基于先进成像的精密变形监测:铁路桥梁案例研究

IF 5.1 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Simon Hartlieb, Amelie Zeller, Tobias Haist, André Reichardt, Cristina Tarín Sauer, Stephan Reichelt
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引用次数: 0

摘要

本文将两种先进的基于成像的测量方法——多点法和远距广角法引入到结构健康监测领域。与传统的基于成像的方法相比,两者都提供了显着改善测量不确定度或视场的手段。多点方法利用计算机生成的全息图将单个对象点复制到图像中预定义的斑点模式。光点位置的空间平均提高了测量的不确定度。第二种方法称为远距广角,它使用衍射光栅来大大扩大远距物镜的视野。研究了两种方法在34 ~ 50 m距离上可实现的测量不确定度。多点法和远距广角法的标准差分别为0.027 ~ 0.034 mm和0.008 ~ 0.02 mm。在文章的第二部分,将这两种测量系统应用于某铁路杆拱桥的变形测量。安装了一个电感位移传感器和几个加速度计来验证测量的位移和动力学。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Advanced Imaging-Based Metrology for Precise Deformation Monitoring: Railway Bridge Case Study

Advanced Imaging-Based Metrology for Precise Deformation Monitoring: Railway Bridge Case Study

In this article, two advanced imaging-based metrology methods, the multipoint method and the tele-wide-angle method, are introduced to the field of structural health monitoring. Both provide the means to significantly improve either the measurement uncertainty or the field of view compared to classical imaging-based methods. The multipoint method utilizes a computer-generated hologram to replicate a single object point to a predefined spot pattern in the image. Spatial averaging of the spot positions improves the measurement uncertainty. The second method, called tele-wide-angle, uses a diffraction grating to considerably enlarge the field of view of a tele objective lens. Both methods are investigated regarding the achievable measurement uncertainty at distances between 34 and 50 m. The standard deviations of the error range between 0.027 and 0.034 mm for the multipoint method and 0.008 and 0.02 mm for the tele-wide-angle method. In the second part of the article, both measurement systems are employed in a field study, measuring the deformation of a railway bar arch bridge. An inductive displacement transducer and several accelerometers are installed to validate the measured displacements and dynamics.

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来源期刊
Structural Control & Health Monitoring
Structural Control & Health Monitoring 工程技术-工程:土木
CiteScore
9.50
自引率
13.00%
发文量
234
审稿时长
8 months
期刊介绍: The Journal Structural Control and Health Monitoring encompasses all theoretical and technological aspects of structural control, structural health monitoring theory and smart materials and structures. The journal focuses on aerospace, civil, infrastructure and mechanical engineering applications. Original contributions based on analytical, computational and experimental methods are solicited in three main areas: monitoring, control, and smart materials and structures, covering subjects such as system identification, health monitoring, health diagnostics, multi-functional materials, signal processing, sensor technology, passive, active and semi active control schemes and implementations, shape memory alloys, piezoelectrics and mechatronics. Also of interest are actuator design, dynamic systems, dynamic stability, artificial intelligence tools, data acquisition, wireless communications, measurements, MEMS/NEMS sensors for local damage detection, optical fibre sensors for health monitoring, remote control of monitoring systems, sensor-logger combinations for mobile applications, corrosion sensors, scour indicators and experimental techniques.
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