Magnetic lead screw type eddy current damper with negative stiffness nonlinear energy trap
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A non-linear energy trap, magnetic screw technology, applied in protective buildings/shelters, building components, shockproof, etc., can solve the problems of narrow vibration damping frequency band, large static elongation of spring, and large physical quality of TMD.
Active Publication Date: 2021-01-01
湖南省潇振工程科技有限公司
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[0007] The invention aims to improve the light weight and durability level of traditional TMD, improve the robustness of the system, and solve the problem of excessive physical mass of traditional TMD, excessive static elongation of spring, na...
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Embodiment 1
[0062] Such as figure 2 , 4 , 6 and 8 show a vertically tuned mass magnetic screw type inertial eddy current damper with negative stiffness nonlinear energy well, including spring mass system, inertial mass system, eddy current damping system, negative stiffness system and support system.
[0063] The spring mass system includes a spring (3) and a counterweight (5), the counterweight (5) is in the shape of a cuboid, and a hole larger than the diameter of the guide rod (2) is left on it, so that the counterweight (5) ) is sleeved on the guide rod (2) and can move linearly along it; the spring (3) is sleeved on the guide rod (2), one end is fixed with the counterweight (5), and the other end is connected with the outer frame (1) or the support The bracket (4) is consolidated.
[0064] The inertial mass system includes a flywheel (6), a magnetic screw nut pair (7) and a magnetic suspension thrust bearing (8). The flywheel (6) is sleeved on the magnetic lead screw (72) and th...
Embodiment 2
[0069] Such as figure 1 , 3 , 5 and 7 show a vertically tuned mass magnetic field modulation type magnetic screw type inertial eddy current damper with negative stiffness nonlinear energy well, including spring mass system, inertial mass system, eddy current damping system, negative Stiffness system and support system.
[0070] The spring mass system includes a spring (3) and a counterweight (5), the counterweight (5) is in the shape of a cuboid, and a hole larger than the diameter of the guide rod (2) is left on it, so that the counterweight (5) ) is sleeved on the guide rod (2) and can move linearly along it; the spring (3) is sleeved on the guide rod (2), one end is fixed with the counterweight (5), and the other end is connected with the outer frame (1) or the support The bracket (4) is consolidated.
[0071] The inertial mass system includes a flywheel (6), a magnetic screw nut pair (7), a modulation ring (12) and a magnetic suspension thrust bearing (8). The flywheel...
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Abstract
The invention relates to a magnetic lead screw type eddy current damper with a negative stiffness nonlinear energy trap. The magnetic lead screw type eddy current damper comprises a spring mass system, an inertia mass system, an eddy current damping system, a negative stiffness system and a supporting system. The spring mass system comprises a spring and a balancing weight, the inertia mass systemcomprises a flywheel, a magnetic lead screw nut pair and a magnetic suspension thrust bearing, the eddy current damping system comprises a straight permanent magnet, a conductor plate and back iron,the supporting system comprises a guide rod, a supporting bracket and an outer frame, and the negative stiffness system comprises a synonym permanent magnet group and/or a homonymous permanent magnetgroup. According to the damper, the inerter principle is introduced, physical balance weight is reduced, the mass ratio of the device is increased, and meanwhile the spring net elongation of a low-frequency structure controlled by the device is reduced. The negative stiffness nonlinear energy trap element is introduced, and resonance energy can be captured in a wide frequency range. By adopting the magnetic lead screw nut pair, the friction between a lead screw and a nut is eliminated, and the working efficiency is improved. Meanwhile, the magnetic suspension thrust bearing is used cooperatively to ensure that the flywheel is suspended in a flywheel chamber to work normally.
Description
technical field [0001] The invention belongs to the field of vibration control devices for engineering structures, and in particular relates to a magnetic screw type eddy current damper with negative stiffness nonlinear energy wells. Background technique [0002] Structural vibration reduction using a tuned mass damper (TMD) is a kind of passive control technology for structural vibration. It is widely used in the field of engineering structures. Installing it in a vibrating bridge structure or high-rise building structure has a very obvious effect on structural vibration. inhibitory effect. [0003] However, when the stiffness of the TMD spring element vibrates at low frequencies, its theoretical stiffness decreases significantly at higher frequency bands, and its static elongation of the spring is very large, which cannot meet the use requirements. In order to solve the problem of the static elongation of the TMD spring, an inerter is introduced to combine with it. One of...
Claims
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