Quasi-zero stiffness vibration isolator with adjustable positive stiffness and adjustable negative stiffness

Abstract

The invention belongs to the field of vibration isolation and noise reduction equipment, and particularly relates to a quasi-zero stiffness vibration isolator with adjustable positive and negative stiffness. Comprising a supporting assembly, an electromagnetic positive stiffness assembly and an electromagnetic negative stiffness assembly. The supporting assembly comprises a connecting plate and a vibration isolation buffering mechanism. The electromagnetic positive stiffness assembly comprises a first electromagnet and a first armature; the electromagnetic negative stiffness assembly comprises a cam conduction mechanism, a guide supporting seat, a second electromagnet and a second armature, the second electromagnet and the second armature are arranged on the guide supporting seat, the quasi-zero stiffness vibration isolator with the adjustable positive stiffness and the adjustable negative stiffness has large static stiffness and small dynamic stiffness, the adjustable and controllable positive stiffness and the adjustable and controllable negative stiffness can be achieved, and the vibration isolation effect is good. The negative stiffness mechanism can be adaptively adjusted to a quasi-zero state by controlling the magnitude of current introduced into the electromagnet and adapting to the change of bearing, so that the negative stiffness mechanism has good low-frequency and ultra-low-frequency vibration isolation effects, the vibration isolation frequency band is wide, the working performance is stable, and the problem of a traditional linear vibration isolation system in low-frequency and even ultra-low-frequency isolation is solved.

Description

technical field [0001] The application belongs to the field of vibration isolation and noise reduction equipment, in particular to a quasi-zero stiffness vibration isolator whose positive and negative stiffness can be adjusted. Background technique [0002] It can be seen from the vibration theory that the low-frequency vibration of submarine mechanical equipment spreads outward through the shell structure to form radiation noise with obvious line spectrum characteristics, which greatly increases the probability of submarine being detected and reduces its stealth. Therefore, how to effectively control the low-frequency vibration generated during the operation of mechanical equipment is the key to improving the stealth of submarines. Installing vibration isolators is a common method to reduce the vibration of submarine mechanical equipment, but ordinary linear vibration isolators are not ideal for low-frequency vibration isolation. In order to expand the vibration isolation ...

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Problems solved by technology

However, the existing quasi-zero-stiffness stiffness vibration isolators are mainly designed for specific working conditions. In actual engineering, due to changes in working conditions, changes in external excitation, and aging of elastic components, the vibration isolation of the system will The performance drops sharply. At this time, the traditional quasi-zero stiffness vibration isolator cannot exert its excellent vibration isolation performance

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