A low-frequency wide-domain structural vibration suppression device with tunable control frequency domain

Abstract

A low-frequency wide-domain structure vibration reducing device with a tunable control frequency domain comprises a base body beam and a plurality of resonance bodies. The base body beam is a strip-shaped metal plate, threaded holes of a plurality of shafts are evenly distributed in the metal plate, and the multiple resonance bodies are installed in the threaded holes through the shafts in the resonance bodies. The center distance between every two adjacent resonance bodies is 8-20 cm. Vibration energy of the base body beam is transferred to the resonance bodies, so that vibration attenuationof the base body beam is achieved; through the mode of attaching magnets or counterweight sleeves to the resonance bodies, the damping or mass parameters of the resonance bodies are changed, so that the low frequency band gap is adjusted and broadened, and the low frequency vibration characteristic of the structure is improved. According to the low-frequency wide-domain structure vibration reducing device with the tunable control frequency domain, the damping characteristic of the structure is obviously improved, nonlinearity is introduced to structural rigidity, and the low frequency band gapof the structure can be further broadened. Meanwhile, structure abrasion is reduced, the service life of a whole structure system is prolonged by 10 times or above, and the low-frequency wide-domainstructure vibration reducing device has the characteristics of convenient use and small occupied space, and has a wider application range on engineering.

Description

technical field [0001] The invention relates to the field of vibration control, in particular to a vibration suppressing device for a low-frequency wide-range structure with tunable control frequency domain. Background technique [0002] As a basic structure, beam structures widely exist in engineering fields such as architecture and machinery, and their vibration control has always been the focus of researchers. Generally speaking, vibration control is divided into passive control and active control. The remarkable feature of passive control is that it does not require external energy injection. Traditional methods mainly include additional dynamic vibration absorbers, viscoelastic damping layers, etc., but are limited by installation space and other restrictions, and are difficult to control. Realizes a strong vibration damping effect over a wide frequency band. Active control requires external energy injection, which has the disadvantages of poor stability and high cost....

AI Technical Summary

Problems solved by technology

[0005] At present, the research on the design of local resonance phononic crystals is mostly based on fixed parameter structures, and there is no detailed discussion on the modulation of resonator parameters, especially the influence of damping parameter modulation on the structural elastic wave band gap, which will seriously limit the local resonance type. The frequency band of action of phononic crystal

Harbin Institute of Technology disclosed a grid plate based on the local resonance type phononic crystal theory in the invention patent with the announcement number CN 104141720 A. The parameters of the grid plate are fixed, and it can only suppress phononic crystals in a specific frequency range. Structural vibration, so the scope of application is extremely limited

The National University of Defense Technology of the Chinese People's Liberation Army discloses a local resonance phononic crystal beam structure with super damping characteristics in the invention patent with the notification number CN 107701635 A. The damping characteristics of this invention are provided by a rubber strip, but It takes up a lot of space and cannot realize bandgap frequency modulation, so it also has great limitations in the vibration reduction of high-precision equipment such as aircraft and automobile engines.

Hsin-Haou Huang of National Taiwan University published a paper in the Journal of the Mechanics and Physics of Solids in 2011 to propose a mechanical model of a phononic crystal with a local resonator, but this model can only adjust the bandgap by tuning the stiffness of the resonator

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