地铁列车运行引起环境振动响应的人工单点列脉冲激励预测方法  

Prediction Method with Artificial Single-Point Pulse Excitations for Environmental Vibration Response Induced by In-Service Metro Train

作　　者：刘维宁[1] 袁扬 王文斌[3] 吴宗臻[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]天津市城市规戈Ⅱ设计研究院,天津300201 [3]铁科院北京工程咨询有限公司,北京100081

出　　处：《中国铁道科学》2015年第4期74-79,共6页China Railway Science

基　　金：国家自然科学基金资助项目(51278043,51378001)

摘　　要：为了在频域内精确预测地铁列车运行引起的环境振动响应,研究提出基于实测振动传递特性的人工单点列脉冲激励预测方法。应用人工单点列脉冲激励获得传播系统的振动传递特性,采用振动传递转换公式将其转化为地铁列车运行时的振动传递特性;结合已建立的实测振源数据库,预测地铁列车运行引起的环境振动响应。以地铁15号线望京站—望京东站区间的地表振动预测为例,采用该方法、数值模拟方法和链式衰减预测法分别预测该区间地表预测点处的振动响应,并与实测结果进行对比。结果表明:采用该方法可以得到受振目标测点的频谱、1/3倍频程谱、Z振级等指标,并可实现多点同步、精确的振动响应预测;与其他2种预测方法相比,该方法具有预测精确度高、预测频带宽、受振目标针对性强等特点,适用于地铁隧道修建前后对重点受振目标的频域内精确预测。The prediction method with artificial single-point pulse excitations based on the measured vibra- tion transfer characteristics was proposed to accurately predict the environmental vibration response in- duced by in-service metro train in frequency domain. The vibration transfer characteristics of the propaga- tion system were obtained by the use of artificial single-point pulse excitations. Then vibration transmi- ssion conversion formulas were used to transform them into the vibration transfer characteristics of in- service metro train. The environmental vibration response induced by in-service metro train was predicted through the established database of the measured vibration sources. Taking the surface vibration prediction of the interval from Wangjing Station to Wangjing East Station of Beijing Metro Line 15 for example, the proposed method, numerical simulation method and chain attenuation prediction method was respectively used to predict the vibration response at the measuring points of surface vibration in the interval, and the results were compared with the measured ones. Results show that the proposed method can predict the frequency spectrum, one-third octave spectrum and Z vibration level at the measuring points of the targets being vibrated, and can realize the accurate and multi-point synchronous vibration response prediction. Compared with other two prediction methods, the prediction method with artificial single-point pulse excitations has the characteristics of high accuracy, wide frequency band and powerful pertinence, which is suitable for accurately predicting vibrations in frequency domain before and after the construction of metro tunnel.

关 键 词：地下铁道 运行列车 环境振动响应 单点列脉冲激励 振动预测 振动传递特性 

分 类 号：U231[交通运输工程—道路与铁道工程] TB533.2[理学—物理]