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Nonlinear energy trap reduction based on filtering

A technology of nonlinear energy wells and shock absorbers, which can be used in anti-seismic, infrastructure engineering, non-rotational vibration suppression, etc., can solve problems such as lack of stability of the effect, achieve simple construction, solve unstable shock absorption, and eliminate uncertainty Effect

Pending Publication Date: 2018-03-20
INST OF ENG MECHANICS CHINA EARTHQUAKE ADMINISTRATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The effect of the energy well in reducing the narrow-band excitation is remarkable, but its effect in reducing the broadband excitation is not stable. Therefore, a shock absorber is urgently needed to solve the shortcomings of the energy well under the broadband excitation, and the input ground motion becomes Harmonic excitation of a single frequency

Method used

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  • Nonlinear energy trap reduction based on filtering
  • Nonlinear energy trap reduction based on filtering
  • Nonlinear energy trap reduction based on filtering

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specific Embodiment approach 1

[0024] Specific embodiment one: combination Figure 1 to Figure 5 To illustrate this embodiment, the filter-based nonlinear energy trap shock absorber in this embodiment includes a supporting device 1, a mass body 2, a spring damping unit 3, and a filter system 4. The supporting device 1 is a circular tray structure with a circular The circular pallet structure is formed by connecting the bottom plate 5 and the ring plate 6. The circular pallet structure is provided with a top plate 7. The mass body 2 is located inside the supporting device 1, and the mass body 2 is surrounded by a plurality of spring damping units 3 and the circular shape. The annular side walls of the tray structure are connected, and a filter system 4 is installed under the bottom plate 5 of the supporting device 1. With this arrangement, the filter-based nonlinear energy trap shock absorber can be installed between the bottom and the top slab of the building and electrical equipment, or it can be installed a...

specific Embodiment approach 2

[0025] Specific implementation manner two: combination Figure 1-Figure 6 To illustrate this embodiment, the filter system 4 of the filter-based nonlinear energy trap shock absorber of this embodiment includes a lower fixing seat 8, a middle sliding seat 9 and an upper sliding seat 10. The lower fixing seat 8 and the upper The sliding seat 10 is provided with an inner concave arc surface 12, the upper and lower surfaces of the middle sliding seat 9 have arc surfaces 13 protruding outward, the middle sliding seat 9 and the lower fixing seat 8 and the upper sliding seat 10 Cooperate with installation. So set up, any unit in the filter system, through the cross-sectional view, the filter system is composed of three parts, the lower fixing seat 8, the middle sliding seat 9 and the upper sliding seat 10, the lower fixing seat 8 and the upper sliding seat 10 have The lower arc surface and the upper arc surface, the middle sliding seat 9 is an arc surface protruding outward from the ...

specific Embodiment approach 3

[0029] Specific implementation mode three: combination Figure 1-Figure 6 To describe this embodiment, there is at least one filter system 4 in the filter-based nonlinear energy trap shock absorber of this embodiment.

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Abstract

The invention provides a nonlinear energy trap reduction based on filtering and belongs to the technical field of shock isolation and absorption control. The present invention is based on the gravitypendulum basic filtering system, completely eliminates the uncertainty of the seismic oscillation, and changes the seismic oscillation excitation into single frequency excitation, thereby solving theproblem of instability of the energy trap. The invention comprises a supporting device, a mass body, a spring damping unit and a filtering system. The supporting device is a circular tray structure. The circular tray structure is formed by connecting a bottom plate and a ring plate, and a top plate is arranged on the circular tray structure. The mass body is located inside the supporting device. The surrounding of the mass body is connected with the annular sidewall of the circular tray structure through a plurality of spring damping units. A filter system is installed under the floor of the supporting device. Based on the principle of gravity pendulum, the present invention designs a basic filtering system, completely solves the shortcomings of energy traps under wide-frequency excitation, and transforms input seismic oscillation into single-frequency harmonic excitation after passing through a filtering system.

Description

Technical field [0001] The invention relates to a passive shock absorption device, belonging to the technical field of shock isolation and shock absorption control. Background technique [0002] Nonlinear energy sink (NES) is a non-linear passive vibration absorber that can achieve target energy transfer (TET). NES has two characteristics in suppressing the free vibration of the structure: First, vibration The suppression efficiency is related to the magnitude of the input energy; second, the realization of the target energy transfer requires that the mass ratio of NES to the main structure is greater than a certain value. [0003] The energy trap has a significant effect in reducing narrow-band excitation, and its effect in reducing broadband excitation is not stable. Therefore, there is an urgent need for a shock absorber to solve the shortcomings of energy traps under wide-band excitation, and the input ground motion will become Harmonic excitation of a single frequency. Summa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04B1/98E04H9/02E02D31/08F16F15/04F16F15/02
CPCF16F15/02F16F15/04E02D31/08E04H9/02
Inventor 戴君武柏文杨永强
Owner INST OF ENG MECHANICS CHINA EARTHQUAKE ADMINISTRATION
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