Electromagnetic negative stiffness device

Abstract

The invention belongs to the technical field of vibration control equipment, and particularly relates to an electromagnetic negative stiffness device. Comprising a bottom supporting seat, a cam driving structure, a top connecting seat and an electromagnetic driving structure, the bottom supporting seat comprises a supporting plate; the top connecting seat comprises a suspension arm; the cam driving structure comprises a limiting cam and a contact rod; the electromagnetic driving structure comprises an electromagnet and an armature. According to the electromagnetic negative stiffness device, the magnitude of the input current and the air gap parameter can be adjusted according to the change of the bearing weight, so that the stiffness of the system at the balance position is zero, the inherent frequency of the system is reduced when a vibration-isolated object performs small-amplitude vibration near the balance position, large-range low-starting-frequency vibration isolation is achieved, and the vibration isolation efficiency is improved. And the device has good low-frequency vibration isolation capability, and is compact in overall structure and easy to control.

Description

technical field [0001] The application belongs to the technical field of vibration control equipment, and in particular relates to an electromagnetic negative stiffness device. Background technique [0002] Quasi-zero-stiffness vibration isolators are widely used in precision instrument vibration isolation, building and bridge earthquake resistance, space microgravity simulation, high-speed vehicle vibration reduction, aerospace vehicle vibration control, Marine machinery noise reduction and other engineering fields. Scholars at home and abroad have carried out fruitful work on theoretical research, dynamic characteristic analysis and negative stiffness device design. However, the high static and low dynamic stiffness vibration isolators currently studied by many scholars mainly design their structural parameters for specific working conditions. In actual engineering, due to the change of the bearing load or the aging of the elastic components, the vibration isolation perfo...

AI Technical Summary

Problems solved by technology

At present, the typical implementation methods of negative stiffness devices at home and abroad include: linear spring type, Euler bar type, rubber type, air spring type, disc spring type, magnet type, etc., but they all face an important problem: How to achieve controllable and adjustable negative stiffness has not solved this problem. The aforementioned system is difficult to adapt to quasi-zero stiffness vibration isolators under different working conditions. When the load changes, the low-frequency vibration isolation performance of the system cannot be guaranteed.

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