Bistable nonlinear vibration isolator and track vibration isolation system

Abstract

The bistable nonlinear vibration isolator comprises the elastic piece arranged between the base body and the vibration source, the elastic piece guarantees the bearing capacity of the vibration isolator while achieving vibration isolation between the base body and the vibration source, and the vibration isolator further comprises a cantilever structure and a second magnetic piece; the suspension end of the cantilever structure is provided with the first magnetic part opposite to the second magnetic part, and the opposite sides of the two magnetic parts are the same in polarity, so that a bistable structure is formed, and the bistable structure has excellent energy harvesting performance, especially the large-amplitude motion form of jumping between steady states, does not depend on specific excitation frequency, and is high in energy harvesting efficiency. And energy can be collected on a relatively wide frequency band. Nonlinear magnetic force is introduced on the basis that the bearing capacity of the elastic piece is improved, the dynamic characteristic of the vibration isolator is changed, a magnetic bistable structure is constructed, and low-frequency broadband high-load vibration isolation is achieved through the nonlinear characteristic of the bistable structure. The bistable nonlinear vibration isolator is applied to a track vibration isolation system, and a good vibration isolation effect can be achieved.

Description

technical field [0001] The invention relates to the technical field of vibration isolation, in particular to a bistable nonlinear vibration isolator and a track vibration isolation system. Background technique [0002] At present, my country has entered a period of rapid development of urban rail transit construction in an all-round way, and 45 cities are planning to build urban rail transit. According to incomplete statistics, more than 250 subway lines have been built and operated in cities in my country, with a total mileage exceeding 7,000 kilometers. As a modern metropolis, Beijing has a rail transit network with a total mileage of more than 800 kilometers. Subway traffic has effectively relieved the heavy pressure of population flow in major cities, and played a pivotal role in solving traffic congestion problems in major cities in my country. [0003] At present, in view of the vibration pollution caused by rail transit operation, the vibration control and optimizat...

AI Technical Summary

Problems solved by technology

Traditional vibration isolation technologies such as elastic sleepers, elastic fasteners, and steel spring floating plates or rubber floating plates have good vibration isolation effects on medium and high frequency vibrations, but have no significant effect on vibration isolation below 10Hz

In addition, the traditional linear vibration isolator will have problems of excessive static deformation and instability when isolating low-frequency vibrations, and faces a major challenge of not being able to balance low-frequency broadband vibration isolation and high bearing capacity

Therefore, low-frequency vibration isolation is the technical bottleneck of vibration and noise reduction in rail transit systems

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