TY - GEN
T1 - Excitation optimization for damage detection
AU - Bement, M. T.
AU - Bewley, T. R.
PY - 2009
Y1 - 2009
N2 - A technique is developed to answer the important question: "Given limited system response measurements and ever-present physical limits on the level of excitation, what excitation should be provided to a system to make damage most detectable?" Specifically, a method is presented for optimizing excitations that maximize the sensitivity of output measurements to perturbations in damage-related parameters estimated with an extended Kalman filter. This optimization is carried out in a computationally efficient manner using adjoint-based optimization and causes the innovations term in the extended Kalman filter to be larger in the presence of estimation errors, which leads to a better estimate of the damage-related parameters in question. The technique is demonstrated numerically on a nonlinear 2 DOF system, where a significant improvement in the damage-related parameter estimation is observed.
AB - A technique is developed to answer the important question: "Given limited system response measurements and ever-present physical limits on the level of excitation, what excitation should be provided to a system to make damage most detectable?" Specifically, a method is presented for optimizing excitations that maximize the sensitivity of output measurements to perturbations in damage-related parameters estimated with an extended Kalman filter. This optimization is carried out in a computationally efficient manner using adjoint-based optimization and causes the innovations term in the extended Kalman filter to be larger in the presence of estimation errors, which leads to a better estimate of the damage-related parameters in question. The technique is demonstrated numerically on a nonlinear 2 DOF system, where a significant improvement in the damage-related parameter estimation is observed.
UR - http://www.scopus.com/inward/record.url?scp=84945193817&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84945193817
T3 - Structural Health Monitoring 2009: From System Integration to Autonomous Systems - Proceedings of the 7th International Workshop on Structural Health Monitoring, IWSHM 2009
SP - 761
EP - 768
BT - Structural Health Monitoring 2009
A2 - Chang, Fu-Kuo
PB - DEStech Publications
T2 - 7th International Workshop on Structural Health Monitoring: From System Integration to Autonomous Systems, IWSHM 2009
Y2 - 9 September 2009 through 11 September 2009
ER -