文档介绍：Experimental Demonstration of Fiber Bragg Grating Strain Sensors
for Structural Vibration Control
K. Chaua and B. Moslehia, G. Songb and V. Sethib
aIntelligent Fiber Optics System Corporation (IFOS), 650 Vaqueros Avenue, Sunnyvale, CA 94085
bDepartment of Mechanical Engineering, University of Houston, Houston TX 77204
ABSTRACT
We report on the use of a high-speed wavelength division multiplexing (WDM) technique for multiplexing Fiber
Bragg Grating (FBG) sensors applied to structural Vibration Control for the measurement of strain, permitting many
sensing devices along a single optical fiber at different locations collecting samples at 5000 Hz with microstrain
resolution. In this demonstration, a cantilevered flexible aluminum beam is used as the object for vibration control.
A piezoceramic patch surface-bonded to the cantilevered end of the beam is used as an actuator to suppress the beam
vibration. Various active vibration controllers such as positive position feedback (PPF), strain rate feedback (SRF),
proportional plus derivative (PD), pole placement, and sliding mode based robust control are tested by using the
fiber optical sensor for feedback purpose. Experiments essfully demonstrate that the signals from the fiber optic
sensor can be used for active feedback control of the beam vibration.
Key words: active vibration control, fiber optic sensors, positive position feedback control, strain rate feedback
control, piezoelectric materials.
1. INTRODUCTION
Optical fiber sensors were introduced over a decade ago for vibration sensing and monitoring. Huston et al. 19911
presented results of using a statistical-mode fiber optic sensor as a spatially distributed vibration transducer for
monitoring the vibrations of a structural member on a scaled laboratory bridge model. The fiber optic vibration
measurements pared with simultaneous piezoelectric accelerometer point measurements. Berkoff et al.