Structural damage detection method based on vibration response autocorrelation function

• Main Authors: ZHANG MUYU, PENG XIAOYANG, LI YUJIA, WANG ZIPING, ZHU JIANGUO
• Format: Patent
• Language: Chinese; English
• Published: 04.04.2023
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention provides a steel frame structure damage detection method based on a vibration response autocorrelation function, which comprises the following steps: acquiring the response of a structure in an intact state, and eliminating a trend term of the structure response to obtain a response signal of each measuring point; calculating self-correlation functions of structural responses of all the measuring points; the maximum value, namely the zero value of the self-correlation function, of each measuring point responding to the self-correlation function is taken out; arranging the maximum values of the self-correlation functions of the structural responses of the measuring points from small to large according to the measuring point numbers to form a vector; acquiring the response of the structure in a damage state, calculating a normalized autocorrelation function maximum vector in the damage state, and constructing a damage index by using the obtained autocorrelation function maximum vector; positioning