Active Metadamping: A phenomenon of damping enhancement in metamaterial via feedback control

Article Instruments & Instrumentation

Uncovering low frequency band gaps in electrically resonant metamaterials through tuned dissipation and negative impedance conversion

J. Callanan et al.

Summary: A new class of electromechanically coupled metamaterial is introduced, which can realize vibration control through magnetic field interactions and exhibit a highly tunable vibration band gap with adjustable resonant circuit parameters.

SMART MATERIALS AND STRUCTURES (2022)

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Article Mechanics

Tunable dissipation in elastic metamaterials via methodic reconfiguration of inertant mechanical networks

A. Aladwani et al.

Summary: Elastic metamaterials offer transformative solutions in structural mechanics by exploiting their unique capabilities in wave propagation and control. This study comprehensively analyzes the influence of different configurations of a hierarchical mechanical network on the response, bandgap characteristics, and emergent dissipation. The authors demonstrate the significant roles played by network components, architecture, and damping placement using examples of locally resonant flexural beams. The presented framework enables a direct comparison with finite metamaterial counterparts and provides insights for tailoring efficient damped responses for specific applications.

MECCANICA (2022)

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Article Physics, Multidisciplinary

Enhanced attenuation band in active 2D mass-in-mass metamaterial using static output feedback

Ajinkya Baxy et al.

Summary: Active feedback control is implemented in a 2D mass-in-mass metamaterial to widen the attenuation bandwidth by reducing the displacement of the outer mass. The model is validated and it is found that the damping phenomenon can occur even in an undamped system due to the control. Effective mass analysis and energy dissipation mechanism shed light on the physics underlying the attenuation phenomena.

WAVES IN RANDOM AND COMPLEX MEDIA (2022)

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Article Acoustics

Metadamping in inertially amplified metamaterials: Trade-off between spatial attenuation and temporal attenuation

Mahmoud I. Hussein et al.

Summary: Metadamping, the enhanced or diminished intrinsic dissipation in a material, can be achieved by designing the internal structure of the material. By coupling inertially amplified metamaterial with locally resonant metamaterial, a trade-off between spatial attenuation and temporal attenuation can be achieved within a certain range.

JOURNAL OF SOUND AND VIBRATION (2022)

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Article Mechanics

Strategic Damping Placement in Viscoelastic Bandgap Structures: Dissecting the Metadamping Phenomenon in Multiresonator Metamaterials

A. Aladwani et al.

Summary: The study investigated viscoelastic metadamping in one-dimensional multibandgap metamaterials, finding that strategic damping placement in individual resonators plays a key role in shaping intermediate dispersion branches and dictating the primary and secondary frequency regions of interest, where attenuation is most required.

JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME (2021)

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Article Physics, Applied

Metadamping enhancement and tunability via scissor-like electromechanical metamaterials

Hasan Al Ba'ba'a et al.

Summary: This study reports a novel electromechanical metamaterial called SEMM, which utilizes its electromechanical resonant effects to achieve enhanced and tunable damping properties. The scissor-like structure in SEMM amplifies the damping ratio through a displacement amplification mechanism, improving vibration mitigation. By quantifying the relative dissipation performance based on complex band structures, SEMM demonstrates higher damping performance compared to traditional systems through numerical verification and analysis. The electromechanical nature of piezoelectric material in SEMM allows for convenient tuning of the damping properties by adjusting the piezoelectric shunting circuit.

JOURNAL OF APPLIED PHYSICS (2021)

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Article Acoustics