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Technical Briefs

Investigation of Locking Force for Stay Cable Vibration Control Using Magnetorheological Fluid Damper

[+] Author and Article Information
Min Liu1

School of Civil Engineering, Harbin Institute of Technology, Harbin, 150090, P.R.C.liumin@hit.edu.cn

Vineet Sethi

Department of Engineering Technology, College of Technology, University of Houston, Houston, TX 77024vsethi2@uh.edu

Gangbing Song2

Department of Mechanical Engineering, University of Houston, Houston, TX 77204gsong@uh.edu

Hui Li

School of Civil Engineering, Harbin Institute of Technology, Harbin, 150090, P.R.C.lihui@hit.edu.cn

1

Visiting student in the Department of Mechanical Engineering at University of Houston when the research was conducted.

2

Corresponding author.

J. Vib. Acoust 130(5), 054504 (Aug 13, 2008) (6 pages) doi:10.1115/1.2948390 History: Received April 10, 2007; Revised April 04, 2008; Published August 13, 2008

The locking force of stay cable vibration control using a magnetorheological (MR) fluid damper is investigated in this paper. For a single mode vibration of a stay cable equipped with a MR damper, the locking force formula is derived and the important factors that affect the locking force are analyzed. The experimental investigations of the locking force of the stay cable vibration control are carried out on a cable-stayed bridge model equipped with a MR damper to verify the computational locking force. For the multimode vibration of the stay cable, the modal shapes of the stay cable vibration are estimated by utilizing a pole placement observer using the acceleration values at selected locations of the stay cable, and the locking forces of the stay cable in multimode vibration are numerically obtained. In all experimental cases, the locking forces based on the analytical and numerical formulas approximately match the experimental results.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Configuration of combined stay cable/MR damper system. (a) Inclined combined stay cable/damper system. (b) In-plane combined stay cable/MR damper system without sag.

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Figure 2

Combined stay cable/MR damper system

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Figure 3

Detailed illustration of the MR sponge damper

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Figure 4

Schematic of the experimental setup for the combined stay cable/MR damper system

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Figure 5

Experimental setup of the MR damper force with different input current levels

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Figure 6

Relationship curve of the static damper force and the input current

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Figure 7

Frequency response of the combined stay cable/MR damper at the midspan of the shorter stay cable under the first mode excitation with different amplitudes: (a) with excitation amplitude of 8.65N, (b) with excitation amplitude of 7.35N, and with excitation amplitude of 5.85N

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Figure 8

Frequency response of the combined stay cable/MR damper system at the damper location under the first mode excitation with different amplitudes: (a) with excitation amplitude of 8.65N, (b) with excitation amplitude of 7.35N, and with excitation amplitude of 5.85N

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Figure 9

Acceleration time history of the combined stay cable/MR damper system under the first mode excitation with an amplitude 8.65N (a) at the midspan of the shorter stay cable and (b) at the location installed with the MR damper

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Figure 10

Mode shapes of the combined stay cable/MR damper system with multimode vibration

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