Modal identification of structures from seismic response data via amplitude-dependent time series model

Wei Chih Su, Chiung-Shiann Huang, Ching Yu Liu

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

Abstract

The present work develops a novel procedure of establishing an amplitude-dependent time series model for a nonlinear system and estimating the instantaneous modal parameters of the system from the dynamical responses. The undetermined coefficient in an amplitude-dependent autoregressive with exogenous input (amplitude-dependent ARX) model are assumed as functions of amplitude and are expanded by shape functions constructing by moving least-squares with polynomial basis functions. The amplitude of dynamical responses could be obtained by Hilbert transform. The instantaneous modal parameters of the system are directly estimated from the coefficient in the amplitude-dependent ARX model. Finally, the proposed approach is applied to process measured data for a frame specimen subjected to a series of base excitations in shaking table tests. The specimen was damaged during testing. The identified modal parameters are consistent with observed physical phenomena.

Original languageEnglish
Title of host publicationApplied Science and Precision Engineering Innovation
Pages1155-1159
Number of pages5
DOIs
StatePublished - 1 Jan 2014
EventInternational Applied Science and Precision Engineering Conference 2013, ASPEC 2013 - NanTou, Taiwan
Duration: 18 Oct 201322 Oct 2013

Publication series

NameApplied Mechanics and Materials
Volume479-480
ISSN (Print)1660-9336
ISSN (Electronic)1662-7482

Conference

ConferenceInternational Applied Science and Precision Engineering Conference 2013, ASPEC 2013
CountryTaiwan
CityNanTou
Period18/10/1322/10/13

Keywords

  • Amplitude-dependent ARX
  • Instantaneous modal parameters
  • Moving least-squares

Fingerprint Dive into the research topics of 'Modal identification of structures from seismic response data via amplitude-dependent time series model'. Together they form a unique fingerprint.

  • Cite this

    Su, W. C., Huang, C-S., & Liu, C. Y. (2014). Modal identification of structures from seismic response data via amplitude-dependent time series model. In Applied Science and Precision Engineering Innovation (pp. 1155-1159). (Applied Mechanics and Materials; Vol. 479-480). https://doi.org/10.4028/www.scientific.net/AMM.479-480.1155