Quasi-zero stiffness vibration isolation system

Abstract

The invention relates to the technical field of mechanical vibration isolation, and discloses a quasi-zero stiffness vibration isolation system. The system includes a negative stiffness module and multiple positive stiffness modules connected in parallel with the negative stiffness module. The negative stiffness module is arranged at a center position of a geometric figure arranged by the multiplepositive stiffness modules. The quasi-zero stiffness vibration isolation system is a vibration isolation system with large load and low natural frequency. The single negative stiffness module and themultiple positive stiffness modules are used in parallel, which makes the vibration isolation system maintain low vertical natural frequency and ensures the stability of the vibration isolation system. The negative stiffness module is arranged at the center of the geometric figure arranged by the multiple positive stiffness modules, and so effect of negative stiffness generated by the negative stiffness module is evenly distributed to connection points of the positive stiffness modules, thereby reducing the vertical stiffness of the vibration isolation system. However, when the vibration isolation system rotates, the negative stiffness module does not affect the rotational stiffness of the vibration isolation system, and so the vibration isolation system can maintain high rotational stiffness.

Description

technical field [0001] The present invention is in the technical field of mechanical vibration isolation, in particular to a quasi-zero stiffness vibration isolation system. Background technique [0002] The general passive quasi-zero stiffness vibration isolator mainly solves the contradiction between the bearing capacity in the direction of gravity and the vibration isolation effect, that is, a large load requires a large stiffness, but the large stiffness makes the vibration isolation effect worse, so the quasi-zero stiffness vibration isolation appears. It can not only have a large bearing capacity, but also provide a small supporting rigidity in the working area. [0003] However, in practical engineering applications, it is rare to use only one vibration isolator to support the object to be isolated. Generally, three or more isolators are used to support the object (or equipment) to be isolated. multiple installation positions to make the vibration-isolated object rea...

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Problems solved by technology

[0004] The existing vibration isolation system composed of multiple quasi-zero stiffness vibration isolators, such as Figure 7 As shown, it has a good effect in reducing the stiffness in the vertical direction to reduce the transmission of vibration, but the stiffness in the rotation direction along the horizontal X and Y axes is also reduced to a very low level, making it impossible to effectively counteract the force from the horizontal direction. It is difficult to maintain the stability of the equipment when the overturning force that makes the object rotate along the XY axis is applied, that is, the vibration isolation system composed of multiple quasi-zero stiffness vibration isolators is likely to cause equipment overturning accidents

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