Modal sensitivities, spatial signal distribution andverage of segmented ring sensors and control effect ofegmented ring actuators
Date Issued
2009
Date
2009
Author(s)
Lin, Yu-Sheng
Abstract
Distributed monitoring is essential to effective actuation andibration control of shell-type structures. In this thesis, electro-mechanicsf the segmented distributed piezoelectric shell sensors applied to ringhells are evaluated. Since sensor signals are modal dependent, naturalodal characteristics, emphasizing the circumferential mode, are studiedirst. Then, with the segmentation technique, distributed segmentedensors with various lengths are designed and their signal generationsesulting from modal strains are evaluated.he total output signal includes four components: 1) a bending strainnduced signal by the circumferential oscillatory amplitude, 2) a bendingtrain induced signal by the transverse oscillatory amplitude, 3) aembrane strain induced signal by the circumferential oscillatorymplitude and 4) a membrane strain induced signal by the transversescillatory amplitude respectively at the transverse and circumferentialomponent frequencies. Furthermore, the sensor sensitivities are dividednto: 1) the transverse modal sensitivity and 2) the circumferential modalensitivity.arametric studies (e.g., ring radius, sensor thickness, ring thicknessnd sensor segment length) are conducted to evaluate the spatial signalistributions and component signal generations of segmented ring sensors.ll data indicate that ring’s circumferential, not transverse, componentode dominates the total signal generation.hen, distributed control actions induced by electrostrictive actuatoregments are evaluated the total effect can be divided into twoicroscopic control actions: the circumferential membrane and bendingontrol actions. The bending control action in total control action is majorontribution at the transverse mode. The membrane control action in totalIontrol actions is major contribution at the circumferential mode.inally, parametric studies (e.g., ring radius, actuator thickness, ringhickness, actuator segment length and applied voltage) are conducted tovaluate control effect.
Subjects
Circumferential modal
transverse modal
segmentation technique
bending strain induced signal
membrane strain induced signal
sensor sensitivity
total signal generation
bending control action
membrane control action
Type
thesis
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