Design method of fixed-frequency nonlinear rubber vibration isolator for floating slab track

Abstract

The invention provides a fixed-frequency nonlinear rubber vibration isolator for a floating slab track and a design method. It is guaranteed that in an empty vehicle state, a floating slab track bed has the same vibration isolation performance and the unchanged inherent frequency as those in a heavy vehicle state, the track vertical displacement in the heavy vehicle state is effectively restrained, and the system safety is guaranteed. The fixed-frequency nonlinear rubber vibration isolator comprises a base 1, a conic rubber pile, an upper supporting seat, a heightening cushion board and a locking screw, the top face of the base is attached to the inner conic face of the conic rubber pile, and the bottom face of the upper supporting seat is attached to the outer conic face of the conic rubber pile. The conic rubber pile comprises an inner conic steel disc, an outer conic steel disc and at least one layer of conic rubber body located between the inner conic steel disc and the outer conic steel disc and fixedly connected with the inner conic steel disc and the outer conic steel disc. Each conic rubber body is composed of conic rubber ring units arranged along the conic faces of the inner conic steel disc and the outer conic steel disc at intervals. Each conic rubber ring unit is provided with an exhausting channel communicating with the outer side of the vibration isolator.

Description

technical field [0001] The invention relates to railway tracks, in particular to a design method for a fixed-frequency nonlinear rubber vibration isolator suitable for floating slab tracks such as subways, light rails, intercity railways, and high-speed railways. Background technique [0002] Floating slab track is an effective method to solve the problem of environmental vibration caused by rail traffic. The floating slab track isolates the vibration of the track slab from the foundation by setting elastic vibration isolators under the track slab, so as to reduce the environmental vibration caused by rail traffic. The floating slab track is essentially a mass-spring-damper vibration isolation system. At present, the floating plate mainly adopts steel spring vibration isolators and ordinary rubber vibration isolators. The stiffness characteristics of both types of isolators are linear stiffness or close to linear stiffness. However, in the mass spring vibration isolation ...

AI Technical Summary

Problems solved by technology

However, it has poor adaptability to trains with different loading conditions and cannot provide consistent vibration isolation performance. Due to the limitation of excessive track vertical displacement when heavy vehicles pass through, it is impossible to further improve the vibration isolation performance of floating plates.

The existing spring vibration isolators have the defects of poor vibration isolation performance in the empty state and excessive vertical displacement of the track in the heavy state

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