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8 April 2009 Two-dimensional periodic actuators for frequency-based beam steering
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Abstract
The paper investigates innovative designs of piezoelectric actuators for Structural Health Monitoring (SHM). Periodic, configurations are proposed as effective means to provide actuators and sensors with strong, frequency dependent directional characteristics, which allow beam steering through a sweep of the excitation frequency. The concept has the potential to enable in-situ monitoring of critical components through strongly focused actuation (and/or sensing) and directional scanning capability, which may be achieved with very limited hardware requirements. Beam steering is achieved by exploiting interference phenomena generated by the spatial periodicity of the array and the simultaneous activation of its components. Such interference phenomena produce waves with frequency dependent directional characteristics, which allow directional scanning to be performed simply through a frequency sweep. The need for beam-forming algorithms and associated hardware is thus avoided. The concept is illustrated by considering 2D arrays of point sources of various topologies. The case of a thin membrane supporting the propagation of SV waves is first presented to provide a simple frame work of analysis. The case of Lamb waves in a thin plate is then considered to demonstrate the validity and the practicality of the proposed approach.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Romanoni, N. Apetre, M. Ruzzene, and S. Gonella "Two-dimensional periodic actuators for frequency-based beam steering", Proc. SPIE 7295, Health Monitoring of Structural and Biological Systems 2009, 729526 (8 April 2009); https://doi.org/10.1117/12.815845
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