Negative stiffness adjustable zero stiffness vibration isolation device and application method thereof

Abstract

The invention discloses a negative stiffness adjustable zero stiffness vibration isolation device and an application method thereof, wherein the negative stiffness adjustable zero stiffness vibrationisolation device comprises a bearing table, a positive stiffness mechanism is arranged at the lower side of the bearing table, a plurality of adjustable negative stiffness mechanisms which are centrosymmetrically arranged are connected around the bearing table, the positive stiffness mechanism comprises a vertical elastic element for supporting the bearing table, and the adjustable negative stiffness mechanism comprises a horizontal elastic element for applying horizontal acting force to the bearing table; and the application method comprises the steps of installing a bearing object on the bearing table and then adjusting each height adjusting mechanism to enable the horizontal elastic element to be horizontal. The negative stiffness adjustable zero stiffness vibration isolation device canflexibly adjust the negative stiffness according to the bearing at any time, so that the negative stiffness can be adjusted according to the actual situation after bearing, the negative stiffness adjustable zero stiffness vibration isolation device can be adjusted to ensure that the negative stiffness adjustable zero stiffness vibration isolation device is in an ideal state that the dynamic stiffness is close to zero in a static load state after field installation, the failure of a vibration isolation system can be avoided, and the negative stiffness adjustable zero stiffness vibration isolation device has the advantages of simple structure, easiness in processing, convenience in loading and unloading, reasonable design and easiness in adjustment.

Description

Technical field [0001] The invention relates to vibration control technology, in particular to a negative stiffness adjustable quasi-zero stiffness vibration isolation device and an application method thereof. Background technique [0002] The traditional linear vibration isolation method is effective only when the excitation frequency is greater than √2 times the fixed frequency of the vibration isolation system. If low frequency vibration is to be isolated, the system stiffness must be low, which will affect the installation stability of the mechanical system. Therefore, low-frequency vibration isolation is still a major problem in the field of vibration engineering. On the basis of the traditional vibration isolator, a negative stiffness mechanism / structure is introduced to form a quasi-zero stiffness vibration isolator, which can not only bear the weight of the equipment without large deformation, but also has extremely low dynamic stiffness near the static equilibrium positi...

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Problems solved by technology

[0003] In the actual use process, after determining the mass to be carried by the quasi-zero-stiffness vibration isolation structure, the parameters such as the stiffness and position size of the elastic elements in the structure will be determined through calculations. Once determined, if the design load-bearing mass occurs If the actual static equilibrium position of the quasi-zero stiffness realization mechanism deviates from the ideal static equilibrium position determined during design, the horizontal elastic Components cannot remain in a nearly horizontal position, nor can their compressed length be guaranteed to be equal to the preset value

Through the analysis, it can be known that when the static equilibrium position of the quasi-zero stiffness mechanism deviates from the preset point, the quasi-zero stiffness mechanism cannot guarantee that the dynamic stiffness is close to zero. The zero-stiffness vibration isolation structure fails, affecting the stability of the equipment

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