Active tuned liquid damper (TLD) with magnetic fluid

Masato Abe; Yozo Fujino; Shuji Kimura

doi:10.1117/12.316931

27 July 1998 Active tuned liquid damper (TLD) with magnetic fluid

Masato Abe, Yozo Fujino, Shuji Kimura

Proceedings Volume 3329, Smart Structures and Materials 1998: Smart Structures and Integrated Systems; (1998) https://doi.org/10.1117/12.316931
Event: 5th Annual International Symposium on Smart Structures and Materials, 1998, San Diego, CA, United States

Abstract

Tuned liquid damper (TLD) is a device which absorbs energy of structural vibration through sloshing of fluid when sloshing frequency is tuned to the structural frequency. TLD is widely used to control wind-induced vibrations in civil structures. Its performance is shown to degrade either when there exists error in tuning between sloshing and structural frequencies, or when the structure is subject to non- stationary excitation. To improve the performance of TLD, active TLD which consists of magnetic fluid activated by electromagnets is proposed. At the first part of the paper, characteristics of sloshing motion of magnetic fluid subject to dynamic magnetic field is studied experimentally. Because sloshing is nonlinear phenomenon, standard linear control theory is not applicable in construction of control laws directly. Hence, a rule-based control law which effectively controls the sloshing motion and base shear force is constructed based on a rule-based control law of active dynamic vibration absorbers. At the last part of the paper, the performance of the proposed active TLD is verified experimentally using a two-story building model. Active TLD is found to give higher reduction of vibration and to be less sensitive to the error of tuning.

Citation Download Citation

Masato Abe, Yozo Fujino, and Shuji Kimura "Active tuned liquid damper (TLD) with magnetic fluid", Proc. SPIE 3329, Smart Structures and Materials 1998: Smart Structures and Integrated Systems, (27 July 1998); https://doi.org/10.1117/12.316931

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