Effect of magnetic field on a tuned liquid damper using a magnetic fluid
Effect of magnetic field on a tuned liquid damper using a magnetic fluid
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DOI：
10.3233/jae-2002-304
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发表时间：
2002
影响因子：
0.6
通讯作者：
Y. Ohira;H. Houda;T. Sawada
中科院分区：
文献类型：
--
作者：
Y. Ohira;H. Houda;T. Sawada
研究了使用磁流体的调谐液体阻尼器（TLD）（称为“调谐磁流体阻尼器”（TMFD））的频率响应。一个单自由度的调谐质量阻尼器（TMD）的类比是用来定义的有效质量，刚度和阻尼，然后从实验结果估计这些参数。数值模拟被用来检查TMFD和适当的磁场条件有效阻尼预测。特别是，通过在无阻尼结构的谐振频率附近的点处切换所施加的磁场来改善TMFD的性能。调谐液体阻尼器（英语：Tuned liquid damper）是一种利用液体晃动来抑制振动的被动机械阻尼器。土木工程领域的许多研究人员已经研究了TLD的性能。Sun等人（1）测量了具有不同罐形状和不同液体粘度的TLD中的液体运动，并使用单自由度调谐质量阻尼器（TMD）模拟来描述复杂的非线性特性。Modi和Munshi（2）进行了一项参数研究，重点是通过引入二维障碍物来提高矩形调谐液体阻尼器的能量耗散效率。他们观察到使用障碍物时能量耗散显著增加，高达60%。Yamamoto和Kawahara（3）使用改进的ALE方法进行了数值研究，以阐明TLD结构控制的有效性。Ab ′ e等人（4）提出了一种新的主动式磁流变仪，它使用磁流体来提高磁流变仪的性能，并通过实验研究了其可行性。磁流体是一种稳定的介质，其基本上是流体，但也具有与固体磁体相当的磁特性。它可以通过施加磁场来限制、定位、成形和控制。在本文中，我们描述了进一步的实验，这种调谐磁流体阻尼器（TMFD），扩大的研究由Abet等人。我们还开发了一个分析模型TMFD使用的类比与调谐质量阻尼器（TMD），其中的总质量的磁性流体在容器中被分离成一个有效质量和一个非有效质量。根据实验结果计算了TMFD参数和磁流体水动力，并进行了数值模拟，以检验该模型的有效性。
The frequency response of a tuned liquid damper (TLD) which uses a magnetic fluid (called a "tuned magnetic fluid damper" (TMFD)) is investigated. A single-degree-of-freedom tuned mass damper (TMD) analogy is used to define the effective mass, stiffness and damping and these parameters are then estimated from experimental results. A numerical simulation is used to examine the TMFD and appropriate magnetic field conditions for effective damping are predicted. In particular, the performance of the TMFD was improved by switching the applied magnetic field at a point near the resonant frequency of the undamped structure. A tuned liquid damper (TLD) is a passive mechanical damper that uses a sloshing liquid to dampen oscillations. Many researchers in the civil engineering field have examined the performance of TLDs. Sun et al. (1) measured liquid motion in TLDs with different tank shapes and different liquid viscosities and described the complex non-linear characteristics using a single-degree-of-freedom tuned mass damper (TMD) analogy. Modi and Munshi (2) performed a parametric study focused on enhancing the energy dissipation efficiency of a rectangular tuned liquid damper through introduction of a two-dimensional obstacle. They observed a significant increase, up to 60%, in energy dissipation when using the obstacle. Yamamoto and Kawahara (3) performed a numerical study using a modified ALE method to clarify the effectiveness of structural control by TLDs. Ab ´ e et al. (4) proposed a new active TLD which uses a magnetic fluid to enhance the performance of the TLD and studied its feasibility experimentally. A magnetic fluid is a stable medium which is essentially a fluid but also has magnetic properties comparable to those of a solid magnet. It can be confined, positioned, shaped and controlled by the application of magnetic fields. In the present paper we describe further experiments for this tuned magnetic fluid damper (TMFD), expanding on the study by Abet al. We also develop an analytical model for the TMFD using an analogy with a tuned mass damper (TMD) in which the total mass of the magnetic fluid in the container is separated into an effective mass and a non-effective mass. The TMFD parameters and the magnetic fluid hydrodynamic force are calculated from experimental results and then a numerical simulation is carried out in order to test this model of and examine the effectiveness of the TMFD.