利用Periodic Fourier法研究橡胶混凝土隔振基础对轨道振动的影响
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摘要
地下铁道轨道减振措施研究是一个受到持续关注的问题,本文创新性地引入橡胶混凝土隔振基础这一概念。并利用Peiodic-Fourier方法,探讨了橡胶混凝土隔振基础物理参数对钢轨振动位移的影响。研究结果表明:(1)高频激励荷载引起的钢轨位移比低频激励荷载引起的钢轨位移小;(2)橡胶混凝土隔振基础刚度越大,相应的共振频率越大,但引起的钢轨振动位移越小;(3)橡胶混凝土隔振基础阻尼越大,相应的共振频率越小,且引起的钢轨振动位移也越小。
A novel type of a crumb rubber concrete(CRC)foundation was proposed for vibration reduction of railway tracks of subways. The Periodic-Fourier method was adopted to build the mathematical model and analyze the influence of different physical parameters of the CRC foundation on the vibration displacement of the rails. The results show that in comparison with the conventional foundations, the rail displacement induced by high-frequency excitation is greatly reduced,and the rail displacement induced by high-frequency excitation is smaller than that by low-frequency excitation; the larger stiffness of the CRC foundation can lead to larger resonant frequency and smaller vibration displacement of the rails; increasing the damping of the CRC foundation can reduce the resonant frequency and the vibration displacement of the rails.
A novel type of a crumb rubber concrete(CRC)foundation was proposed for vibration reduction of railway tracks of subways. The Periodic-Fourier method was adopted to build the mathematical model and analyze the influence of different physical parameters of the CRC foundation on the vibration displacement of the rails. The results show that in comparison with the conventional foundations, the rail displacement induced by high-frequency excitation is greatly reduced,and the rail displacement induced by high-frequency excitation is smaller than that by low-frequency excitation; the larger stiffness of the CRC foundation can lead to larger resonant frequency and smaller vibration displacement of the rails; increasing the damping of the CRC foundation can reduce the resonant frequency and the vibration displacement of the rails.
引文
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[5]黄凯,白鸿柏,路纯红,等.应用复合减振器的梯形轨枕提高轨道的减振效果[J].噪声与振动控制噪声与振动控制,2013,33(5):161-165.
[6]金浩.基于改进蚁群算法梯式轨道及橡胶混凝土隔振基础优化研究[D].北京:北京交通大学,2013.
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[11]Hussein M,Hunt H.Modelling of floating-slab track with discontinuous slab Part 2:response to moving trains[J].Low Frequency Noise,Vibration and Active Control,2006,25(2):111-118.
[12]Hussein M,Hunt H.Modelling of Floating-Slab Track with Discontinuous Slab Part 1:Response to Oscillating Moving Loads[J].Low Frequency Noise,Vibration and Active Control,2006,25(1):23-39.
[13]贾颖绚.基于解析的车轨耦合模型及地铁对环境的振动影响研究[D].北京:北京交通大学,2009.
[2]刘维宁,任静,刘卫丰,等.北京地铁钢轨波磨测试分析[J].都市快轨交通都市快轨交通,2011,24(3):6-9.
[3]金浩,刘维宁.蚁群算法耦合LS-DYNA梯式轨枕轨道动力特性优化[J].振动与冲击振动与冲击,2013,32(2):24-28.
[4]王文斌,刘维宁,孙宁,等.基于脉冲激励的地铁运营引起邻近建筑物内振动预测方法[J].中国铁道科学中国铁道科学,2012,33(4):139-144.
[5]黄凯,白鸿柏,路纯红,等.应用复合减振器的梯形轨枕提高轨道的减振效果[J].噪声与振动控制噪声与振动控制,2013,33(5):161-165.
[6]金浩.基于改进蚁群算法梯式轨道及橡胶混凝土隔振基础优化研究[D].北京:北京交通大学,2013.
[7]刘春生.橡胶集料混凝土的耐久性能及在桥面铺装上的应用研究[D].天津:天津大学,2010.
[8]Mead D J.Vibration response and wave propagation in periodic structures[J].Journal of Engineering for Industry,1971,93:783.
[9]Belotserkovskiy P M.On the oscillations of infinite periodic beams subjected to a moving concentrated force[J].Journal of Sound and Vibration,1996,193(3):705-712.
[10]Kruse H,Popp K.A modular algorithm for linear,periodic train-track models[J].Archive of Applied Mechanics,2001,71(6):473-486.
[11]Hussein M,Hunt H.Modelling of floating-slab track with discontinuous slab Part 2:response to moving trains[J].Low Frequency Noise,Vibration and Active Control,2006,25(2):111-118.
[12]Hussein M,Hunt H.Modelling of Floating-Slab Track with Discontinuous Slab Part 1:Response to Oscillating Moving Loads[J].Low Frequency Noise,Vibration and Active Control,2006,25(1):23-39.
[13]贾颖绚.基于解析的车轨耦合模型及地铁对环境的振动影响研究[D].北京:北京交通大学,2009.