DIC-(Digital Image Correlation)-technique-based curvature modal damage recognition method

• Main Authors: LIANG PENG, LIN JINYAN, CHEN GONGFA, LUO LIYAN
• Format: Patent
• Language: Chinese; English
• Published: 01.01.2019
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses a DIC-(Digital Image Correlation)-technique-based curvature modal damage recognition method. The method comprises the following steps of S1, applying a dynamic hammer excitation to a model of a truss structure, shooting an initial truss structure and the truss structure, to which the hammer excitation is applied, respectively by utilizing a DIC technique, so as to obtain time-sequence images of the deformation of the truss structure, meanwhile, measuring time-interval signals of the hammer excitation by utilizing a dynamic and static acquisition instrument, so as to obtain an exciting force curve, and carrying out correlation analysis treatment on the time-sequence images, so as to obtain a displacement curve; S2, enabling the obtained displacement curve and exciting force curve to correspond in accordance with a time order, importing into a dynamic signal test and analysis system, so as to obtain a frequency response function, and deriving the inherent frequency and the vibration moda