Cable Vibration Mitigation Using Controlled Magnetorheological Fluid Dampers: A Theoretical and Experimental Investigation
Date Issued
2009
Date
2009
Author(s)
Cheng, Kuei-His
Abstract
As a critical member of cable-stayed bridges, stay cables are prone to vibration due to their low inherent damping characteristics, and this characteristic will even make cable-stayed bridges unstable. To solve these hazardous vibration problems, various measures have been developed. One of the effective ways is to install viscous dampers to reduce such vibration. However, only minimal damping value can be added because the attachment point is close to the lower anchorage. With the span of cable-stayed bridge and the length of stay cable become longer, viscous damper may not provide sufficient damping value to reduce the cable vibration. Therefore, researchers have proposed the semi-active MR-dampers to reduce cable motion as an alternative to the viscous dampers.n this study, a 13.5 m inclined cable has been setup, and a semi-active MR-damper is installed to reduce cable motion which is caused by a sinusoidal force. For the experiment and numerical simulation, the system matrices of the simplified cable model are generated from ABAQUS. The Bouc-Wen Model is used to simulate the non-liner behavior of the MR-damper using the performance test.wo control theories are verified experimentally in this study: one is employing LQG control using two acceleration signals and the damper force as feedback and the other is using Decentralized Sliding Mode Control (DSMC) theory with only local measurement as feedback. A series test is carried out to investigate the control performance which includes: unattached MR-damper, passive-on MR-damper and semi-active MR-damper. Through the results from the experimental test, the semi-active cable vibration control system with MR damper can reduce the cable motion well under different kinds of excitations.
Subjects
Stay cables
MR-damper
Decentralized sliding mode control
Semi-active control
Type
thesis
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