Ph.D. Thesis Defense Announcement

Finite Element Model Updating of Exponential Non-Viscous Damping Systems

By: Yu Otsuki

Advisor:

Dr. Yang Wang (CEE)

Committee Members: Dr. Alper Erturk (ME), Dr. Chloé Arson (CEE), Dr. Jorge Macedo (CEE), Dr. Aditya Kumar (CEE)

Date and Time:  July 20, 2023 at 11AM Eastern Time

Location: SEB122 and Zoom: https://gatech.zoom.us/j/95324809062

Finite element (FE) models are mathematical representations that simulate the physical behavior of various
engineering systems. The majority of engineering structural models employ viscous damping due to its
mathematical simplicity. However, significant differences can exist between the actual damping behavior of
structural systems and the prediction of a viscous damping model. Alternatively, using a kernel function
and a convolutional integral in the equation of motion, "non-viscous damping" has been proposed to
incorporate time-hysteresis damping effects that are absent in viscous damping. Compared to undamped
or viscous damping systems, there have been very limited studies on the FE model updating of
non-viscous damping systems, especially in their practical applications and validations with real-world
as-built structures. The objective of this thesis is to develop diverse approaches for FE model updating of
non-viscous damping systems using exponential kernel functions. Additionally, the thesis performs
experimental validations and comparisons between the proposed non-viscous damping approaches and
conventional viscous damping approaches.