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Two-dimensional periodic cushion vibration reduction ballast bed vibration isolation frequency band regulation and control design method

A two-dimensional periodic and design method technology, applied in computer-aided design, calculation, special data processing applications, etc., can solve the problems of periodic vibration damping ballast bed without engineering experience, no scientific system theoretical calculation, etc., to achieve wide applicability, use The effect of convenient, simple basic theory

Pending Publication Date: 2021-04-09
CHINA RAILWAY DESIGN GRP CO LTD
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Problems solved by technology

At present, there are no engineering implementation cases of periodic vibration-reducing ballast based on the theory of periodic structural bandgap, so that there is no engineering experience to learn from, and no scientific and systematic theoretical calculations to support

Method used

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  • Two-dimensional periodic cushion vibration reduction ballast bed vibration isolation frequency band regulation and control design method
  • Two-dimensional periodic cushion vibration reduction ballast bed vibration isolation frequency band regulation and control design method
  • Two-dimensional periodic cushion vibration reduction ballast bed vibration isolation frequency band regulation and control design method

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specific Embodiment

[0097] In one embodiment of the invention, figure 2 The periodic track bed constructed by the method, the energy band structure calculation adopts the rectangular lattice in the two-dimensional lattice, such as Figure 5 shown. The specific geometry and material calculation parameters are as follows:

[0098] The width of the concrete slab (1-1) and the periodic cushion (1-2) is 2.2m, the thickness of the concrete slab (1-1) is 0.1m, the periodic cushion (1-2) is made of rubber material, the thickness is 0.01m, and the width 0.4m, continuously arranged along the line direction, the arrangement position is directly below the rail bearing platform, the concrete slab (1-1) and the periodic cushion (1-2) are repeated alternately from top to bottom, each repeated 3 times, and the thickness is 0.33 m periodic composite track bed-slab structure (1). The material parameters of the concrete slab (1-1) are: modulus of elasticity 30000MPa, Poisson's ratio 0.2, density 2500kg / m 3 ; P...

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Abstract

The invention discloses a two-dimensional periodic cushion vibration reduction ballast bed vibration isolation frequency band regulation and control design method. The method is characterized in that under the basic assumption that a two-dimensional periodic cushion vibration reduction ballastbed is infinitely and repeatedly arranged along two periodic directions and infinitely extends along a line walking direction, with a plane strain condition being met, and starting from a wave equation of a two-dimensional periodic structure, a material coefficient and an amplitude modulation function of a Bloch wave are expanded into Fourier series, the elastic wave equation is expanded as a plane wave in reciprocal space to obtain an eigenvalue equation, and a reciprocal lattice vector is made to sweep a plane lattice irreducible Brillouin area to solve the energy band structure of the two-dimensional periodic cushion vibration reduction ballast bed. A vibration isolation frequency band is determined according to the forbidden band distribution range, the change rule of the forbidden band and the vibration isolation frequency band along with geometry and material parameters is obtained through influence factor analysis, and active regulation and control of the forbidden band and the vibration isolation frequency band are achieved. The method is simple in basic theory, wide in applicability and convenient to use, and the calculation result can completely meet the engineering design requirements.

Description

technical field [0001] The invention relates to the field of rail transit vibration reduction and noise reduction, in particular to a two-dimensional period cushion layer vibration reduction ballast bed vibration isolation frequency band regulation and design method. Background technique [0002] At present, the rail vibration reduction measures widely adopt the method of reducing the support stiffness or increasing the vibration mass to control the environmental vibration. Such methods may cause abnormal wear of the wheel and rail in the case of excessive vibration reduction or improper vibration reduction, resulting in rapid breakdown of equipment and parts. Abnormal damage will increase the maintenance and repair workload of the wheel-rail system, and even affect the stability and safety of driving. In addition, the existing track vibration reduction design lacks scientific frequency planning and comprehensive vibration reduction and isolation concepts, resulting in the e...

Claims

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Application Information

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IPC IPC(8): G06F30/13G06F119/10
CPCG06F30/13G06F2119/10
Inventor 姜博龙刘冀钊胡文林王少林何宾齐春雨杨宝峰杨其振刘道通谭大正程保青徐彩彩韩朝霞
Owner CHINA RAILWAY DESIGN GRP CO LTD
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