Signal stationarization technique in output-only damping identification

Sunjoong Kim, Ho Kyung Kim

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


The aim of this study is to propose the enhanced damping estimation process with output-only system identification technique by signal stationarization algorithm using amplitude-modulating (AM) function. First, a series of field measured data was analysed to demonstrate the effect of nonstationarity in operational monitoring data from cable-supported bridge. Next, in order to eliminate an effect of nonstationarity due to a traffic loading, AM function was calculated by the temporal root-mean-square function of measured responses. The approximated stationary process was extracted by dividing the sample record by envelop AM function. For the verification of the proposed techniques, a signal stationarization algorithm was applied to the measured acceleration response from cable-stayed bridge. After then, a damping ratio of cable-stayed bridges was estimated by applying Natural Excitation Technique combined with Eigensystem Realization Algorithm (NExT-ERA) to the stationarized signal obtained from 3-day ambient vibration data. To show the enhanced performance of the proposed procedure for damping estimation, the mean and coefficient of variance (COV) of estimated damping ratio were compared with/without signal stationarization process. The amplitude-dependency of estimated damping ratios was also analysed according to applying a signal stationarization.

Original languageEnglish
Title of host publicationIABSE Conference, Vancouver 2017
Subtitle of host publicationEngineering the Future - Report
PublisherInternational Association for Bridge and Structural Engineering (IABSE)
Number of pages7
ISBN (Electronic)9783857481536
StatePublished - 2017
Event39th IABSE Symposium in Vancouver 2017: Engineering the Future - Vancouver, Canada
Duration: 21 Sep 201723 Sep 2017

Publication series

NameIABSE Conference, Vancouver 2017: Engineering the Future - Report


Conference39th IABSE Symposium in Vancouver 2017: Engineering the Future


  • Cable-supported bridge
  • Damping estimation
  • Nonstationary
  • Operational modal analysis
  • Signal stationarization


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