Mr. James Scheppegrell Profile

James Scheppegrell

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Proceedings Article | 22 March 2021 Presentation + Paper

Delayed comparison error minimization for frequency domain state estimation in structures subjected to high-rate boundary change

James Scheppegrell, Austin Downey, Adriane Moura, Jacob Dodson

Proceedings Volume 11593, 115932Q (2021) https://doi.org/10.1117/12.2583331

KEYWORDS: Error analysis, Motion measurement, Optical testing, Motion estimation, Energy harvesting, Analytical research

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Many structural systems, such as aircraft, orbital infrastructure, and energy harvesting devices, experience dynamic forces along with changing structural boundary conditions. Collecting and analyzing data on these systems provides useful insight that aids design, evaluation, and function. For real-time decision-making on systems experiencing high-rate changes, completing assessments quickly enough to be relevant poses a unique set of challenges. In systems sufficiently understood and well defined, determining a system's state that experiences high-rate structural boundary condition changes can be accomplished by monitoring its frequency response. In this work, methods of frequency detection applicable to real-time state estimation of structures experiencing high-rate boundary changes were investigated; progress and findings in extracting the frequency response of a structure in real-time are presented here. A novel Delayed Comparison Error Minimization technique is presented and experimentally validated using the DROPBEAR experimental testbed at the Air Force Research Laboratory. This testbench consists of an oscillating beam with one end fixed and roller support that can move along the beam's length. Real-time estimation of pin location through the measurement of beam motion was performed using the novel Delayed Comparison Error Minimization technique. Results are compared against an FFT-based method with a variety of window lengths. The latency and precision of this method are analyzed, and the results from each method are compared, with a discussion on the applicability of each method.

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