US 11,680,928 B2
Method of calculating sensitivity indices for structural stiffness and viscous damping coefficient of carbon composite material and method of analyzing dynamic characteristics of carbon composite material by using same
Chan-Jung Kim, Busan (KR)
Assigned to PUKYONG NATIONAL UNIVERSITY INDUSTRY-UNIVERSITY COOPERATION FOUNDATION, Busan (KR)
Filed by PUKYONG NATIONAL UNIVERSITY INDUSTRY-UNIVERSITY COOPERATION FOUNDATION, Busan (KR)
Filed on Jan. 6, 2022, as Appl. No. 17/569,808.
Claims priority of application No. 10-2021-0143860 (KR), filed on Oct. 26, 2021.
Prior Publication US 2023/0130209 A1, Apr. 27, 2023
Int. Cl. G01N 29/12 (2006.01); G01N 29/36 (2006.01)
CPC G01N 29/12 (2013.01) [G01N 29/36 (2013.01); G01N 2291/0231 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method of calculating sensitivity indices for structural stiffness and a viscous damping coefficient of a carbon composite material, using a computer or dedicated hardware, the method comprising:
collecting various types of data including measurement values obtained through a modal test on the carbon composite material to be analyzed;
calculating equivalent structural stiffness and an equivalent viscous damping coefficient of the carbon composite material to be analyzed, on the basis of the collected respective data;
converting the equivalent structural stiffness and the equivalent viscous damping coefficient into equivalent structural stiffness and an equivalent viscous damping coefficient in a particular direction with respect to a predetermined reference direction;
calculating the respective sensitivity indices according to a direction (angle) of carbon fiber by using the equivalent structural stiffness and the equivalent viscous damping coefficient resulting from the conversion; and
analyzing a relationship between the structural stiffness and the viscous damping coefficient of the carbon composite material to be analyzed, by using the respective sensitivity indices.