船舶阻抗失配基座对平面弯曲波传递的阻抑特性.pdf

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1、第14卷第6期船舶力学V01．14No·62010年6月JoumalofShipMechanicsJun．2010ArticleID：lOcr7—7294(2010)O鲫678一12AttenuationoftheFlexuralWaVeTransmissionThrOughImpedanceMismatchHullBaseyADX如，lg—Zi∞曙，刀舰(CoⅡege0fshipbuildingEnginee咖g，HarbinEngineeringUniver8ity，Harbin150001，chir岫AbStract：Thech啪ct

2、eristicsofimpedancemisrrIatchhullbase砒tenuatingpropagationofplanebendingwavesareresearchedontllebasisofwavetheory．The80undtransmissioncoe伍cientandtmnsmissionlos80fdif玷rentiunctionbasesincidentbyvibrationwavearededucedaccordingtowavecomre瑙ionandiHlpedance删buteinnon—homogene

3、ousstTuctures，andtheregul觚tyof、ri-bmtionisolationped．o瑚ance埘tlltheb髂eplatesthicknessratioandfbquencyisalso舀Ven．Fllnhemlore，theiIlfluenceofplatesf奴edfomatba8ejunctiontothesoundisolationperfbrm弧ceisdiscussed．AftertlleoreticalaIlalysis，tlIeblockingmassesareintroducedtoimpedan

4、cemismatchofhuUb鹪e．nlenumericalcalculationresultsshowtllattllevibrationisolationperfomanceofimpedance血smatchhuUb嬲eisincreasednotablybecausetheimpedancemismatchbaseen—h觚ce8tlleinputmechanic8lre8istanceofb嬲estmcture．Impedancemismatchbase8lsoaggm-vates、rib豫tionwaveconve璐ion，s

5、catteringandrenectioninhullplates．KeywOrds：impedan∞mismatchb蹴；、忱VetlI∞ry；waVecOnVersiOn；鲫岫dtra皿滩iSSiOnd'eI强cient；∞undisolati仰perfb珊an∞CLC咖ber：0351．2Doc唧entcode：A1hltroductionMutation(m硒s，stif．fness，etc．)ofsteadystmcturewiUcauseimpedance111is眦tchofthestmcture，anditi8alsoof8

6、ignificanceintherenectionofsoundwaves．Shipbasecon8istsofv眦ical觚dhorizontalframesandplates，锄dthestmcture—bomeso叽d访Uencounternatl卜mlb删ers诵thisolationrolewhentransmittingalongshipbase，such鹪hingedsupportsofplatesorrods，theiointsandtlIestifbnersofthestmcture，andt}lesebarrierspl

7、ayaroleinthei80lationofthetransmis8ionofthesound【11．F0rthesteelvessel，inthe8itef南mthesoundsourcecenter5～10m，thestmcture-bomesoundattenuatesby1dB／minthegeneralwaveb锄d，butinal蝴erextent，tIlevaluef砒lstoO．5dB／m闭．Ifsomevibration—reductionmeasu陀saretakenbe“佗entllehuUandthebase．th

8、eattenuationc锄beraisedtomorethan2dB／m．Hingedsupportsofplatesorrods，thejoints锄dthestif亿ner