This paper explores the semi-active omnidirectional liquid column vibration absorber, a unique tuned liquid column damper consisting of multiple circularly distributed columns for the control of vibrations in all lateral directions. Each column features actuator-controlled cells that can trap liquid and adjust column cross-sections, facilitating a rapid shift in natural frequency during operation. Unlike previous semi-active tuned liquid column dampers, this design can modulate its natural frequency without altering the total liquid mass and eliminate the need for overpressure or additional springs. Validation is conducted on a full-scale omnidirectional prototype. However, the trapped liquid mass plays a crucial role in determining the damper’s optimal tuning parameters and affects the resulting restoring force, emphasizing its significance in the design process. This research introduces a comprehensive mathematical model of the absorber, accompanied by a control algorithm, and proposes a corresponding design approach. Moreover, a shape function informed by experimental damping is developed to address complexities arising from geometry and cell arrangements. The focus of the study is the lateral vibration control of high-rise civil engineering structures. Numerical and experimental analyses demonstrate the superior adaptability of the absorber to fluctuating structural properties, marking a significant improvement over its passive counterpart in various loading scenarios.

中文翻译：

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具有快速频率调节能力的半主动全向液柱减振器


本文探讨了半主动全向液柱减振器，这是一种独特的调谐液柱阻尼器，由多个圆形分布的液柱组成，用于控制所有横向的振动。每个色谱柱都配有执行器控制的单元，可以捕获液体并调整色谱柱横截面，从而促进运行过程中固有频率的快速变化。与以前的半主动调谐液柱阻尼器不同，这种设计可以在不改变总液体质量的情况下调制其固有频率，并且无需超压或额外的弹簧。验证是在全尺寸全向原型上进行的。然而，滞留的液体质量在确定阻尼器的最佳调整参数方面起着至关重要的作用，并影响由此产生的恢复力，强调了它在设计过程中的重要性。本研究介绍了减振器的综合数学模型，并辅以控制算法，并提出了相应的设计方法。此外，还开发了由实验阻尼提供的形状函数，以解决几何形状和单元排列带来的复杂性。该研究的重点是高层土木工程结构的横向振动控制。数值和实验分析表明，该减振器对波动结构特性的适应性优异，在各种负载情况下都比被动吸收器有了显著的改进。