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Rigidity-variable rotating arm rubber node piece based on hard magnetic magnetorheological elastomer

A magneto-rheological elastomer and rubber joint technology, which is applied to railway car body components, bogies, sustainable transportation, etc., can solve the problems that passive rubber joints cannot have both, and achieve obvious residual magnetism, reversible changes, and coercive powerful effect

Pending Publication Date: 2022-08-05
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the passive rubber joints cannot meet the two kinds of stiffness requirements, it can maintain a large stiffness when the train is running on a straight track to ensure the high-speed stability of the train, and reduce the stiffness when the train needs to turn to improve the wear of the wheel and rail to reduce operation and maintenance. cost, the present invention provides a variable stiffness arm rubber node based on hard magnetic magnetorheological elastomer

Method used

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  • Rigidity-variable rotating arm rubber node piece based on hard magnetic magnetorheological elastomer
  • Rigidity-variable rotating arm rubber node piece based on hard magnetic magnetorheological elastomer

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0026] see figure 1 , a hard magneto-rheological elastomer-based variable rigidity arm rubber node includes a node mandrel 1 , a pair of electromagnetic coils 2 , a steel ring 3 , a magnetorheological elastomer 4 and a casing 5 .

[0027] A pair of coil slots are radially opened in the middle of the node mandrel 1 , the slot width of the coil slot is greater than the width of the electromagnetic coil 2 , and the slot depth is one third of the radius of the node mandrel 1 . A pair of electromagnetic coils 2 are fixedly installed in a pair of coil slots. The enameled wire of each electromagnetic coil 2 is a copper enameled wire with a diameter of 0.51 mm, and the number of turns is 1250.

[0028] The steel ring 3 includes three groups of rings, and each group of rings further includes six coaxial rings with the same width and gradually increasing diameter. The magnetorheological elastomers 4 are evenly arranged between adjacent rings; the magnetorheological elastomers 4 are ha...

Embodiment 2

[0037] see figure 2, the rigidity controllable magnetorheological rubber node piece of the present invention is the key component of the longitudinal positioning of the bogie series. In use, the outer casing 5 is fixedly connected to the wheel 6 through the rotating arm 8 , and the two ends of the node mandrel 1 are fixedly connected to the fork structure of the frame 9 . The controllable magnetorheological rubber node can withstand the longitudinal force, lateral force and part of the vertical force generated by the wheel-rail contact during the running of the train. When the train is running in a straight line, there is no need to energize it, and the internal remanence of the hard magnetorheological elastomer 4 is used to make the controllable magnetorheological rubber node exhibit a large radial stiffness of 7.5 MN / m; when the train passes the curve, a current is applied , to cancel the internal magnetic field of the magnetorheological elastomer 4, and the minimum radial...

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Abstract

The invention relates to a rigidity-variable tumbler rubber node based on a hard magnetic magnetorheological elastomer, and belongs to the technical field of rubber nodes for trains. Comprising a node mandrel, a pair of electromagnetic coils, a steel ring, a magnetorheological elastomer and a shell, the middle part of the node core shaft is radially arranged in the pair of coil grooves; the steel ring comprises more than two groups of circular rings, the magnetorheological elastomers are poured between the adjacent circular rings, and the steel ring is sleeved on the node mandrel in an interference manner and avoids the pair of electromagnetic coils; the steel ring is sleeved with the shell in an interference mode. When the variable-rigidity rotating arm is not electrified, an initial magnetic field is provided by internal residual magnetism of the magnetorheological elastomer, a closed magnetic circuit is formed in the variable-rigidity rotating arm rubber node, and the radial rigidity is 7.5 MN / m; current is applied to the electromagnetic coil, so that an electromagnetic field with the direction opposite to that of residual magnetism in the magnetorheological elastomer is generated in the variable-rigidity rotating arm rubber node, and the radial rigidity is 5 MN / m. Through the excitation mode of the composite magnetic field, the rigidity requirements of the train on different road sections are met, and the dynamic performance is improved.

Description

technical field [0001] The invention belongs to the technical field of rubber joint pieces for trains, and in particular relates to a rubber joint piece for a variable stiffness rotating arm based on a hard magneto-rheological elastomer. Background technique [0002] With the increase of train speed, higher requirements are also put forward for high-speed train bogies. When the train passes through the track section with different road conditions of straight line and curve, it has completely opposite stiffness requirements for a series of longitudinal positioning stiffness of the bogie. When running in a straight section, high-speed EMU trains often need to run at a speed of 300 km / h and above. At this time, the train is prone to violent serpentine motion. At this time, the bogie positioning requires greater rigidity to resist the serpentine motion. , so as to ensure the stability of the train; and when passing through a curved section, a small stiffness is required, so tha...

Claims

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Application Information

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IPC IPC(8): B61F5/30B61F5/50
CPCB61F5/30B61F5/50Y02T30/00
Inventor 孙帅帅巩宁龚兴龙张世武杨健
Owner UNIV OF SCI & TECH OF CHINA