Development of the U-Doppler Non-contact Vibration Measuring System for Diagnosis of Railway Structures

Uehan, Fumiaki

doi:10.2219/rtriqr.49.178

Cited by 15 publications

(5 citation statements)

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“…4(b)). The vibration behavior of the entire structure can be determined by computing the displacement vectors of many points on the bridge in real-time, and the maximum deflection was also measured with an error of about 5% against the nearby laser measurement result [3].…”

Section: Structural Vibration Measurement Using Video Cameramentioning

confidence: 99%

Recent Research on Railway-specific Dynamic Issues

Uehan

2023

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Railway system is composed of many sub-systems such as overhead contact lines, vehicles, tracks and structures, which interact with each other and show complex dynamic behaviors. We are working on the elucidation of and countermeasures for railway-specific phenomena caused by the interaction of sub-systems, such as damage due to natural disasters, train running safety, and deterioration of structures, using our own simulation and experiment/measurement technologies. This report introduces examples of recent research in the field of railway dynamics, related to improvement of resilience against natural disasters, digitalization of structure maintenance, hybridization of OCL/pantograph simulation, and weight reduction of train car bodies.

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Section: Structural Vibration Measurement Using Video Cameramentioning

confidence: 99%

Recent Research on Railway-specific Dynamic Issues

Uehan

2023

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“…In addition, one of the viaduct's longitudinal beams was measured for vertical vibration using the U-Doppler system [11]. Ground data was obtained through a surface-wave survey conducted in parallel with the vibration measurements.…”

Section: Measurement Of Train-induced Vibrations Of the Wayside Grounmentioning

confidence: 99%

A Numerical Simulation Method for Ground and Building Vibration Based on Three Dimensional Dynamic Analysis

Yokoyama¹,

Izumi²,

Watanabe

2016

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“…The natural frequency measurement [5,6] is being executed by the speedometer, the acceleration sensor, and the laser Doppler velocimeter, etc. now [7,8]. However, in this study, the possibility of assessment of the natural frequency by DIC was mainly examined.…”

Section: Introductionmentioning

confidence: 99%

Damage Assessment of a Structure by a Digital Image Correlation Method

Yokota

Ohnuki²,

Machida

et al. 2011

KEM

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Health assessment of a structure is various. In architecture and civil engineering, a natural frequency is calculated by conducting the frequency analysis of the response waveform of the structure. The natural frequency measurement has been performed with a speedometer, an acceleration sensor and a laser Doppler velocimeter, but possibility of the evaluation of the natural frequency by the digital image correlation method was examined mainly. In the case of the digital image correlation method, if a picture and time are connected, the displacement response of the structure is obtained. Hence, we considered the applicability of it to the vibration phenomenon. We carried out displacement comparison with the finite element method, and then investigated the accuracy of the displacement response waveform. Furthermore, it succeeded in assessment of the natural frequency by the frequency analysis. The health assessment of the structure is possible by using the digital image correlation method and frequency analysis.

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Development of the U-Doppler Non-contact Vibration Measuring System for Diagnosis of Railway Structures

Cited by 15 publications

References 1 publication

<b>Recent Research on Railway-specific Dynamic Issues</b>

<b>Recent Research on Railway-specific Dynamic Issues</b>

<b>A Numerical Simulation Method for Ground and Building Vibration Based on Three Dimensional Dynamic Analysis</b>

Damage Assessment of a Structure by a Digital Image Correlation Method

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