Two-dimensional periodic actuators for frequency-based beam steering

M. Romanoni, N. Apetre, M. Ruzzene, S. Gonella

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

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.

Original languageEnglish (US)
Title of host publicationHealth Monitoring of Structural and Biological Systems 2009
DOIs
StatePublished - Jun 15 2009
Externally publishedYes
EventHealth Monitoring of Structural and Biological Systems 2009 - San Diego, CA, United States
Duration: Mar 9 2009Mar 12 2009

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7295
ISSN (Print)0277-786X

Other

OtherHealth Monitoring of Structural and Biological Systems 2009
CountryUnited States
CitySan Diego, CA
Period3/9/093/12/09

Fingerprint Dive into the research topics of 'Two-dimensional periodic actuators for frequency-based beam steering'. Together they form a unique fingerprint.

Cite this