Partial-zero-stiffness vibration isolator

Abstract

The invention provides a partial-zero-stiffness vibration isolator. By means of arrangement of a negative stiffness structure, according to the principle that positive stiffness and negative stiffnesscounteract, the stiffness, at the balance position, of the system approaches to zero, so that the inherent frequency of the system is greatly lowered; and in this way, the vibration isolation capacity is improved, low-frequency vibration isolation and ultra-low-frequency vibration isolation are achieved. The partial-zero-stiffness vibration isolator can bear large weight and can effectively lowerthe dynamic stiffness of the system, the inherent frequency of the whole system approaches to zero too, and therefore the partial-zero-stiffness vibration isolator is quite suitable for low-frequencyvibration isolation and even ultra-low-frequency vibration isolation. Compared with other vibration isolators, a cross arm structure, T-shaped sliding plates and guide rails can guarantee that extension and retraction of an extension spring are on the same horizontal line, so that the stability of a negative stiffness mechanism is guaranteed, and the unstable phenomenon existing when a main spring is compressed is avoided. The negative stiffness structure can be adjusted through fine movement of the T-shaped sliding plate on the guide rail, and meanwhile the height of the lower end face of the main spring can be adjusted in the vertical direction so as to be adapted to objects of different masses.

Description

technical field [0001] The invention relates to the field of vibration isolation devices, in particular to a quasi-zero stiffness vibration isolator. Background technique [0002] With the development of engineering technology and the continuous improvement of people's living standards, more and more people have started research on equipment vibration problems. As small as the bumps of a car driving on the road, as large as the vibration of a spacecraft in the air, these vibrations will have a certain negative impact on machinery and equipment. For example, it affects the operating accuracy of the equipment, aggravates its wear, and shortens the service life of the structure. Vibration can also lead to deformation and damage of some structures, aircraft may disintegrate due to wing vibration, bridges may collapse due to resonance, and so on. So how do we suppress these negative vibrations? According to the vibration theory, when the vibration frequency of the external exci...

AI Technical Summary

Problems solved by technology

Therefore, the linear vibration isolation system needs to reduce its own natural frequency to isolate low-frequency excitation, but it cannot overcome the trade-off between stiffness and load-bearing mass, so it cannot be realized

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