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On-line Access: 2024-03-13

Received: 2023-02-14

Revision Accepted: 2023-06-26

Crosschecked: 2024-03-13

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Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Junyuan ZHENG

https://orcid.org/0000-0001-5203-3136

Duojia SHI

https://orcid.org/0000-0001-5081-7973

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Journal of Zhejiang University SCIENCE A 2024 Vol.25 No.3 P.206-222

http://doi.org/10.1631/jzus.A2300085


A method for support stiffness failure identification in a steel spring floating slab track of urban railway: a case study in China


Author(s):  Junyuan ZHENG, Caiyou ZHAO, Duojia SHI, Ping WANG, Jian WANG, Bolong JIANG, Xi SHENG

Affiliation(s):  Key Laboratory of High-speed Railway Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China; more

Corresponding email(s):   zcy848279@163.com

Key Words:  Floating slab track, Support stiffness, Detailed analytical model, Failure identification, Monitoring system


Junyuan ZHENG, Caiyou ZHAO, Duojia SHI, Ping WANG, Jian WANG, Bolong JIANG, Xi SHENG. A method for support stiffness failure identification in a steel spring floating slab track of urban railway: a case study in China[J]. Journal of Zhejiang University Science A, 2024, 25(3): 206-222.

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journal="Journal of Zhejiang University Science A",
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pages="206-222",
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publisher="Zhejiang University Press & Springer",
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Abstract: 
The extensive use of steel spring floating slab tracks has effectively addressed the challenge of alleviating the environmental vibrations induced by urban rail transit systems. However, under the combined action of train dynamic loads and complex environmental factors, problems, such as the fracture of steel spring vibration isolators and suspension vibrations induced by the uneven settlement of the base, often occur. The failure of isolator support stiffness is often hidden in its early stages and is challenging to identify by conventional detection methods. At the same time, it will aggravate the wheel‍–‍rail interaction, accelerate the deterioration of track structure, and even affect the driving safety. This study first establishes a detailed coupled train-floating slab track-foundation analytical model. Then the influence of the vibration isolator support stiffness failure on the dynamic indices of the floating slab track system response is analyzed. A set of defect identification methods that can detect the number of failed steel springs, severity of damage, and their location is proposed. Finally, an intelligent monitoring system for support stiffness of floating slab track is built by combining the density-based spatial clustering of applications with noise algorithm and statistical data analysis and is applied to a rail line in southern China. During a three-year monitoring campaign, a suspension failure and a fracture of a steel spring were each successfully detected and detailed failure information was obtained. Field investigation results were consistent with the damage identification results. After repair, the track structure dynamic response returned to the average pre-damage level and further deterioration had been arrested. The proposed damage identification methods and monitoring system provide an approach for intelligent identification of track structure support stiffness failures.

城市轨道交通钢弹簧浮置板轨道支承刚度失效识别方法:一项中国的案例研究

作者:郑钧元1,2,赵才友1,2,师多佳1,2,王平1,2,王建3,姜博龙4,盛曦5
机构:1西南交通大学,高速铁路线路工程教育部重点实验室,中国成都,610031;2西南交通大学,土木工程学院,中国成都,610031;3青岛零一动测数据科技有限公司,中国青岛,266000;4中国铁路设计集团有限公司,城市轨道交通数字化建设与测评技术国家工程研究中心,中国天津,300308;5深圳大学,城市智慧交通与安全运维研究院,中国深圳,518060
目的:在列车往复动力作用和复杂环境因素耦合作用下,常出现诸如钢弹簧隔振器断裂、基底不均匀沉降诱发吊空等隔振器支承刚度失效的问题。本文提出一种钢弹簧浮置板轨道支承刚度失效的方法,能及时识别失效数量、失效程度、失效位置,以避免刚度失效引起的轨道结构劣化和行车安全威胁。
创新点:1.分析隔振器支承刚度失效对浮置板轨道系统各动力指标的影响,并构建一套浮置板轨道钢弹簧失效识别方法;2.结合具有噪声的基于密度的聚类方法(DBSCAN)算法和统计分析构建一套浮置板轨道支承刚度智能监测系统,并应用于中国南部某线路。
方法:1.通过动力响应敏感性分析,得出浮置板自振频率、动位移、转角对支承刚度失效的敏感性较高(图5和6);2.通过分析多种刚度失效的情况,得出敏感性指标和支承刚度失效的关系(表3和4,图8);3.基于上述成果,构建智能监测系统并应用到现场,验证方法的有效性(图13和15)。
结论:1.动力学模型的敏感性分析表明,列车荷载下的浮置板一阶垂向自振频率、最大垂向动位移、转角有效值易受刚度失效影响。2.浮置板的一阶垂向频率主要跟失效数量有关;浮置板最大垂向动位移与失效高度具有较好的线性关系;浮置板转角之间的大小关系对失效位置很敏感。3.以上述方法为理论基础构建浮置板轨道支承刚度智能监测系统,成功识别出钢弹簧失效。

关键词:浮置板轨道;支承刚度;精细化模型;失效识别;监测系统

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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