ADOI編碼:10.3969/j.issn.1006.1335.2014.04.016InfluenceofFluidLoadingontheDampingLossFactorofUnderwaterUnconstrainedDampingPlatesY/NBang-hui,WANGMin—qing(SchoolofMarineEngineering,NorthwestemPolytechnicUniversity,Xi’an710072,China)AbOrter:SpectralfiniteelementmethodiSdevelo
4、pedforcalculatingthestructurallOSSfactorofanunconstraineddampingplatewiththefluidloadingconsidered.Therelationshipbetweentheradiationlossfactorandpowerconversioncoeficientisanalyzed.Then,thestructurallossfactoroftheunconstraineddampingplateconsideringthefluidloadingiscomparedwit
5、hthatoftheplatewithoutconsideringthefluidloading.Theresultsareverifiedbyusingtheenergymethod.Finally,thepowerconversioncoeficientoftheunderwaterunconstraineddampingplateiscalculatedusingthree—dimensionalelasticmode1.Variationlawofthepowerconversioncoeficientwiththevariationsofth
6、eYoungSmodulus,thicknessandthemateriallossfactorofthedampinglayerisdiscussed.Thestudyshowsthatwithinthefrequencybandbelowthesecond—orderbendingwave’Sstartingfrequency,thestructurelossfactoroftheunconstraineddampingplatewithoutfluidloadingislessthanthatwithfluidloading.Fromtheper
7、spectiveofthefrequencyaverage,thepowerconversioncoeficienthaslargepeaksinthelowfrequencyrange,anditvariesgentlyandhassmallvaluesinthehigh-frequencyband.TheradiationdampinglossfactoroftheactualsubmarinesunderthefluidloadingcanbechangedbychangingthestructurelossfactorResultsofthes
8、tudymayhavesomereferencevaluesfortheoptimaldesi