无砟轨动车组运行激励场地振动谱分析
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摘要
为研究CRH2动车组在无砟轨道段运行引起的场地加速度振动的频谱特性,本文对我国首条无砟轨道段(渝遂铁路二岩隧道—湾里头隧道段)动车组运行时的场地振动进行了现场实测;对实测竖向振动加速度时程进行1/3倍频谱分析表明:地面竖向振动加速度随着与振源距离的增大而明显衰减,随车速增大场地振动强度增强;应用正交HHT变换,对加速度时程进行了Hilbert谱分析,获得了地面竖向振动加速度的主频为10~120Hz、振动传播高频成分衰减较快等频谱特性;最后,将Hilbert边际谱与傅里叶谱进行了对比分析,得到了两种方法分析振动信号频谱特性表现出的差异性。
In order to study the frequency spectrum characteristics of the field vibration acceleration induced by impetus locomotive CRH2 operation in the truck on railway without ballast,field vibration measurement was performed on the Suining-Chongqing railway without ballast between Er-Yan Tunnel to Wan-Litou Tunnel.Through one third octave spectrum analysis of vibration acceleration time-history data,it can be sure that ground vibration acceleration obviously decreases with the increase of distance to the central railway line,and the vibration acceleration increases with the train speed increase.Thus,based on the orthogonal Hilhert-Huang transformation(HHT) of the spectrum analysis vibration acceleration time-history,the frequency spectrum characteristics are as follows: the vibration dominant frequency distribution is 10 Hz to 120 Hz;attenuation of high-frequency vibration is faster than that of low-frequency vibration.Then,by the comparative analysis of marginal Hilbert spectrum and Fourier spectrum,the differences of the frequency distributions of the ground vibrations are revealed.
In order to study the frequency spectrum characteristics of the field vibration acceleration induced by impetus locomotive CRH2 operation in the truck on railway without ballast,field vibration measurement was performed on the Suining-Chongqing railway without ballast between Er-Yan Tunnel to Wan-Litou Tunnel.Through one third octave spectrum analysis of vibration acceleration time-history data,it can be sure that ground vibration acceleration obviously decreases with the increase of distance to the central railway line,and the vibration acceleration increases with the train speed increase.Thus,based on the orthogonal Hilhert-Huang transformation(HHT) of the spectrum analysis vibration acceleration time-history,the frequency spectrum characteristics are as follows: the vibration dominant frequency distribution is 10 Hz to 120 Hz;attenuation of high-frequency vibration is faster than that of low-frequency vibration.Then,by the comparative analysis of marginal Hilbert spectrum and Fourier spectrum,the differences of the frequency distributions of the ground vibrations are revealed.
引文
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[2]高广运,李志毅,冯世进,等.秦—沈铁路列车运行引起的地面振动实测与分析[J].岩土力学,2007,28(9):1817-1822.
[3]Xia H,Zhang N,Cao Y M.Experimental study oftrain-induced vibrations of environments and nearbybuildings[J].Journal of Sound and Vibra-tion,2005,280:1017-1025.
[4]Celebi E,Schmid G.Investigation of ground vibrations induced by moving loads[J].Engineering Structures,2005,27:1981-1998.
[5]Degen KG,Behr W,Grutz HP.Investigations and results concerning railway-induced ground-borne vibrations in Germany[J].Journal of Soundand Vibration,2006,293:865-872.
[6]Lomaert Q,Degrande G.Experimental validation of a numerical prediction model for free field traffic induced vibrations by in-situ experiments[J].Soil Dynamics and Earthquake Engineering,2001,21(6):485-497.
[7]夏禾,张楠,曹艳梅.列车对周围地面及建筑物振动影响的试验研究[J].铁道学报,2004,26(4):93-98.
[8]Yang Y B,Hung HH,Chang D W.Train-induced wave propagation in layered soils using finite/infinite element simulation[J].Soil Dynamicsand Earthquake Engineering,2003,23:263-278.
[9]Sheng X,jones J C,Petyt M.Ground vibration generated by a load moving along a railway track[J].Journal of Sound and vibration,1999,228(1):129-156.
[10]Hall L.Simulations of train-induced around vibrations in finite element analyses models[J].Soil Dynamics and EarthquakeEngineering,2003,23:403-413.
[11]Chen Yunmin,Wang Changing,Ji Meixiu,et al.Train-induced ground vibration and deformation.environmental vibration prediction,monitoringand evaluation[M].Beijing:China Communications Press,2003:427-431.
[12]Krylov V V.Ground vibrations boom from high-speed trains.[J].Journal of LowFrequency Noise,Vibration and Active Control,1999,18(4):251-283.
[13]Takemiya H.Field vibration mitigation by honeycomb WIB for pile foundations of a high-speed train viaduct[J].Soil Dynamics and Earth-quake Engineering,2004,24:69-87.
[14]相颖慧.遂渝铁路无砟轨道路涵过渡段性能实车测试及路基结构.FEM分析[D].成都:西南交通大学,2005.
[15]Newland D E.An introduction to random and spectral analysis[M].London:Longman,1975.
[16]陈春俊,李华超.频域采样三角级数法模拟轨道不平顺信号[J].铁道学报,2006,28(3):38-42.
[17]赵林海,赵胜凯,穆建成.利用小波分析技术提取移频信号信息特征[J].铁道学报,2006,28(1):117-120.
[18]钟佑明.希尔伯特-黄变换局瞬信号分析理论的研究[D].重庆:重庆大学,2002.
[19]王伟.Hilbert-Huang变换及其在非平稳信号分析中的应用研究[D].北京:华北电力大学,2008.
[20]武安绪,吴培稚,兰从欣,等.Hilbert-Huang变换与地震信号的时频分析[J].中国地震,2005,21(21):207-215.
[21]李守继,地铁引起环境振动及房屋浮置楼板隔振研究[D].上海:同济大学,2008.
[22]Huang N E,Shen Z,Longsr,et al.The empirical mode decomposition and the Hilbert spectrum for non-linear and non-stationary time series a-nalysis[J].Proceedings of the Royal Society of London,1998,454:903-995.
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