Alleviation of numerical instability in geophone-based measurement of track vibrations by utilizing a priori information

Sung Ho Joh, Norinah Abd. Rahman, Bukhari Ramli, Ki Hwan Han

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Deflections of structural elements like railway tracks and bridge spans, at which a reference point is not available for deflection measurement, have posed a dire predicament in the industry. It is because a reference point for measurement of deflections may not be available at most of structures due to the vibration of a whole structure. Even a modern technology like a high speed camera does not provide a sufficient quality to measure deflections due to the same reason. One solution to this predicament is proposed in this paper, a solution based on measurement of velocity with geophones and new algorithm of velocity integration utilizing a priori information. A priori information is employed to minimize numerical instability induced by missing integration constants. In addition, a detrending algorithm is incorporated to get rid of undesirable a low-frequency numerical artifact. Validity and reliability of the proposed method was verified by laboratory tests and finite element analysis. The laboratory tests were based on Linear Variable Differential Transformer (LVDT) measurements of geophones shaken by an electro-magnetic vibrator and on potentiometer measurements for a concrete sleeper under cyclic loading by a hydraulic actuator. For validation of feasibility and practicality, the developed algorithm was applied to evaluate performance of concrete sleepers on ballast track.

Original languageEnglish
Pages (from-to)1351-1358
Number of pages8
JournalKSCE Journal of Civil Engineering
Volume18
Issue number5
DOIs
Publication statusPublished - 2014
Externally publishedYes

Fingerprint

Seismographs
Concretes
Hydraulic actuators
Vibrators
High speed cameras
Finite element method
Industry

Keywords

  • geophone calibration
  • track deflection
  • velocity integration

ASJC Scopus subject areas

  • Civil and Structural Engineering

Cite this

Alleviation of numerical instability in geophone-based measurement of track vibrations by utilizing a priori information. / Joh, Sung Ho; Abd. Rahman, Norinah; Ramli, Bukhari; Han, Ki Hwan.

In: KSCE Journal of Civil Engineering, Vol. 18, No. 5, 2014, p. 1351-1358.

Research output: Contribution to journalArticle

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