Real-time structural damage monitoring by input error function

B. H. Koh, P. Dharap, S. Nagarajaiah, M. Q. Phan

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

A newly developed structural damage monitoring technique is presented. The study focuses on capturing the initiation of multiple damages as they occur in a structure, which is similar to the concept of the fault detection filter. Previously, it has been shown that modified interaction matrix formulation provides a series of input error functions that generate a nonzero residual signal when the system experiences erroneous inputs. Error functions for each individual structural member are developed from the analogy between actuator failure and damage-induced residual force. When each individual error function is monitored, multiple damages as they occur in a structure can be simultaneously detected and isolated. Because the technique does not require frequency-domain measurements, it is readily applicable to online monitoring systems. This real-time technique also accommodates nonlinear breathing cracks and works for any type of excitation. A numerical simulation using a spring-mass system and truss structure successfully demonstrates the proposed method.

Original languageEnglish
Pages (from-to)1808-1814
Number of pages7
JournalAIAA Journal
Volume43
Issue number8
DOIs
StatePublished - Aug 2005

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