磁浮道岔梁自振特性及瞬态响应分析
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摘要
建立了磁浮道岔五跨钢结构连续梁的梁单元和板单元有限元模型,分析了道岔梁的自振特性,计算了磁浮道岔梁的瞬态响应。模态分析表明道岔梁板单元模型的前5阶扭转频率在14.2Hz至16.1Hz之间,与其现场实测值14.9Hz极为接近,道岔梁梁单元模型的扭转频率计算值明显高于实测值,道岔梁板单元模型能更为准确的反映其振动特性。瞬态响应分析表明磁浮车辆通过时道岔梁第三跨跨中挠度最大,车速240km/h时其最大值约为1.29mm。
Two finite element models for a five-span steel beam of maglev switch were established by adopting the beam element and the plate element respectively.Then,the natural vibration and transient response of the switch beam were analyzed.Mode analysis showed that the first five torsional frequencies of the plate element model range from 14.2 Hz to 16.1 Hz,which is very close to the test value 14.9 Hz.The calculated torsional frequencies of the beam element model are much larger than the test value.So it is concluded that the plate element model can more precisely reflect the vibration characteristics of the maglev switch beam.Furthermore,the transient results showed that the maximum vertical deflection appeared at the mid-span of the third span beam when maglev vehicle passed through maglev switch,which reached 1.29 mm at a running speed of 240km/h.
Two finite element models for a five-span steel beam of maglev switch were established by adopting the beam element and the plate element respectively.Then,the natural vibration and transient response of the switch beam were analyzed.Mode analysis showed that the first five torsional frequencies of the plate element model range from 14.2 Hz to 16.1 Hz,which is very close to the test value 14.9 Hz.The calculated torsional frequencies of the beam element model are much larger than the test value.So it is concluded that the plate element model can more precisely reflect the vibration characteristics of the maglev switch beam.Furthermore,the transient results showed that the maximum vertical deflection appeared at the mid-span of the third span beam when maglev vehicle passed through maglev switch,which reached 1.29 mm at a running speed of 240km/h.
引文
[1]吴祥明.磁浮列车[M].上海:上海科学技术出版社,2003.
[2]Fichtner K.,Pichlmeier F.The transrapid guideway switch-test and verification[C].In:MAGLEV’2004Proceedings.Shanghai,China,2004:624-631.
[3]Dignath F.,Liu X.F.,Zheng Q.H.Dynamic behavior of guideway switch beams[C].In:MAGLEV’2006Proceedings.Dresden,Germany,2006.
[4]洪芳鹏,卜昌富,黄醒春.车载作用下箱形截面梁振动特性的瞬态动力学分析[J].地震工程与工程振动,2004,24(6):53-57.
[5]殷月俊,罗汉中,黄醒春.高速磁浮道岔振动响应的原位实测[J].上海交通大学学报,2007,41(4):658-663.
[6]黄醒春,卜昌富,滕念管.正交循环荷载作用下超大型钢梁疲劳特性的建模与分析[C].见:首届长三角科技论坛——城市发展与建设文集.杭州,2004:215-221.
[7]赵春发,翟婉明,叶学艳.高速磁浮车辆弹性悬浮架动力学建模与仿真[J].系统仿真学报,2008,20(20):5718-5721.
[8]赵春发,翟婉明.磁浮车辆/轨道系统动力学(II)——建模与仿真[J].机械工程学报,2005,41(8):163-175.
[9]翟婉明著.车辆—轨道耦合动力学(第三版)[M].北京:科学出版社,2007.
[2]Fichtner K.,Pichlmeier F.The transrapid guideway switch-test and verification[C].In:MAGLEV’2004Proceedings.Shanghai,China,2004:624-631.
[3]Dignath F.,Liu X.F.,Zheng Q.H.Dynamic behavior of guideway switch beams[C].In:MAGLEV’2006Proceedings.Dresden,Germany,2006.
[4]洪芳鹏,卜昌富,黄醒春.车载作用下箱形截面梁振动特性的瞬态动力学分析[J].地震工程与工程振动,2004,24(6):53-57.
[5]殷月俊,罗汉中,黄醒春.高速磁浮道岔振动响应的原位实测[J].上海交通大学学报,2007,41(4):658-663.
[6]黄醒春,卜昌富,滕念管.正交循环荷载作用下超大型钢梁疲劳特性的建模与分析[C].见:首届长三角科技论坛——城市发展与建设文集.杭州,2004:215-221.
[7]赵春发,翟婉明,叶学艳.高速磁浮车辆弹性悬浮架动力学建模与仿真[J].系统仿真学报,2008,20(20):5718-5721.
[8]赵春发,翟婉明.磁浮车辆/轨道系统动力学(II)——建模与仿真[J].机械工程学报,2005,41(8):163-175.
[9]翟婉明著.车辆—轨道耦合动力学(第三版)[M].北京:科学出版社,2007.
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