INVESTIGATION OF TUNED LIQUID DAMPERS UNDER LARGE AMPLITUDE EXCITATION
INVESTIGATION OF TUNED LIQUID DAMPERS UNDER LARGE AMPLITUDE EXCITATION
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DOI：
10.1061/(asce)0733-9399(1998)124:4(405
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发表时间：
1998-04
期刊：
影响因子：
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通讯作者：
D. Reed;J. Yu;H. Yeh;S. Gardarsson
中科院分区：
文献类型：
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作者：
D. Reed;J. Yu;H. Yeh;S. Gardarsson
通过室内试验和数值模拟，研究了调谐液体阻尼器（TLD）的性能。大振幅激励是主要焦点，因为先前的研究仅限于小振幅运动。通过精确控制的振动台试验测量了基底剪力和水面变化的时程。结果与数值模型进行了比较。采用随机选择数值方法求解完全非线性浅水波方程。结果表明，该模型充分捕捉基本的物理现象，包括波破碎，为大多数的频率范围内的利益，并在广泛的振幅激励。结果表明，调谐液体阻尼器的响应频率随激励幅值的增大而增大，表现为一个硬化弹簧系统。为了实现最鲁棒的系统，阻尼器的设计频率，如果它是由线性化的水波理论计算，应设置在低于结构响应频率的值，因此，阻尼器的实际非线性频率匹配的结构响应。结果发现，即使阻尼器的频率有轻微的失谐，阻尼器总是表现良好，我们没有观察到在本研究中测试的实验参数范围很广的不利影响。
The behavior of tuned liquid dampers (TLD) was investigated through laboratory experiments and numerical modeling. Large amplitude excitation is the primary focus, as previous research was limited to small amplitude motion. Time histories of the base shear force and water-surface variations were measured by precisely controlled shaking table tests. The results are compared with a numerical model. The random-choice numerical method was used to solve the fully nonlinear shallow-water wave equations. The results suggest that the model captures the underlying physical phenomenon adequately, including wave breaking, for most of the frequency range of interest and over a wide range of amplitude excitation. It was found that the response frequency of tuned liquid dampers increases as excitation amplitude increases, and the TLD behaves as a hardening spring system. To achieve the most robust system, the design frequency for the damper, if it is computed by the linearized water-wave theory, should be set at the value lower than that of the structure response frequency; hence, the actual nonlinear frequency of the damper matches the structural response. It was found that, even if the damper frequency had been mistuned slightly, the TLD always performed favorably; we observed no adverse effect in the wide range of experimental parameters tested in this study.