欢迎来到天天文库
浏览记录
ID:53573262
大小:358.34 KB
页数:5页
时间:2020-04-19
《钢轨吸振器对高架结构垂向振动的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第34卷第4期噪声与振动控制Vol34NO.42014年8月N0ISEANDVIBRAT10NCONTROLAug.2014文章编号:1006—1355(2014)04.0214—05钢轨吸振器对高架结构垂向振动的影响杨建近,杨新文(1.兰州交通大学机电工程学院,兰州730070;2.同济大学交通运输工程学院,上海20l804)摘要:建立带有钢轨吸振器的高速铁路高架结构板式轨道与桥梁垂向耦合振动模型,分析钢轨吸振器对轨道和桥梁结构垂向振动的影响。模型己考虑了钢轨吸振器、板式轨道结构及桥梁间的耦合作用。钢
2、轨吸振器被视为两自由度的质量一弹簧系统,钢轨、轨道板和桥梁被视为多层叠合梁模型,彼此用弹簧阻尼元件联接。利用动柔度函数,得到吸振器一板式轨道一桥梁系统垂向振动响应的解析表达式,并以轮轨表面粗糙度谱作为激励求解模型的振动响应。研究结果表明:钢轨吸振器在180Hz~300Hz及700Hz~1000Hz频段内对整个高架轨道系统的位移幅值及相位、振动衰减产生较明显的影响;同时,在轮轨表面粗糙度谱的激励下,带有钢轨吸振器的轮轨系统的轮轨力在pinned.pinned频率处明显减小,在前两阶自振主频附近钢轨吸振器对
3、整个高架轨道系统结构振动的影响较明显。关键词:振动与波;高速铁路;高架结构;钢轨吸振器;耦合振动;动柔度中图分类号:TB53;U211.5;U213文献标识码:ADOI编码:10.3969/j.issn.10061335.2014.04.047E舵ctofRai1VlibrationAbsorbersonVerticalVibrationofElevatedStructuresYANGJian—fin.YANGXin。Well(1.SchoolofMechatronicEngineering,Lanzh
4、ouJiaotongUniversity,Lanzhou730070,China;2.SchoolofTransportationEngineering,TongjiUniversity,Shanghai201804,China)Ab~a-act:Thefrequency-domainanalysismodelwitharailvibrationabsorberisestablishedforanalyzingtheelevatedslab—trackandtrack-bridgecoupledvert
5、icalvibration.Theefectoftherailvibrationabsorberontheverticalvibrationsofelevatedrailwayandbridgeisanalyzed.Thecouplingefectoftheabsorber,rail,slabtrackandelevatedbridgeisconsidered.Theabsorberismodeledtobeamass—springsystemwithtwodegreesoffreedom.Therai
6、l,slabtrackandelevatedbridgearerespectivelyconsideredasaninfinitelylongTimoshenkobeam,anend-freeEulerbeamandasimplysupportedEulerbeam,andtheyareconnectedoneanotherwithspringanddampingelements.Theverticalvibrationsofthesystemaresolvedbydynamicflexibilityf
7、unctions.Theefectoftheabsorberontheverticalvibrationoftheelevatedrailwayisanalyzed,andthevibrationsoftheelevatedrailwaystructuresexcitedbythewheel—railroughnessspectraareobtained.Theresultsshowthat,theabsorberhasasignificantefectonthevibrationdecayanddis
8、placementamplitudeandphaseofthewholestructuresoftheelevatedrailwayinthefrequencyrangesof180Hz~300Hzand700Hz~1000Hz.Undertheexcitationofwheel/railroughnessspectra,theabsorberCanreducethewheel/railforceobviouslyatthe“pined—p
此文档下载收益归作者所有