A tuned liquid inerter system for vibration control

Zhao, Zhipeng; Zhang, Ruifu; Jiang, Yiyao; Pan, Chao

doi:10.1016/j.ijmecsci.2019.105171

Cited by 97 publications

(30 citation statements)

References 36 publications

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“…Subsequently, Ikago and his coworkers proposed a two‐terminal inertial system (tuned viscous mass damper [TVMD]), which explicitly used mass enhancement and damping enhancement for the first time . The concept of the inerter has made many studies focus on new inerter mechanisms and structural vibration mitigation by using various inerter systems …”

Section: Introductionmentioning

confidence: 99%

“…47,54,55 The concept of the inerter has made many studies focus on new inerter mechanisms and structural vibration mitigation by using various inerter systems. [56][57][58][59][60][61][62][63][64][65] In addition to the development of new devices, there is another key issue in the research and development of an inerter system, namely, the parameter determination of its components. Based on fixed-point theory (tuning theory), 66 Ikago et al 47 provided close-form optimum design equations for the TVMD.…”

Section: Introductionmentioning

confidence: 99%

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Damping enhancement principle of inerter system

Zhang

Zhao

Pan

et al. 2020

Struct Control Health Monit

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101

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Summary Interactions among an inerter, spring, and energy dissipation element (EDE) in an inerter system can result in a higher energy dissipation efficiency compared to a single identical EDE, which is referred to as the damping enhancement effect. Previous studies have mainly concentrated on the vibration mitigation effect of the inerter system without an explicit consideration or utilization of the damping enhancement mechanism. In this study, the theoretical essence of the damping enhancement effect is discovered, and a universal design principle is proposed for an inerter system. A fundamental equation is found and demonstrated on the basis of closed‐form stochastic responses, which establishes a bridge between the damping deformation enhancement factor (DDEF) and the response mitigation ratio, thus clarifying the relationship of the damping enhancement effect and the response mitigation effect. Inspired by the equation, a novel damping‐enhancement‐based strategy is proposed to determine the key parameters of an inerter system. Following the performance‐demand‐based design philosophy, the parameters of the inerter system can be determined in the design condition of a target‐damping‐enhancement effect. Through the implementation of the damping enhancement equation, the damping parameter of an inerter system can be directly obtained by the prespecified DDEF and the displacement response mitigation ratio. The influence of parameters on the response mitigation effect and the damping enhancement effect is then investigated to determine ways of obtaining the other two parameters in an inerter system. Finally, design examples are conducted to verify the proposed strategy and the theoretical relationship revealed by the damping enhancement equation. The results show that the proposed design strategy explicitly utilizes the damping enhancement effect for vibration control, where the target of the DDEF is effective in enhancing the efficiency of the EDE for energy dissipation. In the design condition of the target DDEF, the implementation of the proposed damping enhancement equation provides an inerter system with a practical equation to determine the key parameters of an inerter system in a direct manner.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Damping enhancement principle of inerter system

Zhang

Zhao

Pan

et al. 2020

Struct Control Health Monit

Self Cite

101

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“…As a robust evaluation index for this type of seismic excitation [42][43][44][45][46], energy-dissipation distributions between different components of an uncontrolled underground structure and structures with a CIS or the NSAS isolation system are shown in Figure 15. Since the central column of the Daikai subway station was severely damaged in the uncontrolled structure, after the installation of the CIS and NSAS isolation system the proportion of energy dissipated by the central column was decreased from 20.42% to 3.18% and 1.61%, respectively.…”

Section: Energy-based Damage Controlmentioning

confidence: 99%

A Novel Negative Stiffness Amplification System Based Isolation Method for the Vibration Control of Underground Structures

2020

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Underground structures can be vulnerable during strong earthquakes, and seismic mitigation systems designed for these structures are instrumental in improving multiple aspects of seismic performance. To deal with this problem, a novel isolation system is proposed for underground structures, employing the incorporation of a negative-stiffness amplification system (NSAS) and an isolator. The proposed NSAS consists of the subconfiguration of a spring with positive stiffness in parallel with a dashpot, which is then in series with a negative-stiffness device. The mechanical model and physical realization of the NSAS are presented, based on which the energy-dissipation-enhancement mechanism of NSAS is detailed. On this basis, comprehensive parameter analyses were conducted between the NSAS isolation system and a conventional isolation system. Analysis results showed that the NSAS exhibited a significant energy-dissipation-enhancement effect, in which the series connection of the negative and positive stiffnesses amplified the dashpot’s deformation for enhanced energy-dissipation capacity and efficiency. Compared with a conventional isolator, the NSAS isolation system provided the underground structure with a multiperformance and multilevel mitigation effect, particularly yielding lower responses of displacement and shear forces at the same time. More vibration energy could be dissipated by NSAS, thereby alleviating the energy-dissipation burden of underground structures.

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“…In virtue of the potential benefits of the inerter and its flexible installation approach, inerterbased control technology has been widely accepted to facilitate performance-improved control, 32,33 enhanced isolation systems, 34,35 and lightweight tuned-type control systems. 19,[36][37][38][39] A classic example of the tuned-type control system is the vibration absorber that consists of a mass-spring system without a dashpot. Patented by the Frahm, 40 the undamped vibration absorber produces a spring force equal and opposite to the disturbing force whereby the primary structure does not vibrate at all.…”

Section: Introductionmentioning

confidence: 99%

Input energy reduction principle of structures with generic tuned mass damper inerter

Zhao

Zhang

Pan

et al. 2020

Struct Control Health Monit

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The incorporation of the inerter with tuned mass damper yields the inerterbased tuned mass damper that has been verified as effective lightweight or performance-enhanced control devices. This study theoretically proved an intrinsic effect, namely, the input energy reduction, that the inerter reduces the input energy transmitted into the controlled structures from ground motion. A generic tuned mass damper inerter (GTMDI) including two separating inerters (the total inertance keeps constant) is analyzed to facilitate a universal analysis of typical inerter-based tuned mass dampers. Closed-form displacement and power equations are derived for the GTMDI to reveal and

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A tuned liquid inerter system for vibration control

Cited by 97 publications

References 36 publications

Damping enhancement principle of inerter system

Damping enhancement principle of inerter system

A Novel Negative Stiffness Amplification System Based Isolation Method for the Vibration Control of Underground Structures

Input energy reduction principle of structures with generic tuned mass damper inerter

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