Near-zero stiffness vibration isolation system comprising combined magnetic negative stiffness mechanism

Abstract

The invention discloses a near-zero stiffness vibration isolation system comprising a combined magnetic negative stiffness mechanism, and relates to the field of vibration isolation. The near-zero stiffness vibration isolation system comprises a base, a load platform, a positive stiffness unit and a combined magnetic negative stiffness unit, wherein the positive stiffness unit and the combined magnetic negative stiffness unit are located between the base and the load platform, the positive stiffness unit and the combined magnetic negative stiffness unit are connected in parallel, the positive stiffness unit comprises an elastic element with a positive stiffness characteristic, the elastic element is arranged between the base and the load platform, the combined magnetic negative stiffness unit comprises at least one repulsive force type magnetic negative stiffness mechanism and at least one suction force type magnetic negative stiffness mechanism, and the repulsive force type magnetic negative stiffness mechanism and the suction force type magnetic negative stiffness mechanism are connected in parallel. According to the near-zero stiffness vibration isolation system, the combined type structural design is adopted, parameters of the repulsive force type magnetic negative stiffness mechanism and the suction force type magnetic negative stiffness mechanism can be conveniently adjusted and matched, the effective working range and stiffness linearity of the vibration isolation system can be greatly improved, and the vibration isolation effect that the comprehensive stiffness is close to zero and the work is stable is achieved in a wide working area.

Description

technical field [0001] The invention relates to the field of vibration isolation, in particular to a near-zero stiffness vibration isolation system including a combined magnetic negative stiffness mechanism. Background technique [0002] Vibration problems generally exist in various fields of industrial production and engineering. With the development of various mechanical equipment towards high speed, high precision and high stability, their requirements for vibration are becoming more and more stringent. It is necessary to use the vibration isolator to isolate the transmission of the vibration excitation of the equipment to its installation base, or to isolate the transmission of the vibration of the installation base to the equipment. [0003] Low vibration isolation stiffness and high load-bearing capacity are the goals that are constantly pursued in the design of vibration isolators. In conventional linear stiffness vibration isolation systems, the two are usually contr...

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Problems solved by technology

[0004] However, the negative stiffness nonlinear characteristics of the above two magnetic negative stiffness mechanisms are obvious, and it is difficult for the overall stiffness of the vibration isolator to approach zero and remain stable within a relatively wide working stroke, that is, the overall stiffness of the vibration isolator is difficult to approach zero and the stable area is narrow In addition, due to the narrow negative stiffness stability region of this type of mechanism, its installation and adjustment are often particularly difficult, causing the actual working area of ​​the vibration isolation system to deviate from the designed low stiffness area, further deteriorating the actual vibration isolation performance

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