摘要
针对在工作状态下道岔尖轨伤损难以监测的问题,建立尖轨的简化模型并求解其频散方程,对道岔尖轨中存在的导波的多模态和频散等传播特性进行了研究,提出了基于超声导波的道岔尖轨伤损监测方法,并在理论分析和有限元仿真的基础上使用超声导波监测仪对尖轨进行模拟缺陷监测试验。结果表明:采用60 kHz的超声导波能够有效监测到道岔中截面损失在3.40%以上的缺陷,采用超声导波监测道岔尖轨伤损具有可行性。
Aiming at the problem that the damage of switch rail in service is hard to monitor, the simplified model of switch rail was built and its dispersion equation was solved, thus, the propagation characteristics of guided waves in switch rail such as multiple modes and frequency dispersion were studied, the damage monitoring method of switch rail using ultrasonic guided waves was proposed. Based on the theoretical analysis and finite element analysis,monitoring experiments of simulating defects were carried out for switch rails using the ultrasonic guided wave monitor.The results indicate that defects with loss ratio of sectional area over 3. 40% can be monitored by ultrasonic guided waves whose frequency is 60 kHz,and damage monitoring of switch rail using ultrasonic guided waves is feasible.
作者
付连著
伍建军
郎向伟
唐志峰
FU Lianzhu;WU Jianjun;LANG Xiangwei;TANG Zhifeng(Shenzhen Research and Design Institute China Academy of Railway Sciences Shenzhen Guangdong 518055 China;State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Hangzhou Zhejiang 310027 China;Institute of Advanced Digital Technologies and Instrumentation Zhejiang University Hangzhou Zhejiang 310027 China)
出处
《铁道建筑》
北大核心
2018年第5期124-128,共5页
Railway Engineering
基金
中国铁道科学研究院基金(2015YJ093)
关键词
线路工程
超声导波
试验研究
道岔尖轨
伤损监测
频散
Railway line engineering
Ultrasonic guided wave
Experimental research
Switch rail
Damagemonitoring
Frequency dispersion
