Looseness Detection Utilizing FBG Based Operational Modal Strain for a Bolted Cantilever Plate

Mingyao Liu, Liang Wan, Zechao Wang, Liu Hong, Yongzhi Qu

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

Abstract

The cantilever plate structure is widely used in wind tunnel nozzle segments. During the operation of the wind tunnel, the flexible steel plate will bear various complex loads such as shearing, bending and twisting, etc. The bolts of the plate are prone to loosen due to the fatigue damage. The methods based on the electromechanical impedance, sub-harmonic resonance and vision have been presented in the literature. However, the mentioned methods cannot detect the bolt looseness effectively in a harsh environment. To address this issue, we presented a novel method to detect the bolt looseness for the cascaded structures based on the operational strain estimated from Fiber Bragg Grating (FBG). In this work, an improved method of the operational modal analysis (OMA) presented in our previous work is employed. And then an enhanced Structural Damage Indicator (SDI) based on the operational strain is presented to detect and locate the loose bolts. Both the results from experiments and simulations showed that the SDI can detect and locate the loose bolts accurately.

Original languageEnglish (US)
Title of host publication2019 Prognostics and System Health Management Conference, PHAI-Qingdao 2019
EditorsWei Guo, Steven Li, Qiang Miao
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728108612
DOIs
StatePublished - Oct 2019
Externally publishedYes
Event10th Prognostics and System Health Management Conference, PHM-Qingdao 2019 - Qingdao, China
Duration: Oct 25 2019Oct 27 2019

Publication series

Name2019 Prognostics and System Health Management Conference, PHM-Qingdao 2019

Conference

Conference10th Prognostics and System Health Management Conference, PHM-Qingdao 2019
CountryChina
CityQingdao
Period10/25/1910/27/19

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Keywords

  • fiber Bragg grating
  • loose bolt
  • strain mode
  • structural damage index

Cite this

Liu, M., Wan, L., Wang, Z., Hong, L., & Qu, Y. (2019). Looseness Detection Utilizing FBG Based Operational Modal Strain for a Bolted Cantilever Plate. In W. Guo, S. Li, & Q. Miao (Eds.), 2019 Prognostics and System Health Management Conference, PHAI-Qingdao 2019 [8943003] (2019 Prognostics and System Health Management Conference, PHM-Qingdao 2019). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/PHM-Qingdao46334.2019.8943003