Motion tracking of scaled bridge induced by wind force

Seungtaek Oh, Hak Eun Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In wind tunnel test, laser displacement transducer is widely used to extract displacement of scaled bridge induced by wind force. But, laser displacement transducer is not appropriate to measure multipoint displacements and it has a restriction that mounted location cannot be movable. Furthermore, it need to keep a certain distance from each other in order to avoid the error caused by the electrical interference. In this study, the motion tracking technique is proposed to overcome these shortcomings of the conventional measurement. The motion tracking technique is the method to extract the displacement from images which have regular time intervals sequentially. And according to improve on measurement method, the motion tracking technique reduces the errors which are occurred by having no consideration for lateral degree of freedom (DOF) and by mounting the location of laser. As a Fast Fourier transform (FFT) analysis result, displacement from images extract the frequencies by own degree of freedom effect, whereas the displacement from laser. And the time history analysis represents that displacement from images is more exact to extract vertical displacement compared with displacement of laser.

Original languageEnglish
Title of host publicationProceedings of the 9th International Conference on Structural Dynamics, EURODYN 2014
EditorsA. Cunha, P. Ribeiro, E. Caetano, G. Muller
PublisherEuropean Association for Structural Dynamics
Number of pages6
ISBN (Electronic)9789727521654
Publication statusPublished - 2014
Event9th International Conference on Structural Dynamics, EURODYN 2014 - Porto, Portugal
Duration: 2014 Jun 302014 Jul 2

Publication series

NameProceedings of the International Conference on Structural Dynamic , EURODYN
ISSN (Print)2311-9020


Other9th International Conference on Structural Dynamics, EURODYN 2014

Bibliographical note

Funding Information:
The authors wish to acknowledge the financial support by the Ministry of Land, Transport and Maritime Affairs (MLTM) through the Super Long Span Bridge R&D Center in Korea.


  • Displacement
  • Errors
  • Frequency
  • Motion tracking technique

ASJC Scopus subject areas

  • Building and Construction
  • Architecture
  • Civil and Structural Engineering


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