Elastic-Hysteretic Low Frequency Large Displacement Vibration Isolator Based on Electromagnetic Negative Stiffness

Abstract

The invention discloses an elastic-hysteretic low-frequency large-displacement vibration isolator based on electromagnetic negative stiffness. The upper platform and the lower platform are connected by arched beam springs, so that the upper platform can only move axially relative to the lower platform; On the lower platform, the electromagnetic negative stiffness spring composed of inner and outer magnetic rings and electromagnetic coils is connected in parallel with the second and third thin springs to form a real-time adjustable electromagnetic bistable mechanism, and the electromagnetic bistable mechanism is fixedly connected to the upper platform. The first leaf spring on the top is arranged in series; under the excitation of low-frequency large-displacement vibration, the electromagnetic bistable mechanism jumps back and forth between the two balance points and consumes energy to generate elastic-hysteresis phenomenon, achieving high-efficiency vibration isolation; provided by the inner and outer magnetic rings Permanent magnet negative stiffness, adjusting the size of the current in the electromagnetic coil can realize the real-time regulation of the electromagnetic negative stiffness performance, so as to obtain the ideal electromagnetic bistable characteristics, and realize the active and passive integrated vibration isolation. The invention is especially suitable for low frequency large Displacement vibration isolation and buffering conditions.

Description

technical field [0001] The invention relates to the field of vibration isolation technology, in particular to an elastic-hysteresis low-frequency large-displacement vibration isolator designed in series based on a bistable mechanism of electromagnetic negative stiffness and a linear thin spring. Background technique [0002] Mechanical vibration is ubiquitous in production practice. Although vibration phenomena are often used in industry for screening, pile sinking and transportation to provide many conveniences for actual production; but in most working conditions, vibration will bring many adverse effects to human production. Especially with the rapid development of aerospace high-tech, in order to meet the ever-increasing on-orbit operation indicators, various aerospace equipment, such as antennas, solar panels, etc., are developing in the direction of large-scale and flexible For example, a loop antenna with a diameter of 15m produces a low-frequency large-displacement v...

AI Technical Summary

Problems solved by technology

Existing quasi-zero stiffness vibration isolators have a good isolation effect on low-frequency micro-displacement vibration responses, while negative-stiffness mechanisms are accompanied by strong stiffness nonlinear characteristics under the excitation of low-frequency large-displacement vibrations, making it difficult to achieve low-frequency large-displacement vibration Efficient isolation

Therefore, in order to effectively suppress the low-frequency large-displacement vibration response in actual engineering, the internal damping and energy dissipation performance of the vibration isolation system is increased by connecting the negative stiffness mechanism and the positive stiffness element in series to control the low-frequency large-displacement vibration response, but it is still At the stage of theoretical exploration, there is no effective vibration damping device to deal with the low-frequency large-displacement vibration response in actual engineering

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