Share Email Print
cover

Proceedings Paper

Frequency-response-based damage detection approach using a shunted piezoelectric transducer with variable inductance
Author(s): Jiong Tang; Yu Ding
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Since damage usually reduces stiffness, frequency responses of a structure can be used to detect damage where the variation/decrease in natural frequencies is used as indicator. Although frequency responses are easy to measure with a small number of sensors, they are global reflections of the system dynamic property and one single FRF oftentimes lacks the sensitivity for local damage detection. In addition, locating damage is difficult as it normally requires a large number of measured natural frequency shifts. In this paper we propose a new frequency response based approach by integrating piezoelectric transducer with variable inductance to the host mechanical structure. A piezoelectric shunt circuit could significantly change the system dynamic responses. While frequency responses can be easily measured for such system (for example, by applying voltage to the piezoelectric actuators), varying the inductance can lead to a family of frequency responses. By doing so, one can get much more complete “scanned” reflection of the possible damage within the mechanical structure. The family of frequency responses provides a much larger dataset for more accurate and reliable damage detection. In this paper, an inverse sensitivity based detection algorithm is formulated and the performance improvement due to the integration of variable inductive piezoelectric shunt is demonstrated.

Paper Details

Date Published: 29 July 2004
PDF: 8 pages
Proc. SPIE 5391, Smart Structures and Materials 2004: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems, (29 July 2004); doi: 10.1117/12.539562
Show Author Affiliations
Jiong Tang, Univ. of Connecticut (United States)
Yu Ding, Texas A&M Univ. (United States)


Published in SPIE Proceedings Vol. 5391:
Smart Structures and Materials 2004: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems
Shih-Chi Liu, Editor(s)

© SPIE. Terms of Use
Back to Top