Frictional heating as an estimator of modal damping and structural degradation – a vibrothermographic approach

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Abstract

This article presents a novel approach for estimating modal damping of vibrating structures using temperature increases caused by frictional heat generation. Specifically, relying on temperature data measured during the vibration of structures as the indicator of their health conditions and relevant parameters is often termed as vibrothermography.

In this article, the theoretical background supporting this proposed method is firstly presented, in which the underlying relationship between the frictional heating and the modal damping and health conditions of vibrating structures is discussed and explained. A metal frame structure connected by bolted joints, which possessed moderate damping that can be manually adjusted by altering the bolt torque in the joints, was studied so that the structural degradation and changes of dynamic behaviours in loosening structures can be understood. Numerical simulations and experimental tests have been performed to demonstrate the viability and robustness of this approach.

Through this research, it has been demonstrated that temperature increases due to frictional heat generation can be used as a reliable estimator of modal damping for vibrating structures, based on which the structural degradation and changes of dynamic behaviours can be determined and explained. In the concluding sections of the article, the significance of the observations obtained in this research is summarised, and the potential of this approach for further development is discussed.

Conference

Conference12th Defence Science and Technology International Conference on Health and Usage Monitoring (HUMS2021)
CountryAustralia
CityMelbourne
Period29/11/212/12/21
Internet address

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