曲线地段钢弹簧浮置板轨道振动特性试验研究
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摘要
为探究曲线地段钢弹簧浮置板轨道结构振动特性,分别在钢弹簧浮置板轨道和普通道床的曲线地段进行现场测试,采用短时傅里叶变换对测试数据进行时-频处理,分析轨道结构振动时频特性。相比普通道床,在钢弹簧浮置板轨道中,钢轨和道床板振动幅值增大,振动频率向高频移动;道床板时频分布的峰值频率与车辆类型和激励原因有关;浮置板轨道中,隧道壁垂向加速度级减小23 dB,横向加速度级则增大6 dB,主要表现在8～50 Hz;隧道壁振动受到轨道板横向振动激励和浮置板轨道振动传递特性两者的影响,通过这个角度解释了曲线地段地段浮置板轨道中隧道壁横向振动放大的原因。
To study the vibration characteristics of the steel-spring floating slab track on metro curve section, the field test on dynamic response of steel-spring floating slab track and normal track was conducted in the curve section. Short-time Fourier transform(STFT) was applied to analyze time-frequency vibration characteristics of the rail(vertical), slab(vertical), tunnel wall(vertical and lateral). Comparing to vibration characteristics of normal track, the results show as follows: in the steel-spring floating slab track, the vibration amplitude of the rail is increased and more high frequency component is produced. The vibration amplitude of the slab is increased and the dominant frequency is widely distributed at 40～120 Hz. The peak frequency of the time-frequency distribution of the slab vibration is related to vehicle type and the cause of the incentive. The degree of Z direction vibration of the tunnel wall(vertical) is reduced by 19 dB, and the vibration acceleration level of tunnel wall(lateral) is enlarged by 6 dB, which is mainly increased at 8～50 Hz. The tunnel wall vibration is affected by the vibration of the slab and the vibration characteristics of the floating slab track.
To study the vibration characteristics of the steel-spring floating slab track on metro curve section, the field test on dynamic response of steel-spring floating slab track and normal track was conducted in the curve section. Short-time Fourier transform(STFT) was applied to analyze time-frequency vibration characteristics of the rail(vertical), slab(vertical), tunnel wall(vertical and lateral). Comparing to vibration characteristics of normal track, the results show as follows: in the steel-spring floating slab track, the vibration amplitude of the rail is increased and more high frequency component is produced. The vibration amplitude of the slab is increased and the dominant frequency is widely distributed at 40～120 Hz. The peak frequency of the time-frequency distribution of the slab vibration is related to vehicle type and the cause of the incentive. The degree of Z direction vibration of the tunnel wall(vertical) is reduced by 19 dB, and the vibration acceleration level of tunnel wall(lateral) is enlarged by 6 dB, which is mainly increased at 8～50 Hz. The tunnel wall vibration is affected by the vibration of the slab and the vibration characteristics of the floating slab track.
引文
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[9]吴宗臻,刘维宁,马龙祥,等.地铁浮置式轨道引起地表振动响应解析预测模型研究[J].振动与冲击, 2014,33(17):132-137.WU Zongzhen, LIU Weining, MA Longxiang, et al.Analytical prediction model of ground vibration response induced by metro floating-type track[J]. Journal of Vibration and Shock, 2014, 33(17):132-137.
[10]苏云.浮置板轨道横向动力学特性研究[D].上海:上海交通大学, 2012.SU Yun. Research on lateral dynamic characteristics of floating slab track[D]. Shanghai:Shanghai Jiaotong University, 2012.
[11]李响,任尊松,徐宁.地铁小半径曲线段钢弹簧浮置板轨道的钢轨波磨研究[J].铁道学报, 2017, 39(8):70-76.LI Xiang, REN Zunsong, XU Ning. Study on rail corrugation of steel spring floating slab track on subway with small radius curve track.[J]. Journal of the China Railway Society, 2017, 39(8):70-76.
[12] David T, Chris J. Reply to comments on Chapter 12 of“Railway Noise and Vibration:Mechanisms, Modelling and Means of Control”, by D. Thompson(with contributions from C. Jones and P.-E. Gautier), Elsevier,2009[J]. Applied Acoustics, 2011, 72(10):787-788.
[2]夏禾,曹艳梅.轨道交通引起的环境振动问题[J].铁道科学与工程学报, 2004, 1(1):44-51.XIA He, CAO Yanmei. Problem of railway traffic induced vibrations of environments[J]. Journal of Railway Science and Engineering, 2004, 1(1):44-51.
[3] Rafa?B, Bogus?aw N. Identification of the Vibration Environment of Railway Infrastructure[J]. Procedia Engineering, 2017(187):556-561.
[4]张燕.曲线地段地铁诱发的大地振动规律探讨[J].铁道建筑, 2015(8):76-79.ZHANG Yan. Exploring on regularity of ground vibration induced by metro train running at curved section[J].Railway Engineering, 2015(8):76-79.
[5]王文斌,刘维宁,贾颖绚,等.更换减振扣件前后地铁运营引起地面振动的研究[J].中国铁道科学, 2010,31(1):87-92.WANG Wenbin, LIU Weining, JIA Yingxuan, et al.Research on the vibration of the ground caused by metro train operation before and after changing the damping fasteners[J]. China Railway Science, 2010, 31(1):87-92.
[6]赵才友,王平.桥上无砟轨道橡胶减振垫减振性能试验研究[J].中国铁道科学, 2013, 34(4):8-13.ZHAO Caiyou, WANG Ping. Experimental study on the vibration damping performance of rubber absorbers for ballastless tracks on viaduct[J]. China Railway Science,2013, 34(4):8-13.
[7] LEI Xiaoyan, JIANG Chongda. Analysis of vibration reduction effect of steel spring floating slab track with finite elements[J]. Journal of Vibration and Control, 2016,22(6):1462-1471.
[8]耿传智,楼梦麟.浮置板轨道结构系统振动模态分析[J].同济大学学报(自然科学版), 2006, 34(9):1201-1205.GENG Chuanzhi, LOU Menglin. Vibration model analysis of floating slab track system[J]. Journal of Tongji University(Natural Science), 2006, 34(9):1201-1205.
[9]吴宗臻,刘维宁,马龙祥,等.地铁浮置式轨道引起地表振动响应解析预测模型研究[J].振动与冲击, 2014,33(17):132-137.WU Zongzhen, LIU Weining, MA Longxiang, et al.Analytical prediction model of ground vibration response induced by metro floating-type track[J]. Journal of Vibration and Shock, 2014, 33(17):132-137.
[10]苏云.浮置板轨道横向动力学特性研究[D].上海:上海交通大学, 2012.SU Yun. Research on lateral dynamic characteristics of floating slab track[D]. Shanghai:Shanghai Jiaotong University, 2012.
[11]李响,任尊松,徐宁.地铁小半径曲线段钢弹簧浮置板轨道的钢轨波磨研究[J].铁道学报, 2017, 39(8):70-76.LI Xiang, REN Zunsong, XU Ning. Study on rail corrugation of steel spring floating slab track on subway with small radius curve track.[J]. Journal of the China Railway Society, 2017, 39(8):70-76.
[12] David T, Chris J. Reply to comments on Chapter 12 of“Railway Noise and Vibration:Mechanisms, Modelling and Means of Control”, by D. Thompson(with contributions from C. Jones and P.-E. Gautier), Elsevier,2009[J]. Applied Acoustics, 2011, 72(10):787-788.