The Dynamic Measurement Using Fiber Bragg Grating Sensor and Vibration Suppression Control of Rail System
Date Issued
2011
Date
2011
Author(s)
Wu, Rong-Hua
Abstract
This paper mainly investigates the dynamic characteristics and vibration control of the rail structure. Besides, this paper also explores the effect of cantilever beam frequency response by the excitation method of impact and roll. We choose fiber bragg grating (FBG) as a feedback control sensor and combine with PZT as the actuator to accomplish the vibration suppression control. By applying intensity-modulated FBG which has high sensitivity to dynamic measurement, we can deal with transient motion of system and even figure out the tiny change of frequency which is caused by boundary condition.
First, we design different parameters and achieve vibration suppression for each modal individually and find out the best parameter of transient motion. Second, we apply these parameter to rail system under the various excitation of steel ball. In addition, we find out the effect of two different adhesive methods for FBG applied to the cantilever system and compare experimental results with simulation results in the steel ball impact and the piezoelectric percussion hammer experiment. On the other hand, we also discuss the influence of frequency response for system under different moving speed of the load.
In conclusion , we carry out good vibration suppression result of rail system in different excitation ways , and we know there is a better recognition of bending mode and torsional mode by using vertical adhesive and that there is a better recognition of lateral mode by using inplane adhesive. Furthermore, we verify velocity is one of important impact factors in the low frequency of cantilever beam and there exists a internal resonance phenomenon of steel ball‐cantilever beam system .
Subjects
vibration suppression
moving mass
actuator
sensor
Positive feedback control
Type
thesis
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