Proper orthogonal decomposition analysis of scanning laser Doppler vibrometer measurements of plaster status at the U.S. Capitol

Joseph F. Vignola; Joseph A. Bucaro; James F. Tressler; Damon Ellingston; Andrew J. Kurdila; George Adams; Barbara Marchetti; Alexia Agnani; Enrico Esposito; Enrico Primo Tomasini

doi:10.1117/12.579766

22 June 2004 Proper orthogonal decomposition analysis of scanning laser Doppler vibrometer measurements of plaster status at the U.S. Capitol

Joseph F. Vignola, Joseph A. Bucaro, James F. Tressler, Damon Ellingston, Andrew J. Kurdila, George Adams, Barbara Marchetti, Alexia Agnani, Enrico Esposito, Enrico Primo Tomasini

Author Affiliations +

Proceedings Volume 5503, Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (2004) https://doi.org/10.1117/12.579766
Event: Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 2004, Ancona, Italy

Abstract

A large-scale survey (~700 m²) of frescos and wall paintings was undertaken in the U.S. Capitol Building in Washington, D.C. to identify regions that may need structural repair due to detachment, delamination, or other defects. The survey encompassed eight pre-selected spaces including: Brumidi's first work at the Capitol building in the House Appropriations Committee room; the Parliamentarian's office; the House Speaker's office; the Senate Reception room; the President's Room; and three areas of the Brumidi Corridors. Roughly 60% of the area surveyed was domed or vaulted ceilings, the rest being walls. Approximately 250 scans were done ranging in size from 1 to 4 m². The typical mesh density was 400 scan points per square meter. A common approach for post-processing time series called Proper Orthogonal Decomposition, or POD, was adapted to frequency-domain data in order to extract the essential features of the structure. We present a POD analysis for one of these panels, pinpointing regions that have experienced severe substructural degradation.

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Joseph F. Vignola, Joseph A. Bucaro, James F. Tressler, Damon Ellingston, Andrew J. Kurdila, George Adams, Barbara Marchetti, Alexia Agnani, Enrico Esposito, and Enrico Primo Tomasini "Proper orthogonal decomposition analysis of scanning laser Doppler vibrometer measurements of plaster status at the U.S. Capitol", Proc. SPIE 5503, Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 June 2004); https://doi.org/10.1117/12.579766

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