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ID:52012677
大小:2.12 MB
页数:7页
时间:2020-03-21
《运动边界相似法及船舶结构动力分析应用.pdf》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、振动与冲击第33卷第20期JOURNALOFVIBRATIONANDSHOCKV0l_33No.202014运动边界相似法及船舶结构动力分析应用刘峰,庞福振,韩端锋,缪旭弘(1.哈尔滨工程大学船舶工程学院,哈尔滨150001;2.中国人民解放军92857部队,北京100007)摘要:基于结构动力分析原理,以“设备一基座”振动系统为例,证明结构动力分析时力边界与运动边界的统一性;针对结构局部动力参数未知情况,通过保障结构运动边界条件一致,构造结构动力分析“虚拟力”,提出结构动力分析的运动边界相似法,解决动力参
2、数未知时给定运动边界条件的结构动力分析问题,并对其有效性进行验证;将运动边界相似法用于船舶结构水下振动声辐射研究,分析船舶水下声辐射特性。结果表明,船舶水下振动声辐射与激励作用位置、激励频率等因素密切相关。船舶结构水下辐射噪声主要集中于激励源附近的中部区域,尾部次之,船首最小;低频段船舶水下声辐射沿船长分布均匀,但随激励频率的提高,水下辐射声场不均匀性逐渐增大,指向性更明显。关键词:结构动力分析;边界条件;运动边界相似法;船舶;水下辐射噪声中图分类号:U661.44文献标志码:ADOI:10.13465/j
3、.cnki.jVS.2014.20.022MovingboundarysimilaritymethodanditsapplicationinshipstructuraldynamicsanalysisLIUFeng,PANGFu—zhen,HANDuan-feng,MIAOXu—hong(1.CollegeofShipbuildingEngineering,HarbinEngineeringUniversity,Harbin150001,China;2.92857ArmyofPLA,Beijing10000
4、7,China)Abstract:Basedontheprincipleofstructuraldynamicsanalysis,theunitarityofforceboundariesandmovingboundarieswasprovedbyusingthe“equipment—base”vibrationsystemasanexample.Byconstructing“virtualforce’’tokeeptheconsistencybetweenmovingboundariesofstructu
5、reandlocallyunknowndynamicparameters,amethodofmovingboundarysimilarity(MBSM)wasproposedtosolvethedynamicspredictionproblemofastructurewithgivenmovingboundaryconditionsandstructurallocallyunknowndynamicparameters.TheeffectivenessofMBSMwasalsoverified.Onthis
6、basis,theMBSMisappliedtotheresearchofshipstructuralunderwatervibrationandnoiseradiation.Theunderwaternoiseradiationcharacteristicofashipwasanalyzed.Theresultshowthattheunderwatervibrationandsoundradiationoftheshiparehighlyrelatedwiththelocationand~equencyo
7、fexcitationsandotherfactors.Theshipstructuralbornenoiseradiationismainlyconcentratedinthevicinityofexcitationsourceinthemiddleregionofshiphul1.Theradiationinthe觚regionofshiphullbecomesminorandrechestheminiumintheregionofshipbow.Theunderwaternoiseradiationi
8、smoreuniformlydistributedalongtheshiplengthinlow~equencyband;however,theinhomogeneityanddirectivityoftheunderwaternoiseradiationgraduallyincreaseastheexcitation~equencyincreases.Keywords:structuraldynamicsana
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