Quasi-zero stiffness vibration isolator connected with magnetic spring in parallel through spiral spring

Abstract

A quasi-zero stiffness vibration isolator connected with a magnetic spring in parallel through a spiral spring comprises a mass supporting rod, and one end of the mass supporting rod is fixedly connected with the spiral spring through threads; a permanent magnet clamped by the spiral spring, the spiral spring and the mass supporting rod move together relative to a spiral spring clamping mechanism in the axial direction, and meanwhile the spiral spring provides positive stiffness for a system in the axial direction; two annular permanent magnets fixed through the permanent magnet clamping mechanism apply attraction to the permanent magnet clamped by the spiral spring, the three permanent magnets form the magnetic spring, and non-linear restoration force and non-linear negative stiffness are provided for the system; the relative distances between the upper permanent magnet and the permanent magnet clamped by the spiral spring and between the lower permanent magnet and the permanent magnet clamped by the spiral spring can be adjusted by rotating the permanent magnet clamping mechanism. By means of the vibration isolator, intrinsic frequency of the vibration isolation system can be effectively reduced, and the vibration isolation frequency band is widened. Meanwhile, the damping characteristic of the structure is improved, and a reliable method is provided for low-frequency vibration control.

Description

technical field [0001] The invention relates to the technical field of vibration isolation, in particular to a quasi-zero-stiffness vibration isolator using a helical spring and a magnetic spring connected in parallel. Background technique [0002] The phenomenon of mechanical structure vibration generally exists in the actual production practice. When the system is excited by an external vibration source, it will vibrate. People use vibration to serve production practice, such as vibration screening, vibration pile sinking, vibration transmission and sensors designed according to vibration theory, etc. commonly used in industry; however, in the technical fields of national defense technology, industrial machinery, instruments, instruments, etc. Vibration often leads to structural failure, reduced measurement accuracy, and shortened service life. For example, the vibration of instruments and instruments will reduce their measurement accuracy; when the spacecraft is launche...

AI Technical Summary

Problems solved by technology

Since the performance and preparation of permanent magnets have made some progress, it is relatively easy to design a vibration isolation system with quasi-zero stiffness characteristics using a permanent magnet structure; And the nonlinear vibration isolation system with small space size is more difficult

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