Structural Damage Detection Using Virtual Passive Controllers

Structural health monitoring for flexible bridge structures using correlation and sensitivity of modal data

“…The sensitivity-based, least-squares or penalty function method exploits a truncated Taylor series expansion of natural frequencies for iteratively updating the damage variables that minimize a penalty function [32]. The change in natural frequency dx = x h À x d is expressed as a function of the difference in the damage variable vector dz = z h À z d .…”

Structural damage detection from transient responses using square-root unscented filtering

“…This idea was also pursued by Ray and Marini [14], who employed state feedback and a genetic algorithm to enhance structural sensitivity to parameter variations. Lew and Juang [15] and Lew [16] both used direct output feedback to enhance damage detection. Lew and Juang [15] used a least-squares approach to identify damage, whereas Lew [16] used a correlation approach based on neural networks.…”

“…Lew and Juang [15] and Lew [16] both used direct output feedback to enhance damage detection. Lew and Juang [15] used a least-squares approach to identify damage, whereas Lew [16] used a correlation approach based on neural networks. Lew [17] used a method to enhance damage detection using a correlation approach (change in transfer function of a tested system compared with the change due to damage).…”

Structural Damage Detection Using Sensitivity-Enhanced Autoregressive Coefficients

“…Recently, the idea of using feedback control to enhance the sensitivity of damage indices with respect to changes in structural sti®ness has been proposed, with some initial success. [1][2][3][4][5][6][7][8][9] Sensitivity-enhancing control (SEC) exploits the relationship between feedback control gains and classic measures of sensitivity in order to enhance shifts in characteristic closed-loop frequencies or shifts in characteristic closed-loop mode shapes when damage occurs. Ray and Tian 1 introduced the concept of SEC for application to smart structures.…”