Apply Fiber Bragg Grating Sensor to Impact Vibration Control of Cantilever Beam
Date Issued
2008
Date
2008
Author(s)
Liao, Heng-Tseng
Abstract
Generally, most people apply piezoelectric sensor to vibration control of cantilever beam and get good performance. But piezoelectric sensor would change the original property of cantilever beam due to its volume and mass. In this thesis, we choose fiber Bragg grating (FBG) sensor which has tiny mass and volume as control sensor. By applying intensity-modulated FBG which has high sensitivity to dynamic measurement, we can deal with impact vibration control of cantilever beam. In order to get good control performance, we should investigate properties of the system including cantilever beam, actuator, sensor and cantilever beam combining with PZT. There are two types of FBG sensor be used here, surface-mounted type for measuring strain and vertical type for measuring displacement. In order to attest the accuracy of FBG measurement, we also used strain gauge and LDV as sensor at the same time. We use separating modes method to design the controller. First we aim to single mode control and then apply these methods and parameters to impact control. According to the result of experiment both type of FBG sensor can successfully control first mode. However vertical type FBG sensor has higher sensitivity to high frequency modes. But it also has phase delay when measuring high frequency mode, the performance of high frequency mode control isn’t as well as surface-mounted type FBG sensor. In order to test muti-impact control ability, we use plastic ball which can bounce several times on cantilever beam and two steel balls as impact source. The experiment result shows that this vibration control system can successfully control long-time muti-times impact and short-time muti-points impact.
Subjects
cantilever beam
impact
vibration control
Type
thesis
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