Energy Transfer to High-Frequency Modes of a Building due to Sudden Change in Stiffness at Its Base

In this computational study, a light-weight dynamic device is investigated for passive energy reversal from the lowest frequency mode to the high frequency modes of a large-scale frame structure for rapid shock mitigation. The device is based on the single-sided vibro-impact mechanism. It has two functions for passive energy transfer: a nonlinear energy sink (NES) for local energy dissipation and an energy pump to high frequency modes where a significant amount of the shock energy is rapidly dissipated. As a result, a significant portion of the shock energy induced into the linear dynamic structure can be passively reversed from the lowest frequency mode to the high frequency modes and rapidly dissipated by their modal damping. The amount of the energy dissipated by the modal damping of the high frequency modes can be controlled by the amount of inherent damping in the device. Ideally, the device can passively reverse up to 80% of the input shock energy from the lowest frequency mode to the high frequency modes when its damping is assumed to be zero and its impact coefficient of restitution is equal to unity. The shock energy redistribution between this device and the high frequency modes is found to be efficient for rapid shock mitigation in the considered 9-story dynamic structure.

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A Review of: “Giant Resonances: Fundamental High-Frequency Modes of Nuclear Excitation, by M. N. Harakeh and A. van der Woude. Oxford University Press, Oxford, UK, 200 1”

Nuclear Physics News ◽

10.1080/10506890308232705 ◽

2003 ◽

Vol 13 (3) ◽

pp. 29-30

Author(s):

P. F. Bortignon

Keyword(s):

High Frequency ◽

Nuclear Excitation ◽

Giant Resonances ◽

Oxford University ◽

High Frequency Modes ◽

Oxford University Press

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High frequency modes meshfree analysis of Reissner–Mindlin plates

Journal of Science Advanced Materials and Devices ◽

10.1016/j.jsamd.2016.08.005 ◽

2016 ◽

Vol 1 (3) ◽

pp. 400-412 ◽

Cited By ~ 3

Author(s):

Tinh Quoc Bui ◽

Duc Hong Doan ◽

Thom Van Do ◽

Sohichi Hirose ◽

Nguyen Dinh Duc

Keyword(s):

High Frequency ◽

Meshfree Analysis ◽

High Frequency Modes

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The wireless energy transfer (WET) using ultra high frequency (UHF) for human body implant recharging

E3S Web of Conferences ◽

10.1051/e3sconf/201843101027 ◽

2018 ◽

Vol 43 ◽

pp. 01027

Author(s):

Fahmy Rinanda Saputri ◽

Sunarno ◽

Memory Motivanisman Waruwu ◽

Rony Wijaya

Keyword(s):

Energy Transfer ◽

Human Body ◽

High Frequency ◽

Wireless Energy Transfer ◽

Ultra High Frequency ◽

Size And Shape ◽

Uhf Band

The wireless energy transfer (wet) is widely used in many fields. In particularly for medical, this technique can be implemented to an electronic human body implant recharging. The possible size and shape of the receiver antenna in the experiment before still become a problem. Using Yagi-Uda model antenna for the transmitter unit in ultra-high frequency (UHF) band, this paper refers to design a receiver antenna for implemented as a human implant recharging. The receiver antenna has successfully designed in minimal with its size and shape of the designed antenna is about 1.44 cm3.

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