高速列车在板式轨道上运行时的滚动噪声预测

在已建立的轮轨滚动噪声预测模型的基础上,对"中华之星"高速列车在板式轨道上运行时的轮轨滚动噪声进行了预测分析,结果表明:钢轨辐射的主要是中、高频噪声,车轮辐射的主要是中频噪声,而轨道板则辐射高、中和低频噪声;钢轨噪声最大,车轮次之,轨道板最小。通过对高速列车在板式轨道上运行时产生的轮轨滚动噪声与在有碴轨道上运行时的轮轨滚动噪声比较,发现板式轨道噪声辐射比有碴轨道大4.0dB(A)左右。

Prediction of Wheel/Rail Rolling Noise When a High-speed Train Runs on a Slab Track

On the basis of the wheel/rail rolling noise prediction model, the wheel/rail rolling noise produced by a train running on the slab track is analyzed in this paper. It is shown that the rails radiates chiefly middle and high frequency noises, and that the wheel radiates chiefly midddle frequency noises, and that the slab radiates noises in a wide range of bands of frequency. It makes clear that the contributions of the rail, the wheel and the slab are not identical to the total noise, among the three parts the rail is the largest, and the wheel takes the second place, and the slab is the smallest respectively. Comparison of rolling noises between the slab track and the ballast track is carried out, results indicate that the slab track produces about 4.0 dB(A) more noise than the ballasted track.