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Modal Sensitivities, Spatial Signal Distribution and Average of Segmented Ring Sensors

[+] Author Affiliations
Y. S. Lin, C. C. Chu

National Taiwan University, Taipei, Taiwan

C. C. Chang

Academia Sinica, Taipei, Taiwan

H. S. Tzou

University of Kentucky, Lexington, KY

Paper No. DETC2009-87411, pp. 135-144; 10 pages
doi:10.1115/DETC2009-87411
From:
  • ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 1: 22nd Biennial Conference on Mechanical Vibration and Noise, Parts A and B
  • San Diego, California, USA, August 30–September 2, 2009
  • Conference Sponsors: Design Engineering Division and Computers in Engineering Division
  • ISBN: 978-0-7918-4898-2 | eISBN: 978-0-7918-3856-3
  • Copyright © 2009 by ASME

abstract

Distributed monitoring is essential to effective actuation and vibration control of shell-type precision structures. In this paper, electro-mechanics and sensitivities of distributed segmented piezoelectric shell sensors applied to ring shells are evaluated. Since sensor signals are modal dependent, natural modal characteristics, emphasizing the circumferential modes, are studied first. Then, with the segmentation technique, distributed segmented sensors with various lengths are designed and their signal generations resulting from modal strains are evaluated. The total output signals includes four components: 1) a bending strain induced signal by the circumferential oscillatory amplitude, 2) a bending strain induced signal by the transverse oscillatory amplitude, 3) a membrane strain induced signal by the circumferential oscillatory amplitude and 4) a membrane strain induced signal by the transverse oscillatory amplitude respectively at the transverse and circumferential modal component frequencies. Furthermore, the sensor sensitivities are divided into: 1) the transverse modal sensitivity and 2) the circumferential modal sensitivity. Parametric studies (e.g., ring radius, sensor thickness, ring thickness and sensor segment length) are conducted to evaluate the spatial signal distributions and component signal generations of segmented ring sensors. All data indicate that ring’s circumferential, not transverse, component mode dominates the total signal generation.

Copyright © 2009 by ASME
Topics: Sensors , Signals

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