A multi-degree-of-freedom low-frequency vibration isolator based on the coupling of vibration mode and pendulum mode

Abstract

The invention relates to a multi-degree-of-freedom low frequency vibration isolator based on vibration mode and swing mode coupling. The multi-degree-of-freedom low frequency vibration isolator mainlycomprises a high static state stiffness vibration isolator body and a low dynamic state stiffness vibration isolator body which are the same and are symmetrically arranged up and down, and supportingrods of the high static state stiffness vibration isolator body and the low dynamic state stiffness vibration isolator body are connected with a space swing mechanism through two spherical hinges; the high static state stiffness vibration isolator body and the low dynamic state stiffness vibration isolator body are each provided with a spiral spring and a magnetic negative stiffness mechanism; each spiral spring provides positive stiffness supporting along an axial support; each magnetic negative stiffness spring is formed by three attracted annular permanent magnets and provides nonlinear resilience and negative stiffness characteristics in the vertical direction; and the high static state stiffness vibration isolator body and the low dynamic state stiffness vibration isolator body achieve motion coupling with the space swing mechanism, quasi-zero stiffness characteristics and geometric nonlinearity damping in the horizontal direction are achieved, and low-frequency vibration of an object subject to vibration isolation in three transverse movement directions is effectively isolated. The multi-degree-of-freedom low frequency vibration isolator has the beneficial effects of high bearing capacity and low resonant frequency, and the good inhibitory effect on the low frequency vibration in multiple degree-of-freedom directions is achieved.

Description

technical field [0001] The invention relates to the technical field of vibration isolation, in particular to a multi-degree-of-freedom low-frequency vibration isolator based on vibration mode and pendulum mode coupling. Background technique [0002] In engineering fields such as aerospace and precision instruments, vibration problems will directly affect the safety and reliability of institutional equipment. For example, external disturbances such as random / shock that are common in engineering will cause damage to mechanical parts, reduce the measurement accuracy of instruments and instruments, and shorten the service life. In addition, the main energy of this type of external disturbance is often distributed in the low frequency band in multiple degrees of freedom directions, so the problem of suppressing this type of vibration needs to be solved urgently in practical engineering. [0003] For the multi-degree-of-freedom low-frequency vibration suppression problem, vibrati...

AI Technical Summary

Problems solved by technology

Previously, the quasi-zero stiffness / high static-low dynamic stiffness nonlinear vibration isolators studied by scholars were mainly concentrated in the form of a single degree of freedom, which could not meet the needs of multi-degree-of-freedom low-frequency vibration suppression, and had great limitations in practical applications. sex

At the same time, there are few reports on the application of the low-frequency vibration isolation principle of quasi-zero stiffness / high static-low dynamic stiffness to multi-degree-of-freedom vibration isolation.

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