Looseness localization for bolted joints using Bayesian operational modal analysis and modal strain energy

Author:

Hu Yu-Jia1,Guo Wei-Gong1,Jiang Cheng2ORCID,Zhou Yun-Lai3,Zhu Weidong4

Affiliation:

1. School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai, China

2. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong

3. Department of Civil & Environmental Engineering, National University of Singapore, Singapore

4. Department of Mechanical Engineering, University of Maryland, Baltimore, MD, USA

Abstract

Bayesian 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.

Funder

Shanghai Science and Technology Innovation Fund

Natural Science Foundation of Shanghai

Publisher

SAGE Publications

Subject

Mechanical Engineering

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