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1、第36卷第1期舰船科学技术Vol.36,No.12014年1月SHIPSCIENCEANDTECHNOLOGYJan.,2014水中有限长圆柱壳体辐射声场特性武国启(大连测控技术研究所,辽宁大连116013)摘要:理论研究有源点激励时水中有限长圆柱壳体辐射声场特性。根据圆柱壳体耦合振动理论,推导有源点激励时水中有限长圆柱壳体振动速度与辐射声压计算式,计算并分析有源点激励时水中有限长圆柱壳体振动速度分布特征、声辐射近场和远场特性。研究结果表明:随着结构阻尼增大,圆柱壳体振动能量与声辐射能量向激励点处集中,且频率越高,这种集中效应越显著。在声辐射
2、近场,声压衰减较快,其分布规律与壳体振动分布规律相近;在声辐射远场,声压衰减规律近似为球面波衰减,声压分布具有一定指向性,且激励力作用方向为声辐射主要方向。关键词:圆柱壳体;辐射声场;有源激励;结构阻尼;集中效应中图分类号:TB532文献标识码:A文章编号:1672-7649(2014)01-0046-06doi:10．3404/j．issn．1672-7649．2014．01．010Researchontheradiatedacousticfieldcharacteristicsofcylindricalshellwithfinitelen
3、gthinwaterWUGuo-qi(DalianScientificTestandControlTechnologyInstitute,Dalian116013,China)Abstract:Theradiatedacousticfieldcharacteristicsofcylindricalshellwithfinitelengthinwaterexcitedbyapointsourcewerestudiedtheoretically.Accordingtothecylindricalshellcoupledvibrationtheor
4、y,theanalyticexpressionsofradiationacousticpressureandvibrationvelocityoffinitecylindricalshellinwaterexcitedbyapointsourceanederived.Basedontheseformulas,thevibrationvelocitydistributionalongwithcylindricalshellandacousticradiationcharacteristicsatnearfieldandfarfieldweres
5、olvedandinvestigated.Theresearchresultsshowthatthevibrationenergyandacousticradiationenergyofcylindricalshellconcentrateontheexcitationpointswiththeincreaseofthestructuraldamping,andthiseffectbecomesstrongerwhenthefrequencyincreases.Inthenearfield,theacousticpressureattenua
6、tesquicklywithapproximatedistributionastheshellvibration.Inthefarfield,theacousticpressureattenuationshowsapproximatesphericalwaveattenuation,andtheacousticpressuredistributionhasacertaindirection,inwhichthemaindirectionofacousticradiationisthesameasthedirectionofexcitation
7、.Keywords:cylindricalshell;radiatedacousticsfield;sourceexcitation;structuraldamping;concentrationeffect构形式,研究其振动与声辐射特性对水下航行器振动0引言噪声测试具有重要实际意义。关于有限长圆柱壳体声[1][2]水中有限长圆柱壳体结构是水下航行器的基本结-振特性研究,Junger系统总结了Stepanishen和收稿日期:2011-09-26;修回日期:2013-02-04基金项目:装备预先研究资助项目(51310040202)作者简介:
8、武国启(1979-),男,博士,工程师,主要从事舰船振动噪声测试分析。第1期武国启:水中有限长圆柱壳体辐射声场特性·47·[3]Sandman等研究成果,根据圆柱壳
