Non-linear combined spring vibration isolator

Abstract

The invention belongs to the technical field of vibration and noise reduction of rail transit, in particular to a steel spring vibration isolator which can provide nonlinear elastic bearing capacity.The invention solves the problems of poor vibration control effect and low leveling construction efficiency of the floating ballast bed system under the condition of varying dynamic load. At least oneof that static load support spr and the combined support spring respectively comprises a helical steel spring, A static load bearing spring and a combined bearing spring are arranged in parallel or the combined bearing spring is sleeved outside the static load bearing spring, and the static bearing spring supports the upper shell, at least a part of the combined bearing spring is provided with asolid damping structure, or the lower shell is provided with a damping material, and the combined bearing spring is at least partially arranged in the damping material; The invention has the advantages of simple structure, strong adaptability to dynamic load change and good vibration isolation performance, and can be widely applied to complex vibration isolation engineering where dynamic load is easy to change.

Description

technical field [0001] The invention belongs to the technical field of vibration reduction and noise reduction for rail transit, and specifically relates to a steel spring vibration isolation device that can provide nonlinear elastic bearing capacity. Background technique [0002] Vibration isolation and damping have always been the core issues of urban rail transit and construction. Floating ballast bed technology is widely used to solve vibration isolation and damping problems. Among them, the floating ballast bed system based on the steel spring vibration isolation device has been recognized in the industry due to its good vibration isolation effect, long service life, and stable vibration isolation effect, and has been widely used in rail transit lines in many countries and cities middle. However, the existing steel spring vibration isolation devices are all designed to provide linear elastic bearing capacity. For safety considerations, their vertical stiffness is rela...

AI Technical Summary

Problems solved by technology

However, the existing steel spring vibration isolation devices are all designed to provide linear elastic bearing capacity. For safety considerations, their vertical stiffness is relatively large, and the amount of compression during work is small. According to "CJJ-T191-2012 Floating Plate Track "Technical Specifications" requires that "the maximum vertical displacement of the floating plate under the rated load of the train should not exceed 3mm", therefore, the compression of the steel spring vibration isolation device under working conditions generally does not exceed 3mm

The problems caused by this include: (1) The spring stiffness is large, the compression amount is small during operation, and the natural frequency of the system is high, so it is difficult to fully adapt to the vibration control requirements under the changing dynamic load conditions when the rail vehicle passes by. Only a certain value of the spring can be compressed to achieve a good vibration and noise reduction function, resulting in a good vibration isolation effect for the local section that is carrying the rail vehicle, and the vibration isolation effect for the insufficiently loaded section is limited, and the overall vibration isolation effect is limited; ( 2) Under non-working conditions, when only the floating slab is supported, due to the small load, the static compression of the steel spring vibration isolation device is too small, sometimes even less than 1mm, which makes it difficult to adjust the height and level of the floating ballast bed, and the construction efficiency is low

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