Particle damper with ferromagnetic end cap coupled to electromagnetic field at one end and its vibration reduction method for vibrating structures

Abstract

The invention discloses a coupled electromagnetic field particle damper with a ferromagnetic end cover additionally arranged at one end and a vibration reduction method of the particle damper for a vibration structure. The coupled electromagnetic field particle damper comprises a non-ferromagnetic cavity with openings in two ends, the ferromagnetic end cover is installed at one end of the non-ferromagnetic cavity, a non-ferromagnetic end cover is installed at the other end of the non-ferromagnetic cavity, the ferromagnetic end cover and the non-ferromagnetic end cover seal the non-ferromagnetic cavity, ferromagnetic particles are arranged in the non-ferromagnetic cavity, and the outer side of the non-ferromagnetic cavity is wound with a coil. When the particle damper is powered on, an electromagnetic field generated by a spiral pipe will magnetize the ferromagnetic particles and the ferromagnetic end cover, the ferromagnetic particles interacts with the electromagnetic field after being magnetized to increase the relative movement between the particles, and the purpose of increasing energy consumption is achieved; in the space weightlessness environment, the ferromagnetic end cover can apply whole one-way force on all the ferromagnetic particles, positive pressure between the particles is increased, and therefore the probability of collision between the particles and friction energy consumption are increased, and the vibration reduction function of particle damping is improved; under the condition of large inertia force, a good vibration reduction effect is also achieved.

Description

technical field [0001] The invention belongs to the field of vibration control in aerospace engineering and rotating machinery, and in particular relates to a particle damper with a ferromagnetic end cover coupled to an electromagnetic field at one end and a vibration reduction method for a vibration structure. Background technique [0002] Particle damping is to fill metal or non-metallic particles into a cavity structure according to a certain filling ratio, and consume the kinetic energy of the system through the inelastic collision, friction and momentum exchange between particles and between particles and the inner wall of the cavity, thus To achieve the purpose of vibration reduction. At present, the research on particle damping is mainly concentrated in the conventional gravity environment, and the influence of various parameters of particle damping on the vibration reduction characteristics is discussed. Moreover, in recent years, scholars have also evolved and deve...

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Problems solved by technology

[0004] In order to overcome the problem that particle damping is difficult to apply in the above-mentioned large inertial force and weightless environment, some scholars at home and abroad have explored it.

Someone has studied the motion law of the granular material of the particle damper in a weightless environment, and proposed adding a disturber 10 (cross-shaped blade) to increase the movement of the particles and improve the vibration reduction effect of particle damping. See figure 1 , but it is difficult to fix the perturbator in the cavity 9; and after vibrating for a period of time in a weightless environment, the particles may be suspended and distributed in the middle of the two cavities divided by the perturbator, which may cause the perturbator to fail to achieve the desired effect

Some people have also discussed particle damping under rotating conditions, and discussed the drilling direction and aspect ratio to improve the vibration reduction effect of particle damping in this environment, but this method is also limited to low rotation speeds. The parameters of the holes at high speeds have little effect on the vibration reduction effect of particle damping

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