A point-wise fiber Bragg grating displacement sensing system and its application for active vibration suppression of a smart cantilever beam subjected to multiple impact loadings
Journal
Smart Materials and Structures
Journal Volume
21
Journal Issue
6
Start Page
065003
ISSN
1361665X
09641726
Date Issued
2012
Author(s)
Abstract
In this work, active vibration suppression of a smart cantilever beam subjected to disturbances from multiple impact loadings is investigated with a point-wise fiber Bragg grating (FBG) displacement sensing system. An FBG demodulator is employed in the proposed fiber sensing system to dynamically demodulate the responses obtained by the FBG displacement sensor with high sensitivity. To investigate the ability of the proposed FBG displacement sensor as a feedback sensor, velocity feedback control and delay control are employed to suppress the vibrations of the first three bending modes of the smart cantilever beam. To improve the control performance for the first bending mode when the cantilever beam is subjected to an impact loading, we improve the conventional velocity feedback controller by tuning the control gain online with the aid of information from a higher vibration mode. Finally, active control of vibrations induced by multiple impact loadings due to a plastic ball is performed with the improved velocity feedback control. The experimental results show that active vibration control of smart structures subjected to disturbances such as impact loadings can be achieved by employing the proposed FBG sensing system to feed back out-of-plane point-wise displacement responses with high sensitivity.
Subjects
Active Control
Active Vibration Controls
Active Vibration Suppression
Bending Modes
Control Gains
Control Performance
Delay Control
Displacement Response
Displacement Sensing
Displacement Sensor
Fbg Sensing
Feed-back Sensors
Fiber Sensing
High Sensitivity
Impact Loadings
Multiple Impact
Out-of-plane
Velocity Feedback
Velocity Feedback Control
Vibration Modes
Cantilever Beams
Feedback Control
Loading
Sensors
Fiber Bragg Gratings
SDGs
Type
journal article