基于光纤干涉振动监测技术的高速铁路线下结构监测方法研究
发布时间：2023-03-19 04:43
中国的高速铁路在过去几年里经历了巨大的发展,至今中国拥有世界上50%以上的高速铁路总里程,2020年高速铁路总里程将有望达到约21000公里。高速铁路对加强国际合作的―一带一路‖跨境项目的基础设施建设具有重要意义。尽管高速铁路为经济的发展和跨境整合提供了良好的解决方案,但未来需要的维护技术是一个重大问题。随着运营时间的增加,高速铁路面临着性能退化、自然灾害等问题,在长期运营中,不可避免地会出现混凝土裂缝、钢材腐蚀、CA砂浆层离隙等病害,严重影响列车的安全运营。首先,通过传统检查手段包括金属带、卷尺、直尺等,在高速铁路上海虹桥站观测了CA砂浆层离隙问题。对病害结构的内部状况进行初步检测。这些病害有可能导致列车通过时轨道上的振动放大。在分析CA砂浆层离隙病害特征的基础上,通过有限元数值模拟手段,计算病害分布对机车振动响应的定量影响。其次,将近年来新兴的分布式光纤监测技术与冲击映像检测方法相结合,对CA砂浆层离隙病害进行检测。对CA砂浆层修补前后轨道板振动监测数据进行分析。振动监测使用DOVS光纤连续分布式振动监测系统,DOVS是基于Φ-OTDR光纤干涉原理的分布式振动监测系统。系统通过测量...
【文章页数】：84 页
【学位级别】：硕士
【文章目录】：
摘要
ABSTRACT
CHAPTER1 INTRODUCTION
1.1 Research background
1.2 Domestic and overseas research status
1.2.1 High-speed railway underline structural defects detection
1.2.2 Optical fiber sensing technology
1.3 Research contents and objectives
CHAPTER2 STRUCTURAL FAULTS DETECTION USING DISTRIBUTED OPTICAL FIBER SENSING TECHNOLOGY
2.1 Distributed optical fiber sensing technology
2.1.1 OTDR distributed sensing technology
2.1.2 Distributed vibration sensing technology based onΦ -OTDR
2.2 Application of optical fiber sensors for space-time monitoring
2.3 Summary
CHAPTER3 HIGH-SPEED RAILWAY UNDERLINE STRUCTURE AND DISEASE STATUS
3.1 High-speed railway underline structure
3.1.1 Ballastless track
3.1.2 Foundation
3.2 Distribution and types of underline structural faults
3.2.1 Ballastless track Structural faults
3.2.2 Foundation faults
3.3 Interpretation of cement asphalt layer structural defects
3.4 Summary
CHAPTER4 NUMERICAL ANALYSIS OF HIGH-SPEED RAILWAY UNDERLINE STRUCTURE
4.1 Finite element analysis
4.1.1 Material parameters
4.1.2 Boundary conditions
4.2 Two-dimensional FEM to simulate the track plate vibration response under different distributions states of voided cement asphalt layer
4.2.1 Vehicle-track model
4.2.2 Dynamic loads
4.2.3 Results and discussion
4.3 Three-dimensional FEM to simulate the track plate vibration response under different distributions states of voided cement asphalt layer
4.3.1 Sequential loading of three-dimensional model
4.3.2 Dynamic loads
4.3.3 Results and discussion
4.4 Comparison of the vibration response using two and three-dimensional numerical simulation
4.5 Summary
CHAPTER5 APPLICATION OF OPTICAL FIBER SENSING TECHNOLOGY
5.1 Hongqiao high-speed railway optical fiber vibration monitoring
5.1.1 Monitoring section and visual inspection
5.1.2 Impact imaging detection method
5.1.3 Optical fiber sensor arrangement
5.2 On-site monitoring process
5.2.1 Data analysis method
5.2.2 Data Processing Results
5.3 Summary
CHAPTER6 CONCLUSIONS AND RECOMMENDATIONS
6.1 Conclusions
6.2 Recommendations
REFERENCES
ACKNOWLEDGEMENT
PUBLICATION
本文编号：3764580
【文章页数】：84 页
【学位级别】：硕士
【文章目录】：
摘要
ABSTRACT
CHAPTER1 INTRODUCTION
1.1 Research background
1.2 Domestic and overseas research status
1.2.1 High-speed railway underline structural defects detection
1.2.2 Optical fiber sensing technology
1.3 Research contents and objectives
CHAPTER2 STRUCTURAL FAULTS DETECTION USING DISTRIBUTED OPTICAL FIBER SENSING TECHNOLOGY
2.1 Distributed optical fiber sensing technology
2.1.1 OTDR distributed sensing technology
2.1.2 Distributed vibration sensing technology based onΦ -OTDR
2.2 Application of optical fiber sensors for space-time monitoring
2.3 Summary
CHAPTER3 HIGH-SPEED RAILWAY UNDERLINE STRUCTURE AND DISEASE STATUS
3.1 High-speed railway underline structure
3.1.1 Ballastless track
3.1.2 Foundation
3.2 Distribution and types of underline structural faults
3.2.1 Ballastless track Structural faults
3.2.2 Foundation faults
3.3 Interpretation of cement asphalt layer structural defects
3.4 Summary
CHAPTER4 NUMERICAL ANALYSIS OF HIGH-SPEED RAILWAY UNDERLINE STRUCTURE
4.1 Finite element analysis
4.1.1 Material parameters
4.1.2 Boundary conditions
4.2 Two-dimensional FEM to simulate the track plate vibration response under different distributions states of voided cement asphalt layer
4.2.1 Vehicle-track model
4.2.2 Dynamic loads
4.2.3 Results and discussion
4.3 Three-dimensional FEM to simulate the track plate vibration response under different distributions states of voided cement asphalt layer
4.3.1 Sequential loading of three-dimensional model
4.3.2 Dynamic loads
4.3.3 Results and discussion
4.4 Comparison of the vibration response using two and three-dimensional numerical simulation
4.5 Summary
CHAPTER5 APPLICATION OF OPTICAL FIBER SENSING TECHNOLOGY
5.1 Hongqiao high-speed railway optical fiber vibration monitoring
5.1.1 Monitoring section and visual inspection
5.1.2 Impact imaging detection method
5.1.3 Optical fiber sensor arrangement
5.2 On-site monitoring process
5.2.1 Data analysis method
5.2.2 Data Processing Results
5.3 Summary
CHAPTER6 CONCLUSIONS AND RECOMMENDATIONS
6.1 Conclusions
6.2 Recommendations
REFERENCES
ACKNOWLEDGEMENT
PUBLICATION
本文编号：3764580
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