US 11,928,811 B2
System and method for structural vibration mode identification
Amit Surana, Newington, CT (US); Sudarshan N. Koushik, West Hartford, CT (US); and Kenji Homma, Glastonbury, CT (US)
Assigned to RTX CORPORATION, Farmington, CT (US)
Filed by Raytheon Technologies Corporation, Farmington, CT (US)
Filed on Mar. 30, 2021, as Appl. No. 17/217,427.
Prior Publication US 2022/0318973 A1, Oct. 6, 2022
Int. Cl. G06T 7/00 (2017.01); G01H 9/00 (2006.01); G01M 7/00 (2006.01)
CPC G06T 7/001 (2013.01) [G01H 9/00 (2013.01); G01M 7/00 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for determining structural vibration mode characteristics of a component, the method comprising:
obtaining digital image correlation (DIC) image data by recording a plurality of images of an imaging surface of a component with at least one imaging device, and the imaging surface has a pattern;
preparing a (DIC) dataset for the component using the DIC image data;
applying a dynamic mode decomposition (DMD) technique to the DIC dataset to determine a plurality of DMD modes;
selecting at least one dominant DMD mode from the plurality of DMD modes;
classifying each of the at least one selected dominant DMD mode as a standing wave or a traveling wave; and
determining structural vibration mode characteristics of the component by extracting the structural vibration mode characteristics from each of the at least one selected dominant DMD mode having a standing wave classification.