A study of TLCD parameters for structural vibration mitigation

Abstract In this article, the efficiency of the tuned liquid column damper (TLCD) in reducing structural vibration is analyzed. The analysis by numerical methods and by analytical methods is adopted in the search for the ideal parameters for the liquid column. The equivalent linear model is considered for the U-shaped liquid column equation of motion with damping resulting from an orifice. Thus, variation of TLCD parameters for different loads is investigated. Initially, for the numerical study in conjunction with the analytical formulation, a sinusoidal forcing is adopted. Subsequently, the action of an earthquake through the recorded ground accelerations is considered in the case study. Optimal TLCD parameters are presented via response map for reducing the structure's maximum permanent response to harmonic excitation and for reducing the structure's rms response to seismic excitation with wide frequency and various amplitude. The variation of the TLCD parameters presented by the response map is directly related to the force acting on the structure. However, it is verified that regardless of the acting force, there is an ideal frequency range to tune the TLCD where the greatest reductions in the primary system response are found. It appears that reducing the aspect ratio of the liquid column makes this range narrower, making the damper more sensitive to parameter variations, as well as its performance. It is also observed that the increase in the attenuator mass ratio combined with the correct tuning and damping ratios present greater reductions in structural vibration. Also, the frequency ratio is reduced with the increase of the mass ratio, while the damping rate of the liquid column increases. From the ideal liquid column parameters determined by the parametric analysis, structural response reductions of approximately 60% were achieved.

摘要 本文分析了调谐液体柱阻尼器（Tuned Liquid Column Damper，TLCD）抑制结构振动的效能。为探寻液柱的理想参数，本文采用数值方法与解析方法开展研究。针对带孔板阻尼的U形液柱运动方程，本文采用等效线性模型进行建模，进而考察了不同荷载下TLCD参数的变化规律。初始阶段，结合解析公式开展数值研究时，采用正弦激励作为输入。后续的案例研究中，则考虑了基于实测地面加速度的地震作用。通过响应图谱给出了最优TLCD参数：一方面可降低结构在谐波激励下的最大稳态响应，另一方面可降低结构在宽频带、多幅值地震激励下的均方根响应。响应图谱所揭示的TLCD参数变化规律，与作用于结构的荷载直接相关。但研究证实，无论荷载类型如何，均存在一个最优调谐频率区间，可使主结构响应获得最大幅度的降低。研究发现，减小液柱的长细比会收窄该最优频率区间，使阻尼器对参数变化及自身减振性能更为敏感。此外，提升阻尼器质量比，并配合合理的调谐与阻尼比，可进一步增强结构振动抑制效果。同时，随着质量比的提升，频率比会随之降低，而液柱的阻尼率则会升高。基于参数分析得到的理想液柱参数，可使结构响应降低约60%。

搜集汇总

背景与挑战

背景概述

该数据集研究了调谐液体柱阻尼器（TLCD）在减少结构振动中的效率，通过数值和解析方法分析了液体柱的理想参数。研究发现，TLCD参数的变化与作用力直接相关，且存在一个理想的频率范围来调谐TLCD，以实现最大的结构响应减少。通过参数分析确定的理想液体柱参数，实现了约60%的结构响应减少。