Full Text:   <1959>

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CLC number: U28

On-line Access: 2017-07-04

Received: 2016-03-06

Revision Accepted: 2016-12-16

Crosschecked: 2017-06-16

Cited: 0

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Citations:  Bibtex RefMan EndNote GB/T7714


F. Lamas-Lopez


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Journal of Zhejiang University SCIENCE A 2017 Vol.18 No.7 P.553-566


Assessment of integration method for displacement determination using field accelerometer and geophone data

Author(s):  F. Lamas-Lopez, Y. J. Cui, S. Costa D’Aguiar, N. Calon

Affiliation(s):  Ecole des Ponts ParisTech, Laboratoire Navier/CERMES, Marne-la-Vallée, France; more

Corresponding email(s):   lamas1987@gmail.com

Key Words:  Railway track, Vibrations, Accelerometer, Geophone, Linear variable differential transformer (LVDT), Integration method, Deflection amplitude estimation, Measurement repeatability

F. Lamas-Lopez, Y. J. Cui , S. Costa D’Aguiar, N. Calon. Assessment of integration method for displacement determination using field accelerometer and geophone data[J]. Journal of Zhejiang University Science A, 2017, 18(7): 553-566.

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publisher="Zhejiang University Press & Springer",

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%T Assessment of integration method for displacement determination using field accelerometer and geophone data
%A F. Lamas-Lopez
%A Y. J. Cui
%A S. Costa D’Aguiar
%A N. Calon
%J Journal of Zhejiang University SCIENCE A
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%N 7
%P 553-566
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%D 2017
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1600212

T1 - Assessment of integration method for displacement determination using field accelerometer and geophone data
A1 - F. Lamas-Lopez
A1 - Y. J. Cui
A1 - S. Costa D’Aguiar
A1 - N. Calon
J0 - Journal of Zhejiang University Science A
VL - 18
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SP - 553
EP - 566
%@ 1673-565X
Y1 - 2017
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A1600212

A conventional French railway track was instrumented with accelerometers and geophones at three depths: sleeper (surface), interlayer (ITL, z=−0.93 m), and transition layer (TL, z=−1.20 m). A linear variable differential transformer (LVDT) was also used to monitor the displacement at the sleeper level. The recorded data allow the integration method (double for accelerometer and simple for geophone) for displacement determination to be assessed. Several questions need to be addressed prior to the selection of an adequate monitoring system: definition of signal filtering processes, influence on results of the different loading wavelengths, repeatability of measurements, train speed and axle load impact and their ranges of validity for each sensor. It was found that the main frequencies that caused more than 95% of the displacement of the monitored materials are in the low frequency range: <25 Hz for trains running up to 200 km/h. For an intercity train, the low frequencies are normally excited by long wavelengths, for instance, those corresponding to the 1/2 coach distance (λ=13.20 m), the bogies distance (λ=6.3 m), and the axle distance (λ=2.8 m). Comparison between the displacements deduced from the records of accelerometer and geophone and obtained from the records of LVDT shows quite consistent results; the mean displacement amplitudes obtained from accelerometers differ by only 20% from the LVDT records. The train speed does not have a strong effect on the obtained differences between sensors. The embedded sensors also gave consistent displacement results for each analysed depth. Moreover, the displacement amplitudes caused by different axle loads (locomotive or passenger coach) are distinguishable for all sensors at all depths. This validates the integration method used for the displacement determination.


创新点:1. 评价和分析一种积分方法,该方法利用低通滤波法但不消除产生变形的主要频率;2. 通过对位移、速度和加速度传感器在时域和频域结果的比较,使重复性得到保证。
结论:通过测试和分析发现,95%的位移幅值来自于波长大于轴距(2.8 m)的激励,对应的低频为25 Hz(列车运行速度为200 km/h)。通过线性可变差位移传感器、地震检波器以及加速度计直接获得或间接积分获得的位移十分接近,验证了积分方法的有效性,且其具有较高的可重复性。


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


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