A New Type of Inerter with Easily Adjustable Inertance and Superior Adaptability: Crank Train Inerter

Xu, Yongfu; Tai, Yu‐ji; Chen, Chao; Wang, Wen-xi; Chen, Zhengqing

doi:10.1061/jsendh.steng-12154

Cited by 5 publications

(2 citation statements)

References 33 publications

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“…Apart from CVTs, the parameter β of a flywheel-based inerter can be controlled by other means of variable transmission. For example, Tai et al (2023) presented the "crank train inerter", where the length of the crank is altered to control the inertance. The incorporation of mechanical variable transmission systems such as CVT, CVP, and planetary variators offers reliable control of inertance for IVII-type semi-active inerters.…”

Section: Ivii-type Semi-active Inerters Featuring Controllable β Para...mentioning

confidence: 99%

“…Simulations conducted using analytical methods demonstrated that the semi-active inerterbased vibration isolator exhibited a broader isolation frequency band and superior reduction in transmissivity and dynamic displacement compared to passive isolators under sinusoidal excitations. Tai et al (2023) presented a novel "Crank Train Inerter" (CTI) configuration with variable inertance for structural vibration isolation. Simulations and experimental tests showed promising vibration control performance under frequency response tests and in base-isolated structures, with reduced amplitude-frequency response and inter-story drift ratio as well as isolation layer deformations.…”

Section: Vibration Isolators (Vis)mentioning

confidence: 99%

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Semi-active inerters: a review of the literature

Tran,

Jin,

Deng

et al. 2024

Front. Mater.

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The inerter was introduced as a mechanical counterpart to the electrical capacitor, completing the force-current analogy. This is a one-port, two-terminal device in which the equal and opposite forces exerted at its terminals are proportional to the relative acceleration between them. Within this relationship, the “inertance” is the coefficient of proportionality and carries the unit of mass. This implies that the inerter can exert an inertial force at its terminals, effectively representing a virtual mass. Due to these properties, inerters have gained popularity, finding applications as components of vibration control systems and energy harvesters. Derived from passive inerters, semi-active inerters are integrated with active control systems to regulate their inertance. Since their introduction, semi-active inerters have been pivotal in situations demanding active monitoring of natural frequency or control force, generally outperforming their passive counterparts. While numerous significant reviews on passive inerters and their applications have been published in respected journals, dedicated literature reviews on semi-active inerters remain scarce. This review seeks to bridge this gap, offering a comprehensive literature review on semi-active inerters and highlighting research challenges and opportunities. Given the novelty of semi-active inerters, they present a fascinating area of study.

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Section: Ivii-type Semi-active Inerters Featuring Controllable β Para...mentioning

confidence: 99%

Section: Vibration Isolators (Vis)mentioning

confidence: 99%

Semi-active inerters: a review of the literature

Tran,

Jin,

Deng

et al. 2024

Front. Mater.

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Theoretical study of a novel resettable‐inertia damper: Dynamic modeling, equivalent linearization, and performance assessment

Liang,

Yu,

Wei

et al. 2024

Earthq Engng Struct Dyn

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To passively achieve an inertial device with unidirectional force transmission similar to Bang Bang control, this study introduces a novel energy dissipation device known as the resettable‐inertia damper (RID). The ingenious motion principles of the RID, encompassing a rack‐and‐pinion, bevel gear commutation system, speed transmission, and eddy current damping, are elucidated in detail. In particular, a unidirectional rotational flywheel within the device selectively engages when the primary structure reciprocates. The physical mass of the flywheel undergoes conversion into an amplified inertia through the rack‐and‐pinion mechanism, which enables the enhancement of damping effects coupling the flywheel rotation and eddy current configuration. A coupled multibody dynamic model, combining the clutching effect, the flywheel inertia, and the rotational damping, is formulated to analyze the system with RID (RIDS). Currently, an analysis of the hysteretic behaviors of RID is carried out. To facilitate the design and evaluation of the performance of RIDS, an equivalent linearization method is proposed for RIDS. The feasibility of this simplified method is validated under harmonic excitation. Additionally, the study examines the performance of equivalent linear systems (ELSs) and RIDS under natural ground motions and stochastic stationary excitation in peak and variance responses levels, respectively. Comparison of RID with traditional inerter shows that RID can achieve a more pronounced control with less force transferred to the structure and with the potential to recover vibration energy, highlighting its unique advantages.

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