Six-degree-of-freedom quasi-zero-rigidity vibration isolation system based on Stewart platform

Abstract

The invention provides a six-degree-of-freedom quasi-zero-rigidity vibration isolation system based on a Stewart platform. The system comprises an upper platform, a lower platform and six same landing legs fixed between the upper platform and the lower platform through hinge blocks. The three hinge blocks are distributed in an equilateral triangle mode, two corresponding landing legs are fixed to each hinge block, the adjacent landing legs are perpendicular, and the upper platform has six degrees of freedom relative to the lower platform. The six landing legs have the quasi-zero-rigidity characteristic, so that the vibration isolation system has the quasi-zero-rigidity characteristic on the six degrees of freedom, the all-order resonant frequency of the vibration isolation system is small, and the wide vibration isolation frequency range is achieved. The system has the advantages of being high in bearing capacity and low in resonant frequency, has the good restraint effect on low-frequency vibration, and is suitable for vibration isolation of flywheel systems and optical cameras in the spaceflight field and vibration isolation of equipment such as precision machine tools and precision measuring systems in the civil field.

Description

technical field [0001] The invention belongs to the technical field of passive vibration isolation, in particular to a six-degree-of-freedom quasi-zero-stiffness vibration isolation system based on a Stewart platform. Background technique [0002] With the advancement of aerospace technology, aerospace equipment is gradually developing in the direction of precision. Low-frequency vibration and micro-vibration in spacecraft will not only cause damage to precision instruments and equipment, but also affect the use of instruments and equipment (such as optical cameras). For precision equipment such as precision machine tools and precision measurement systems, low-frequency vibrations from the surrounding environment such as seismic waves will seriously affect the accuracy of the equipment. Micro-vibration and low-frequency vibration have become the focus and difficulty in the field of vibration control. Vibration isolation is an important means of vibration control. Researche...

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