Active tuned liquid damper (TLD) with magnetic fluid
Active tuned liquid damper (TLD) with magnetic fluid
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DOI：
10.1117/12.316931
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发表时间：
1998-07
期刊：
影响因子：
--
通讯作者：
M. Abé;Y. Fujino;S. Kimura
中科院分区：
文献类型：
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作者：
M. Abé;Y. Fujino;S. Kimura
调谐液体阻尼器(TLD)是一种将晃动频率调谐到结构频率时，通过液体晃动吸收结构振动能量的装置。TLD被广泛应用于控制土木结构的风致振动。当晃动频率和结构频率之间存在调谐误差时，或者当结构受到非平稳激励时，其性能会下降。为了提高热释光二极管的性能，提出了一种由电磁铁激活的磁流体组成的有源热释光二极管。本文首先对磁流体在动态磁场作用下的晃动运动特性进行了实验研究。由于晃动是一种非线性现象，标准的线性控制理论不能直接用于控制律的构造。因此，在基于规则的主动动力吸振器控制律的基础上，构造了一种能有效控制晃动运动和基础剪力的基于规则的控制律。最后，利用两层建筑模型对主动TLD的性能进行了实验验证。研究发现，有源TLD具有较高的减振效果，且对调谐误差较不敏感。
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.