Active and passive vibration isolation platform and method based on electromagnetic negative stiffness in space with six degrees of freedom

Abstract

The invention discloses a platform and a method of main and passive vibration isolation in space six-degree of freedom based on electromagnetic negative stiffness. The platform comprises a load platform, a foundation platform and six electromagnetic negative stiffness vibration isolators, wherein the six electromagnetic negative stiffness vibration isolators are fixed between the load platform andthe foundation platform through a connecting piece; the two adjacent vibration isolators are perpendicular to each other in the axial direction, and the load platform has six-degree of freedom relative to the foundation platform; each electromagnetic negative stiffness vibration isolator comprises an actuating rod, an upper shell, a lower shell, a combined disc spring, a base, a bottom supportingrod and two sets of excitation devices, wherein the actuating rod is fixedly connected with the upper shell through a cross beam spring piece, a strain sensor is pasted on the cross beam spring piece, and is used for detecting the axial displacement of the actuating rod; each vibration isolator can realize active control of equivalent electromagnetic negative rigidity, so that the vibration isolation platform is of a positive and negative stiffness parallel structure in six-degrees of freedom, the vibration isolators have relatively low resonance frequency and a very wide vibration isolationfrequency band, so that micro-vibrations in the space six-degree of freedom direction can be effectively inhibited. According to the platform and the method, the platform and the method of the main and passive vibration isolation in the space six-degree of freedom based on the electromagnetic negative stiffness are suitable for equipment micro-vibration main and passive vibration isolation in thefield of spaceflight aviation, precise instruments and the like.

Description

technical field [0001] The invention relates to the technical field of micro-vibration active and passive vibration isolation, in particular to a space six-degree-of-freedom active and passive vibration isolation platform and method based on electromagnetic negative stiffness. Background technique [0002] With the development of aerospace technology, the requirements for the vibration suppression level of spacecraft pointing mechanisms, image stabilization equipment, and precision instruments are getting higher and higher. As a space multi-degree-of-freedom micro-vibration isolation system, the Stewart platform is widely used in aerospace precision The micro-vibration environment of the instrument. In the vibration isolation system, due to the passive vibration isolation must be at the resonance frequency of the system Only by reducing the resonance frequency of the system can the vibration isolation frequency range be expanded and the vibration isolation effect improved....

AI Technical Summary

Problems solved by technology

However, this kind of negative stiffness vibration isolation structure is mostly passive vibration isolation. After the structural design is completed, it cannot be flexibly adjusted according to the actual vibration changes.

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