Precompression combination type nonlinear spring vertical vibration isolation device

Abstract

The invention belongs to the field of vibration and noise control, and provides a precompression combination type nonlinear spring vertical vibration isolation device. The device comprises a first spiral spring, a second spiral spring, prestressed tendons, a viscous damping material, limit levers, limit holes, an upper cover plate, a medium plate and a base. Accordingly, the first spiral spring and the second spiral spring which are vertically connected in series are stressed by stages through prestress to form a rigid nonlinear spring; by designing the rigidity of the first spiral spring andthe second spiral spring, large static rigidity in static load and small dynamic rigidity in dynamic load can be guaranteed simultaneously; by means of the limit levers and the limit holes, it is guaranteed that large deformation does not occur while the device bears great action; when the first spiral spring vibrates, energy is consumed through damping provided by the viscous damping material. The device can be widely applied to special vibration reduction areas high in rail traffic vibration reduction and noise reduction requirement and structures or facilities such as floating floors whichneed vertical vibration isolation, and the vibration reduction effect is superior to that of an existing steel spring vibration isolator.

Description

technical field [0001] The invention relates to a preloaded combined nonlinear spring vertical vibration isolation device based on prestress, which belongs to the field of vibration and noise control. Background technique [0002] With the rapid development of social economy and the continuous expansion of cities, urban traffic congestion is becoming more and more serious, and rail transit has become an important means to solve urban traffic congestion. At present, more than 20 cities in China have or plan to build subway rail lines, with a total investment of more than 600 billion yuan. When rail transit lines pass through populated areas, their long-term operation will inevitably cause vibration and noise pollution. Vibration has been considered as one of the seven major public hazards in the world. Vibration and noise pollution will inevitably affect the surrounding areas on or around rail transit lines The health of residents will be adversely affected, and it will also...

AI Technical Summary

Problems solved by technology

However, when the excitation frequency of the running train is equal to or close to the natural frequency of the floating slab track structure itself, the vibration cannot be effectively weakened, and sometimes the phenomenon of vibration amplification will occur. It will cause hidden dangers to the safety of train operation, so the application has certain limitations

[0004] Therefore, the buildings near the rail transit will be affected by the vibration generated by the rail transit, which will adversely affect the living health and work efficiency of the residents in the building; at the same time, the environmental vibration will seriously affect the accuracy of the instrument.

In addition, steel springs are currently used for vibration isolation of floating floors. Due to the single frequency and fixed spring stiffness, the goal of vibration isolation cannot be achieved well, and the application also has certain limitations.

Images