Looseness localization for bolted joints using Bayesian operational modal analysis and modal strain energy
JournalAdvances in Mechanical Engineering
PublisherSAGE Publications Inc.
MetadataShow full item record
AbstractBayesian operational modal analysis and modal strain energy are employed for determining the damage and looseness of bolted joints in beam structures under ambient excitation. With this ambient modal identification technique, mode shapes of a damaged beam structure with loosened bolted connections are obtained based on Bayesian theory. Then, the corresponding modal strain energy can be calculated based on the mode shapes. The modal strain energy of the structure with loosened bolted connections is compared with the theoretical one without bolted joints to define a damage index. This approach uses vibration-based nondestructive testing of locations and looseness of bolted joints in beam structures with different boundary conditions by first obtaining modal parameters from ambient vibration data. The damage index is then used to identify locations and looseness of bolted joints in beam structures with single or multiple bolted joints. Furthermore, the comparison between damage indexes due to different looseness levels of bolted connections demonstrates a qualitatively proportional relationship. Copyright The Author(s) 2018.
SponsorsThe author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The work described in this paper was fully supported by the grants from the Shanghai Natural Science Foundation (Grant No. 17ZR1419800) and the Shanghai Science and Technology Innovation Fund (Grant No. 17060502600).
KeywordBayesian operational modal analysis
modal strain energy
Identifier to cite or link to this itemhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85056610433&doi=10.1177%2f1687814018808698&partnerID=40&md5=ef1929de2728285afefc39eae42d633d; http://hdl.handle.net/10713/9052