A metamaterial for ultra-low frequency torsional vibration damping
A technology of torsional vibration reduction and metamaterials, which is applied in the direction of rotation vibration suppression, spring/shock absorber functional characteristics, vibration suppression adjustment, etc., can solve the problems of difficult to achieve low natural frequency of local resonance cells and difficult vibration attenuation
Active Publication Date: 2021-04-23
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology
However, limited by the stiffness of the middle layer, the low natural frequency of the local resonance cell is difficult to achieve
Therefore, it is still very difficult to attenuate the vibration of low frequency and ultra-low frequency
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[0018] The following combination Figure 1-3 The structure and working principle of the ultra-low frequency torsional vibration damping metamaterial proposed by the present invention are described in detail.
[0019] Such as figure 2 As shown in , an ultra-low frequency torsional vibration damping metamaterial includes multiple cells arranged at equal intervals along the axis, such as figure 1 and image 3 As shown, the unit cell includes an annular shell 12, a first tile-shaped permanent magnet group, a second tile-shaped permanent magnet group, a flexible rod 10, a resonant mass 11 and a leaf spring group, and the first tile-shaped permanent magnet group The magnet group includes a first tile-shaped permanent magnet 2, a second tile-shaped permanent magnet 4, a third tile-shaped permanent magnet 7 and a fourth tile-shaped permanent magnet 9, and the first tile-shaped permanent magnet 2, the second tile-shaped permanent magnet The magnet 4, the third tile-shaped permanent...
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The invention discloses an ultra-low frequency torsional vibration damping metamaterial, which includes a plurality of cells arranged at equal intervals along the axis direction, and the cells include a ring-shaped shell and a first tile-shaped permanent magnet. group, a second tile-shaped permanent magnet group, a flexible rod, a resonant mass block, and a leaf spring group, the first tile-shaped permanent magnet group includes a plurality of outer-ring tile-shaped permanent magnets, and the outer-ring tile-shaped permanent magnets are along the shell The circumferential directions are respectively connected with the inner side wall of the shell, the second tile-shaped permanent magnet group includes a plurality of inner-ring tile-shaped permanent magnets, and the circumference of the inner-ring tile-shaped permanent magnets is embedded in the resonant mass block. The permanent magnets of the first tile-shaped permanent magnet group and the second tile-shaped permanent magnet group form a pair of magnetic poles respectively. The resonant mass block is installed on a flexible rod, and the resonant mass block is connected to the shell through a leaf spring set. The invention can realize ultra-low local resonance band gap, thereby realizing suppression and attenuation of low-frequency and ultra-low-frequency torsional vibration.
Description
technical field [0001] The invention belongs to the field of vibration-damping metamaterials, and specifically discloses an ultra-low-frequency torsional vibration-damping metamaterial. [0002] technical background [0003] The development of traditional vibration reduction technology has been relatively mature. With the continuous development of metamaterial technology, new vibration suppression and elimination methods are emerging. The vibration reduction mechanism of vibration-damping metamaterials is realized through its bandgap characteristics. Within the bandgap frequency range, the transmission of mechanical waves will be absorbed and blocked, thereby achieving vibration reduction. The formation mechanism of the band gap includes the Bragg scattering mechanism and the local resonance mechanism. The band gap formed by Bragg scattering is closely related to the unit cell size, and its wavelength suppression is in the same order of magnitude as the unit cell size. Theref...
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IPC IPC(8): G10K11/16F16F15/14F16F15/10F16F6/00
CPCF16F6/005F16F15/10F16F15/14F16F15/1414F16F2228/04F16F2238/022
Inventor 周振华刘志强刘鑫唐驿宇戴志辉周民瑞
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY