Dynamics of Structures with Piezoelectric Sensors and Actuators for Structural Health Monitoring

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The dynamic analysis of structures with piezoelectric sensors and actuators is used in this paper to establish a method for crack detection in aerospace structures. Piezoelectric strips used as sensors and actuators are bonded on both sides of a thin structure which executes flexural oscillations. The differential voltage outputs of the piezoelectric sensors are used to detect the presence of cracks in the structure. The structural analysis uses a finite element formulation for the piezoelectric strips coupled with the structure and a nonlinear model for the cracks. This paper presents first the results of the dynamic analysis in the frequency domain of healthy and cracked plates undergoing forced flexural vibrations generated by a pair of piezoelectric actuators submitted to an oscillatory voltage excitation. The peaks in the differential voltage output obtained in the case of a cracked plate at several frequencies during the frequency sweep were found to be indicative measures for the presence of a crack in the structure. The results of the dynamic analysis in the time domain have also shown that this method has a good sensitivity in detecting cracks in the structures.

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Edited by:

L. Garibaldi, C. Surace, K. Holford and W.M. Ostachowicz

Pages:

493-498

Citation:

D. Mateescu et al., "Dynamics of Structures with Piezoelectric Sensors and Actuators for Structural Health Monitoring ", Key Engineering Materials, Vol. 347, pp. 493-498, 2007

Online since:

September 2007

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$38.00

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