期刊
SMART MATERIALS AND STRUCTURES
卷 23, 期 2, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/0964-1726/23/2/025007
关键词
sensitivity analysis; structural vibration monitoring; autoregressive modeling; autoregressive spectrum estimation; Yule-Walker method
资金
- National Science Foundation through Sensors and Sensing Systems Program [CMMI-0926898]
- Commonwealth of Pennsylvania, Department of Community and Economic Development, through the Pennsylvania Infrastructure Technology Alliance (PITA)
In the past few decades many types of structural damage indices based on structural health monitoring signals have been proposed, requiring performance evaluation and comparison studies on these indices in a quantitative manner. One tool to help accomplish this objective is analytical sensitivity analysis, which has been successfully used to evaluate the influences of system operational parameters on observable characteristics in many fields of study. In this paper, the sensitivity expressions of two damage features, namely the Mahalanobis distance of autoregressive coefficients and the Cosh distance of autoregressive spectra, will be derived with respect to both structural damage and measurement noise level. The effectiveness of the proposed methods is illustrated in a numerical case study on a 10-DOF system, where their results are compared with those from direct simulation and theoretical calculation.
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