Power flow-boundary element model based elevated rail traffic vibratory-noise simulating and predicting method

A rail transit, simulation and prediction technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of heavy noise pollution on elevated lines

Inactive Publication Date: 2014-09-10
TONGJI UNIV
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Problems solved by technology

However, the noise pollution of elevated lines is heavier than that of underground lines, which has become an important factor restricting its development

Method used

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  • Power flow-boundary element model based elevated rail traffic vibratory-noise simulating and predicting method
  • Power flow-boundary element model based elevated rail traffic vibratory-noise simulating and predicting method
  • Power flow-boundary element model based elevated rail traffic vibratory-noise simulating and predicting method

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Embodiment 1

[0041] In this embodiment, the flow chart of the noise simulation and prediction method for elevated rail transit based on the power flow-boundary element model is as follows Figure 1~4 shown. Firstly, the parameters of rail transit noise simulation prediction are selected, and a three-dimensional finite element model of the bridge is established to obtain the bridge modal file, which is input into the track-bridge power flow model, and the unit simple harmonic force of different frequencies acts on the track span, and the track and bridge are calculated. The vibration power under the action of unit simple harmonic force, combined with the combined wheel-rail roughness spectrum and vehicle parameters, calculates the wheel-rail contact force spectrum under the wheel-rail-bridge coupling system, and then obtains the bridge and track vibration under random wheel-rail force State; after that, establish the two-dimensional finite element model of the track and bridge, apply the un...

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Abstract

The invention relates to a power flow-boundary element model based elevated rail traffic vibratory-noise simulating and predicting method. The power flow-boundary element model based elevated rail traffic vibratory-noise simulating and predicting method comprehensively considers bridge noise and steel-rail noise of the medium-frequency range (200-1000Hz) in elevated rail traffic, and is higher in noise prediction accuracy than that of a method only considering bridge noise or steel-rail noise. The method includes firstly establishing a rail- bridge system power flow model, calculating input power of bridges and vibration speed of steel rails when harmonic force units different in frequency act on the steel rails; secondly, calculating wheel-rail contact force spectrum under a wheel-rail-bridge coupling system through a wheel-rail combination roughness spectrum so as to obtain vibration states of the bridges and the steel rails under the action of random wheel-rail force; thirdly, respectively establishing an acoustic-radiation two-dimension finite-element-boundary element weak-coupling model for the bridges and the steel rails, and calculating vibration power and radiation sound field under the action of the harmonic force units at different frequencies; finally, acquiring practical vibration power by the power flow method and vibration power by the finite-element-boundary element model, scaling field-point sound pressure under the action of unit force to obtain the bridge noise, the steel-rail noise and the total noise thereof.

Description

technical field [0001] The invention relates to a comprehensive simulation and prediction method of elevated rail transit bridge and track noise based on a power flow vibration calculation model and a boundary element acoustic radiation calculation model, which can be applied to the design and acoustic environment assessment of urban rail transit elevated bridge structures and track structures. It belongs to the field of rail transit vibration and noise. Background technique [0002] With the continuous advancement of urbanization and rapid economic development, the pressure on urban public transport is increasing. Rail transit, which integrates economy, environmental protection, energy saving, high efficiency and safety, is the best choice for the construction of densely populated cities in my country. Rail transit elevated lines have a short construction period, low cost, and convenient maintenance after operation, making them the preferred form of suburban lines. Howeve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 励吾千李奇吴定俊于贞波
Owner TONGJI UNIV
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