A low-frequency vibration isolation system and vibration isolation method based on electrostatic negative stiffness

Abstract

The invention discloses an electrostatic negative stiffness based low-frequency vibration isolation system and method. The system comprises an outer frame, a leveling device, a mechanical spring, a vibration isolation flat plate, a first capacitance plate and a second capacitance plate, wherein the leveling device is positioned at the bottom part of the outer frame; the mechanical spring is positioned into the outer frame; the vibration isolation flat plate is positioned at a certain distance on the upper end of the outer frame; the first capacitance plate and the second capacitance plate are fixedly arranged on the sidewall of the outer frame; a medium capacitance plate is fixedly arranged at the mechanical spring along the radial direction and positioned between the first capacitance plate and the second capacitance plate; the first capacitance plate and the medium capacitance plate form a first capacitor C1; the second capacitance plate and the medium capacitance plate form a second capacitor C2, and therefore, a differential capacitor pair is formed. According to the system and method, a power supply respectively supplies proper voltage to the first capacitance plate, the second capacitance plate and the medium capacitance plate, and differential capacitors provide equivalent electrostatic negative stiffness to counteract the mechanical stiffness of the mechanical spring, thus the total stiffness of the whole spring system is reduced, and as a result, the low-frequency vibration isolation effect is realized.

Description

technical field [0001] The invention belongs to the technical field of gravimeters, and more specifically relates to a spring vibration isolation system and vibration isolation method based on electrostatic negative stiffness. Background technique [0002] The vibration isolation system is one of the core components of the absolute gravimeter. The performance of the vibration isolation system directly affects the accuracy of the absolute gravimeter, and the vibration isolation system is also widely used in aerospace, optics, machining, medical and manufacturing industries. . [0003] Spring vibration isolation system is one of the most common vibration isolation systems. At present, long-period spring vibration isolation systems mainly include active vibration isolation system and mechanical negative stiffness spring vibration isolation system. The typical representative of active vibration isolation system is the ultra- Long spring system, which uses laser to detect the re...

AI Technical Summary

Problems solved by technology

However, the longer the resonance period of the spring, the longer the geometric dimension of the spring is required. In practice, the geometric dimension of the spring is limited, so the resonance period of the spring vibration isolation system is usually not too long, which cannot reach several seconds or even tens of seconds. Achieve lower frequency vibration isolation

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