Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/67428
Title: Continuous monitoring of residual torque of loose bolt in a bolted joint
Authors: Zhang, Z 
Liu, ML 
Su, ZQ 
Xiao, Y
Keywords: Bolt loosening
Bolted joint
Contact acoustic nonlinearity
Vibro-acoustic modualtion
Wave energy dissipation
Issue Date: 2017
Publisher: Elsevier
Source: Procedia engineering, 2017, v. 188, p. 278-285 How to cite?
Journal: Procedia engineering 
Abstract: Bolted joints are ubiquitous in engineering assets, performing a critical role of transferring loads among interconnecting components. Effectual inspection and monitoring of loosening of the bolts throughout their intended service life warrants a reliable service of the joints. In this study, identification of bolt loosening and quantitative estimate of the residual torque for three types of joints was attempted, theoretically and experimentally, using two approaches in a comparative manner: a wave energy dissipation (WED)-based linear acoustic approach and a contact acoustic nonlinearity (CAN)-based vibro-acoustic modulation (VM) method. In the former, an analytical model, residing on the Hertzian contact theory, was established to link the WED to the residual torque of a loose bolt. In the latter, the contact stiffness at the interconnecting interface, when a pumping vibration introducing perturbation to probing waves, was calibrated in terms of a Tayler series, on which basis a modulation index was constructed. With the index, nonlinear signal spectral features were quantitatively associated with residual torque. The two approaches were validated experimentally, to find a good agreement between theoretical prediction and experimental estimate. The comparison between two approaches reveals that the nonlinear VM-based method offers enhanced accuracy and sensitivity to bolt loosening than a linear WED-based approach, with additional capacity of detecting bolt loosening in multi-type joints.
Description: 6th Asia Pacific Workshop on Structural Health Monitoring, APWSHM, Hobart, Tasmania, Australia, 7-9 December 2016
URI: http://hdl.handle.net/10397/67428
EISSN: 1877-7058
DOI: 10.1016/j.proeng.2017.04.485
Rights: © 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.
The following publication Zhang, Z., Liu, M., Su, Z., & Xiao, Y. (2017). Continuous Monitoring of Residual Torque of Loose Bolt in a Bolted Joint. Procedia Engineering, 188, 278-285. is available at http://dx.doi.org/10.1016/j.proeng.2017.04.485
Appears in Collections:Conference Paper

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