22 June 2000 Experimental activities on damage detection using magnetostrictive actuators and statistical analysis
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Abstract
Purpose of the work is to present the formulation of a new experimental procedure to employ in problems of damage analysis of structural elements. The proposed method is based on the acquisition and comparison of Frequency Response Functions (FRFs) of the monitored structure before and after a damage occurred. Structural damages modify the dynamical behavior of the structure and consequently its FRFs making possible to calculate a representative 'Damage Index.' The experimental activity was carried on using two prototypes of magnetostrictive actuators developed within the European Commission funded project named MADAVIC (Magnetostrictive Actuators for Damage Analysis and VIbration Control). Three kinds of damages have been simulated on two beam-like structures: little mass disturbances, partial cuts of the beam sections and constraints yielding. Two Damage Indices expressions representative of the damages were calculated. Much effort was spent in order to assess the reliability of the damages identification by using a 'repetitiveness index' related to the lowest, measurable damage extension and the statistical T-Test, in order to verify if each calculated index was really representative of a structural damage, rather than of unforeseen differences between the FRFs.
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Ernesto Monaco, Ernesto Monaco, Gianluca Calandra, Gianluca Calandra, Leonardo Lecce, Leonardo Lecce, } "Experimental activities on damage detection using magnetostrictive actuators and statistical analysis", Proc. SPIE 3985, Smart Structures and Materials 2000: Smart Structures and Integrated Systems, (22 June 2000); doi: 10.1117/12.388823; https://doi.org/10.1117/12.388823
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