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
CN104036087AInactive Publication Date: 2014-09-10TONGJI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TONGJI UNIV
Publication Date
2014-09-10
Estimated Expiration
Not applicable · inactive patent

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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.
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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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