Aerospace Engineering pres.
Defense Dissertation: Wave Modeling and Propagation in Plate Structure
Professor Carlos E. S. Cesnik (Chair)
Professor Daniel J. Inman (Member)
Professor Jerome P. Lynch (Cognate)
Professor Anthony M. Waas (Member)
Date: April 30th, 2019
Time: 9:00 AM – 11:00 AM
Location: McDivitt Conference Room, 1044 FXB Building
Guided wave methods are widely used for damage detection in the field of structure health monitoring (SHM). If damages are to be effectively and accurately detected, a strong and deep understanding of wave propagation in typical structures must be developed, considering complexities associated with guided waves interactions with structural boundaries, transducers and various damage scenarios. The state of the art in numerical simulation mostly limits to finite element analyses that are either unable to handle the fine spatial-temporal resolutions required by guided wave simulation, or are computationally inefficient. Local Interaction Simulation Approach (LISA) offers a competing solution by exploiting the massively parallelization capability of the algorithm and the extensibility to incorporate sophisticated local mechanisms that allow for coupled modeling of transducers and damages.
This dissertation presents the development of the multi-GPU enabled UM-LISA numerical framework for guided wave modeling and propagation simulation and several applications in SHM and elastic metamaterial research. Multiple formulation features were developed and numerically implemented that enable versatile simulation of wave propagation in finite damped medium with various damage scenarios. UM-LISA is later extended to address different problems, including the characterization of fatigue damage in aluminum plate, the investigation of wave fields generated by phase arrays of multiple piezoelectric wafers, and the performance characterization of 3-D printed functional graded acoustic black holes. The wave propagation prediction from these applications are also tested against experimental data. The agreement between simulation and experiments demonstrate the effectiveness of utilizing numerical simulation for the investigation of wave propagation in SHM and elastic metamaterials.
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