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Research Papers

Frequency-Steered Acoustic Arrays: Application to Structural Health Monitoring of Composite Plates

[+] Author and Article Information
Buli Xu, Matteo Senesi

School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA 30332

Massimo Ruzzene1

School of Aerospace Engineering and School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332ruzzene@gatech.edu

1

Corresponding author.

J. Eng. Mater. Technol 133(1), 011003 (Nov 23, 2010) (6 pages) doi:10.1115/1.4002638 History: Received February 05, 2010; Revised June 17, 2010; Published November 23, 2010; Online November 23, 2010

This paper presents the design, characterization, and application of periodic piezoelectric actuator arrays for structural health monitoring. In the proposed array configuration, all elements are activated simultaneously to achieve strong frequency-dependent directional actuation, which allows beam steering through a sweep of the excitation frequency and limited hardware requirements. The array enables in situ monitoring of critical components through strongly focused actuation and directional scanning capabilities. The concept is illustrated for a selected design with quadrilateral topology on an isotropic plate. The application to composite panels is also specifically discussed by illustrating the complexity of the corresponding dispersion properties, which suggest design challenges for mode tuning. A quadrilateral design is tested for excitation of the A0 mode on a selected lay-up sequence to illustrate the generality of the proposed concept and its applicability to composites.

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Figures

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Figure 1

Two-dimensional 7×7 periodic array of point sources

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Figure 2

Location of force maxima in the wavenumber domain and intersection with dispersion relation at frequency fA0p,q: 95 kHz (solid line), 150 kHz (dashed line), 200 kHz (dash-dotted line), and 280 kHz (dotted line)

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Figure 3

Plate response for burst excitation centered at the directional frequencies of Table 1: (a) 95 kHz, (b) 150 kHz, (c) 200 kHz, and (d) 280 kHz

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Figure 4

Quadrilateral array implemented with PZT disks on an aluminum plate

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Figure 5

Array rms radiation pattern using broadband pulses

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Figure 6

Composite panel dispersion relations at ωh/cT=4: A0 solid line, SH0 dashed line, and S0 dotted line. (a) Glass fiber S2 [08] lay-up sequence, (b) carbon fiber/epoxy T700/SE84HT [02/+902] lay-up sequence, and (c) graphite/epoxy AS4/3502 [+456/−456]S lay-up sequence.

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Figure 7

Simulation results of the quadrilateral array on the composite panel: (a) force distribution and A0 mode dispersion relation at 110 kHz solid line, 145 kHz dashed line, 190 kHz dash-dotted line, 230 kHz dotted line kHz; (b) out-of-plane displacement pattern when excited by the array at 110 kHz

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