測量船水下噪聲預報及減振降噪技術(shù)研究.pdf

1、江蘇科技大學碩士學位論文測量船水下噪聲預報及減振降噪技術(shù)研究姓名：唐曾艷申請學位級別：碩士專業(yè)：輪機工程指導教師：潘朝峰20110316AbstractIIAbstractWiththegrowthindemfmarineresourceswhichusedfoffsheoilmarineenvironmentmarinelifeseabedtopographymeasurementvarioussurveyshipsarepaieds

2、omuchattentionrecentyears.Thevibrationnoiseofthesurveyshipneedstrictcontrolbecauseitneedthehelpofacousticequipmenttodetectmarineresourcesasaresulthigherstardsfthevibrationnoisereductionofshipdesignareproposed.Fhighperfma

3、ncesurveyshipinthedesignstagethepredictionfvibrationnoiseareneededindertoimprovetheshipstructuremakeassessmentdecisionsontheshipvibrationnoisereductiondesign.Asurveyshipwastakenastheresearchobject.Theharmonicresponseanal

4、ysesofitsmainacousticvibrationsourcehadbeentakenoutbymeansoftheFEMsoftware.UnderwateracousticfecastinlowfrequencybwascarriedoutcombinedwithacousticBEMsoftware.Theresearchpredictionofunderwateracousticradiationacteristics

5、inhighfrequencybwereconductedbyusingSEA.Onthisbasisthemethodstocontrolshipstructurevibrationreduceunderwateracousticwereresearchedinaccdancewithengineeringrequirementsthesoftwaresecondarydevelopmenthasbeenmadeontheharmon

6、icresponseanalyses.Thisarticleincludesthefollowingaspects:Firstasurveyshipfiniteelementmodelwasestablishedwiththefiniteelementsoftwaretheinherentacteristicsofthehullwasgotbasedonmodalanalysisthentheharmonicresponseanalys

7、esofitsmainvibrationsourcehadbeentakenoutbymeansoftheFEM.SecondstudyonthedynamicsvibrationunderwatersoundradiationacteristicsontheflowstructureinteractionmodeloftheunderwatershellstructurewithFEMcombinedwithBEMresearchon

8、themethodstoreduceunderwateracoustic.Thirdresearchpredictionofunderwateracousticradiationacteristicsinhighfrequencybwereconductedbyusingstatisticalenergyanalysisonthestatisticalenergymodelofthesurveyship.Fourthbasedonthe