Bridge vibration and noise reduction rapid prediction and evaluation method

Abstract

The invention discloses a bridge vibration and noise reduction rapid prediction and evaluation method which specifically comprises the following steps: firstly, establishing a three-dimensional bridge finite element model, and obtaining a dynamic flexibility matrix of a bridge through simple harmonic excitation vibration analysis; secondly, establishing a multi-rigid-body vehicle model, and solving through a vehicle dynamic equation to obtain a dynamic flexibility matrix of wheels; solving through a vibration coupling equation of a frequency domain to obtain a wheel-bridge floor interaction force, and applying the interaction force to a bridge structure for resonance response analysis; calculating the vibration power of each part of the bridge, enabling the vibration power to be equivalent to a theoretical sound source model, and predicting the vibration radiation noise of the bridge; and finally, comparing the vibration power and the sound field distribution before and after the vibration and noise reduction measures are adopted, and evaluating the vibration and noise reduction effect.

Description

technical field [0001] The invention relates to the field of bridge engineering, in particular to a rapid prediction and evaluation method for bridge vibration reduction and noise reduction. Background technique [0002] With the development of cities and the continuous increase of traffic flow, the number and total length of bridges are increasing day by day. When the vehicle passes the bridge, it will cause the structural vibration of the bridge, which will then be transmitted to the nearby buildings through the soil and generate radiated noise. The vibration and noise problems caused by bridge structures are becoming more and more significant, and have a greater impact on nearby building structures and residents' lives, especially in areas with high population density such as urban areas, where the impact of vibration and noise is more obvious. At the same time, due to the vibration noise of the bridge structure itself, the overall noise level is often greater than the r...

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Problems solved by technology

[0003] Since the vibration and noise of bridge structures is a multidisciplinary problem involving vehicle dynamics, bridge dynamics, acoustics and other fields, it is necessary to conduct joint simulation analysis through multiple professional software. Solving the radiation model is time-consuming and requires personnel specialized in related research to perform calculation and analysis. The technical threshold is high and it is not easy to popularize and apply

In the bridge design stage or the preliminary design of the vibration and noise reduction scheme, the use of complex vibration and noise prediction methods is not convenient for parameter analysis, the calculation efficiency is low, and it is not convenient for engineering designers to carry out comparative analysis

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