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Adaptation of a Deep Liquid-Containing Tank into an Effective Structural Vibration Control Device by a Submerged Cylindrical Pendulum Appendage
International Journal of Structural Stability and Dynamics ( IF 3.6 ) Pub Date : 2021-03-17 , DOI: 10.1142/s0219455421500784 Tanmoy Konar 1 , Aparna Dey Ghosh 1
International Journal of Structural Stability and Dynamics ( IF 3.6 ) Pub Date : 2021-03-17 , DOI: 10.1142/s0219455421500784 Tanmoy Konar 1 , Aparna Dey Ghosh 1
Affiliation
Due to a high proportion of impulsive liquid mass and low inherent damping, liquid-containing deep tanks, such as conventional overhead water tanks, are generally not considered for design as tuned liquid dampers (TLDs) for passive vibration control of structures under lateral excitation. This paper presents a novel concept to convert deep tanks into effective vibration control systems through the incorporation of a submerged cylindrical pendulum appendage (CPA). The CPA is placed in the impulsive liquid zone of the tank and its oscillating frequency is tuned to the dominant frequency of the primary structure. When laterally excited, the primary structure transfers vibrational energy to the CPA, thereby setting it into oscillation. The motion of the CPA is opposed by the drag exerted by the surrounding liquid on it, which leads to dissipation of the vibrational energy. This particular design utilizes impulsive liquid mass in the energy dissipation mechanism, while allowing fluctuation in the liquid level in the upper region of the tank, thereby fulfilling the functional requirements of the tank. In this paper, the mathematical model and working principle of the deep tank with CPA (DT-CPA) damper are developed. The equations of motion of a two degree-of-freedom (2-DOF) structure-damper system are derived. The design of the DT-CPA damper is illustrated considering an example structure and the performance of the damper is examined by subjecting the structure-damper system to pre-recorded seismic base excitations. The sensitivity of the performance of the proposed damper to tuning ratio is further studied. Results indicate that the DT-CPA damper is effective in controlling structural vibrations and its performance is comparable to that of a conventional tuned mass damper (TMD) and even slightly superior to that of a conventional TLD system of the shallow tank configuration. The proposed concept thus holds potential for the utilization of deep tanks as energy dissipation devices with minimal interference to their usual functionality.
中文翻译:
深储液罐通过浸入式圆柱摆附件改造成有效的结构振动控制装置
由于高比例的脉冲液体质量和低固有阻尼,含液体的深罐,如传统的顶置水罐,通常不考虑设计为用于在横向激励下对结构进行被动振动控制的调谐液体阻尼器 (TLD)。本文提出了一种新概念,通过结合水下圆柱摆附件 (CPA) 将深罐转换为有效的振动控制系统。CPA 放置在罐的脉冲液体区,其振荡频率被调谐到主要结构的主频率。当横向激发时,初级结构将振动能量传递给 CPA,从而使其进入振荡状态。CPA 的运动受到周围液体施加在其上的阻力的反对,这导致振动能量的耗散。这种特殊的设计在能量耗散机制中利用了脉冲液体质量,同时允许罐上部区域的液位波动,从而满足罐的功能要求。本文开发了带CPA(DT-CPA)阻尼器的深舱的数学模型和工作原理。推导了二自由度(2-DOF)结构阻尼系统的运动方程。DT-CPA 阻尼器的设计以示例结构为例进行说明,并通过使结构-阻尼器系统经受预先记录的地震基础激励来检查阻尼器的性能。进一步研究了所提出的阻尼器对调谐比的性能的敏感性。结果表明,DT-CPA 阻尼器在控制结构振动方面是有效的,其性能可与传统的调谐质量阻尼器 (TMD) 相媲美,甚至略优于浅水箱配置的传统 TLD 系统。因此,所提出的概念具有将深罐用作能量耗散装置的潜力,而对其通常功能的干扰最小。
更新日期:2021-03-17
中文翻译:
深储液罐通过浸入式圆柱摆附件改造成有效的结构振动控制装置
由于高比例的脉冲液体质量和低固有阻尼,含液体的深罐,如传统的顶置水罐,通常不考虑设计为用于在横向激励下对结构进行被动振动控制的调谐液体阻尼器 (TLD)。本文提出了一种新概念,通过结合水下圆柱摆附件 (CPA) 将深罐转换为有效的振动控制系统。CPA 放置在罐的脉冲液体区,其振荡频率被调谐到主要结构的主频率。当横向激发时,初级结构将振动能量传递给 CPA,从而使其进入振荡状态。CPA 的运动受到周围液体施加在其上的阻力的反对,这导致振动能量的耗散。这种特殊的设计在能量耗散机制中利用了脉冲液体质量,同时允许罐上部区域的液位波动,从而满足罐的功能要求。本文开发了带CPA(DT-CPA)阻尼器的深舱的数学模型和工作原理。推导了二自由度(2-DOF)结构阻尼系统的运动方程。DT-CPA 阻尼器的设计以示例结构为例进行说明,并通过使结构-阻尼器系统经受预先记录的地震基础激励来检查阻尼器的性能。进一步研究了所提出的阻尼器对调谐比的性能的敏感性。结果表明,DT-CPA 阻尼器在控制结构振动方面是有效的,其性能可与传统的调谐质量阻尼器 (TMD) 相媲美,甚至略优于浅水箱配置的传统 TLD 系统。因此,所提出的概念具有将深罐用作能量耗散装置的潜力,而对其通常功能的干扰最小。