Subspace-based damage detection under changes in the ambient excitation statistics ?
A subspace-based damage detection test is considered, confronting a reference modal model to new data. The effect of changes in the ambient excitation covariance on the damage detection test is analyzed. A new statistical test is derived based on a residual that is robust to changes in the excitation covariance. A fast and numerically stable computation of the test is explained. Three numerical applications show the robustness of the new approach to changing excitation.
damage detection ambient excitation structural vibration monitoring subspace methods hypothesis testing