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Method for predicating noise simulation of rail transit bridge structure

A bridge structure and rail transit technology, applied in special data processing applications, instruments, electrical and digital data processing, etc., can solve the problems of complex coupled vibration analysis, difficult to solve the sound radiation of super large components, etc., to shorten the development cycle, widen The effect of analyzing frequency bands and improving computational efficiency

Inactive Publication Date: 2013-01-16
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

Although most bridge sections have become "noise hotspots" on the noise map, due to a series of problems such as various types of bridge structures, complex analysis of vehicle (line) bridge coupling vibration, and difficulty in solving the acoustic radiation of super-large components, the bridge structure Noisy Prediction Gets Insanely Tricky

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  • Method for predicating noise simulation of rail transit bridge structure
  • Method for predicating noise simulation of rail transit bridge structure
  • Method for predicating noise simulation of rail transit bridge structure

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] The rail transit bridge structural noise simulation prediction method of the present invention is based on the following basic assumptions:

[0027] (1) The reaction force of the air on the bridge structure is not considered.

[0028] Strictly speaking, the vibration of the structure causes the motion of the air molecules, and the air molecules also react against the structure. However, compared with the bridge structure, the medium of air has a very small density and is a light fluid, so the interaction between the two can be ignored, that is, the fluid-solid coupling effect can be ignored.

[0029] (2) The uniqueness of the sound source.

[0030] The noise generated when the train passes the bridge, in addition to the noise generated by the vibration of the bridge structure, there are many other noise sources (such as wheel-rail noise, aerody...

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Abstract

The invention provides a method for predicating noise simulation of a rail transit bridge structure. The method can be used for widening the noise analysis frequency band of a bridge structure and improving the predication precision and the calculation efficiency, and is applicable to structural noise analysis for bridges of different types. The method comprises the following steps: firstly collecting prediction parameters for noise simulation of the rail transit bridge structure and inputting the prediction parameters into a low frequency band train-rail-bridge coupled vibration model and an intermediate-high frequency band train-rail-bridge coupled vibration model so as to respectively calculate the vibratory response of the bridge structure and the vibratory response of a steel rail; and establishing a bridge sound radiation boundary element model with low-frequency band and a bridge sound radiation statistic energy analysis model with an intermediate-high frequency band, calculating the noise radiation of the bridge structure in the low-frequency band and the intermediate-high frequency band, and then utilizing the noise composition principle to predicate the total noises radiated by the bridge structure.

Description

technical field [0001] The present invention relates to a simulation prediction method of rail traffic bridge structure noise based on bridge acoustic radiation boundary element model and bridge acoustic radiation statistical energy analysis model, which is suitable for large railways (ordinary railways, high-speed railways, passenger dedicated lines, intercity railways, etc.) and The evaluation and prediction of bridge structure noise in urban rail transit (subway, light rail, tram, etc.) belongs to the field of rail transit vibration and noise. Background technique [0002] Compared with other means of transportation, rail transit can solve the problem of high-density passenger flow travel. It is a large-capacity means of transportation and has played a role that cannot be ignored in economic development. However, the noise pollution problem of rail transit has reduced its advantages to some extent. With the improvement of the quality of life, people's tolerance for noise ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 张迅李小珍李亚东刘全民张志俊吴金峰尹航
Owner SOUTHWEST JIAOTONG UNIV
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