The second-order output spectrum-based method for fault localization in ring type structures

Quankun Li, Xingjian Jing, Yingqing Guo

Research output: Journal article publicationJournal articleAcademic researchpeer-review

9 Citations (Scopus)


In this paper, the application of properties of the second-order output spectrum (SOOS) for nonlinear fault localization in ring type structures is studied. A more general ring type multiple-degree-of-freedom model, which regards nonlinear faults (bolt loosening or fatigue crack) and inherent material or boundary nonlinearities as nonlinear restoring forces, is utilized to describe the nonlinear behavior of ring type structures. Through harmonic excitation analysis and a novel local tuning approach, properties of the SOOS of nonlinear ring type structures are analyzed and clearly demonstrated with examples. Based on these properties, a novel SOOS-based method with a local damage index is proposed for nonlinear fault localization. The effectiveness and feasibility of this novel method are validated with multiple bolt loosening fault localization on a satellite-like structure in experiments and are further illustrated through comparisons with several existing methods.

Original languageEnglish
Pages (from-to)1935-1955
Number of pages21
JournalNonlinear Dynamics
Issue number3
Publication statusPublished - 1 Nov 2019


  • Damage index
  • Fault localization
  • Nonlinear fault
  • Ring type structures

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Aerospace Engineering
  • Ocean Engineering
  • Mechanical Engineering
  • Applied Mathematics
  • Electrical and Electronic Engineering


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