Quasi-zero-stiffness floating slab ballast bed system based on positive and negative stiffness parallel connection

Abstract

The invention discloses a quasi-zero-stiffness floating slab ballast bed system based on positive and negative stiffness parallel connection, and belongs to the field of track vibration attenuation and noise reduction. The quasi-zero-stiffness floating slab ballast bed system is characterized in that quasi-zero-stiffness vibration isolators are evenly arranged in a track system and are poured in reserved installation holes in a floating slab ballast bed, and an outer sleeve is embedded in each hole; each outer sleeve mainly comprises a four-spring roller ball stiffness vibration isolator and adamping cavity; the upper end of each outer sleeve is provided with an insulation cover plate; and in addition, the outer part of each outer sleeve is provided with a regulation supporting element for displacement supplementation. The floating slab ballast bed has the advantages that the embedded vibration isolator adopts a positive and negative stiffness parallel connection principle to design the four-spring roller ball stiffness vibration isolator, vibration isolation starting frequency can be effectively lowered on a premise that the structural strength and the stability of the floating slab ballast bed system are guaranteed, vibration isolation bandwidth is widened, low-frequency ingredients in track vibration can be effectively isolated, the quasi-zero-stiffness floating slab ballast bed system is an improvement of an existing linear stiffness steel spring floating ballast bed, and the development of a track vibration control new technology and new product is accelerated.

Description

technical field [0001] The invention belongs to the field of rail vibration reduction and noise reduction, and specifically relates to a quasi-zero stiffness floating slab track bed system based on positive and negative stiffness parallel connections, which can be applied to urban rail transit (subway, elevated, light rail) to realize low-frequency vibration control of the rail system . Background technique [0002] At present, the urban rail transit system in China has been developed for more than ten years. For example, Beijing, Shanghai, Guangzhou and Shenzhen have built preliminary urban rail transit networks. However, while urban rail transit brings convenience to our lives, it also brings Environmental problems are also becoming more and more serious. During the construction process, the track will inevitably pass through dense urban centers, beautiful places of interest, key scientific research institutions or quiet residential areas. The environmental vibration probl...

AI Technical Summary

Problems solved by technology

[0012] Aiming at the fact that the existing steel spring floating slab track bed cannot effectively isolate low-frequency vibration components, the present invention proposes a quasi-zero stiffness floating slab track bed system based on the parallel connection of positive and negative stiffness, and reserves installation holes in the floating slab track bed. Pouring the vibration isolator in the reserved installation hole will not affect the structural strength and stability of the entire floating slab ballast bed, and because the ballast bed is embedded with a quasi-zero stiffness vibration isolator, it can meet higher load-bearing requirements. The low-frequency band widens its vibration isolation bandwidth, making it have soft spring characteristics, which can effectively isolate low-frequency components in vibration and realize low-frequency vibration isolation of floating slab tracks

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