Single-degree-of-freedom torsional ultra-low frequency vibration isolation mechanism

Abstract

The invention provides a single degree of freedom torsion ultra-low frequency vibration isolation mechanism. The single degree of freedom torsion ultra-low frequency vibration isolation mechanism comprises two basis platforms fixedly connected by a disturbance input shaft, a vibration isolation output platform and suspension mechanisms. Each of the basis platforms comprises two support frames which extend obliquely upwards and are perpendicular to each other, and under a gravity balance state, the basis platforms are symmetrical relative to a vertical plane passing through the axis of the disturbance input shaft. The vibration isolation output platform is arranged above the disturbance input shaft. The suspension mechanisms are arranged between the support frames and the vibration isolation output platform, the two suspension mechanisms located on the same basis platform side are connected through spring-damping branching chains to form multi-ring coupling mechanisms, and the mechanisms have a degree of freedom of rotation of 1 degree. Through the reasonable mechanism size design, the vibration isolation mechanism has the characteristic of quasi-zero stiffness. The single degree offreedom torsion ultra-low frequency vibration isolation mechanism has the advantages of simple structure, light self weight and high carrying capacity, can realize the ultra-low frequency vibration isolation movement of the plane single degree of freedom torsional direction, and meets the ultra-low frequency vibration isolation requirements of ship / vessel equipment.

Description

technical field [0001] The invention relates to low frequency and ultra-low frequency vibration isolation technology, in particular to a multi-ring coupled ultra-low frequency torsional vibration isolation mechanism. Background technique [0002] Nonlinear passive vibration isolators have been widely used in low-frequency and ultra-low-frequency vibration isolation. Because of their strong nonlinear stiffness, their performance is significantly better than traditional linear vibration isolation. The quasi-zero stiffness vibration isolator is also a strong nonlinear vibration isolator, which satisfies the characteristics of high static and low dynamic stiffness, and the stiffness is very close to or equal to zero at the center equilibrium position. Carrella of the University of Southampton in the United Kingdom first proposed the basic concept of quasi-zero stiffness vibration isolation, and analyzed its basic dynamic characteristics, proving the feasibility of its low-freque...

AI Technical Summary

Problems solved by technology

With the widespread use of high-end precision equipment, the requirements for the application conditions of ship / shipborne equipment are becoming more and more stringent. However, the research on vibration isolation of torsional and swaying low-frequency motions has been relatively slow in recent years, and most of them are carried out through active methods. Isolation, such as a spacecraft stabilizing its low-frequency disturbance through a dynamic gyroscope; similarly, the vibration attenuation of ship equipment is mainly in the form of an electric stabilization platform, and pure passive isolation is rarely used

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