漏表面波IMF_(1)能量识别无砟轨道脱空适用性研究  

Applicability of Leaky Surface Wave IMF1 Energy to Identify Ballastless Track Void

作　　者：马嘉霈 袁笙哲 肖军华[1,2] 李航 潘越 苏志鹏 MA Jiapei;YUAN Shengzhe;XIAO Junhua;LI Hang;PAN Yue;SU Zhipeng(The Key Laboratory of Road and Traffic Engineering,Ministry of Education,Tongji University Shanghai,201804,China;Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety Shanghai,201804,China;Guangxi Communications Design Group Co.,Ltd.Nanning,530029,China)

机构地区：[1]同济大学道路与交通工程教育部重点实验室,上海201804 [2]上海市轨道交通结构耐久与系统安全重点实验室,上海201804 [3]广西交通设计集团有限公司,南宁530029

出　　处：《振动．测试与诊断》2023年第5期850-858,1033,1034,共11页Journal of Vibration,Measurement & Diagnosis

基　　金：国家重点研发计划资助项目(2017YFB1201204);中国铁路上海局集团有限公司科研资助项目(2022059)。

摘　　要：为了研究漏表面波法对高铁无砟轨道层间脱空检测的适用性,建立脱空特征指标,通过含层间脱空的板式无砟轨道实尺模型进行试验,建立空气‑无砟轨道耦合有限元模型,分析不同工况下的冲击响应声场分布特征;进一步对漏表面波信号进行希尔伯特‑黄变换,保留高频特征信号至第1阶本征模函数(intrinsic mode function,简称IMF_(1)),分解低频干扰信号至高阶本征模函数,提出以IMF_(1)能量为特征指标的层间脱空判识方法。研究结果表明:随着脱空长度和脱空至荷载冲击点距离的增大,漏表面波IMF_(1)能量分布呈现正相关变化趋势;IMF_(1)能量对CRTSII型板式无砟轨道板中CA砂浆层脱空0.2~0.5 m较为敏感,基于漏表面波的CA砂浆层脱空检测具备一定理论可行性。To study the applicability of the leaky surface wave method for identifying the interstratified void of high-speed railway ballastless track,the authors establish the characteristic index of the void,through the fullscale model test of slab ballastless track with the interstratified void.Then,the coupled finite element model of air ballastless track is established to analyze the distribution characteristics of impact response sound field under different working conditions.The Hilbert Huang transform is further performed on the leaky surface wave signal,and the high-frequency characteristic signal is retained to the first order intrinsic mode function(IMF1).Further,the low-frequency interference signal is decomposed to the higher-order eigenmode function,and the interlayer void identification method is proposed based on IMF1 energy.The results show that the energy distribution of leaky surface wave IMF1 presents a positive correlation trend,with the increase of void length and the distance from void to load impact point.In addition,IMF1 energy is sensitive to cement asphalt(CA)mortar layer void 0.2~0.5 m in China railway track system II(CRTSII)type ballastless track slab,and CA mortar layer void identification based on the leaky surface wave has certain theoretical feasibility.

关 键 词：板式无砟轨道 脱空识别 漏表面波 本征函数 第1阶本征模函数能量 

分 类 号：TH707[机械工程—仪器科学与技术] TH89[机械工程—精密仪器及机械] U216.4[交通运输工程—道路与铁道工程]