【摘要】 为了验证列车通过的等效声级、等效时间及预测模式的正确性,选择了一个开阔的场所,在距离铁路外轨中心线30m处采用两种不同的方式记录列车通过时的源强及持续时间,然后利用监测值预测60m处的1h等效连续A声级,并与60m处的1h等效连续A声级监测值进行对比。结果表明,列车经过身边到离开时的持续时间作为等效时间,经过身边时的最大噪声级作为源强,所得到的预测值与监测值的误差范围在-0.3~0.9dB(A),方差为0.229,离散度较小,预测值与监测值较吻合,可用于指导设计与规划工作。同时,在分析误差产生原因的基础上,提出了提高预测准确性的建议。更多还原

【Abstract】 In order to verify the validity of equivalent sound level,equivalent time and prediction model of railway noise,a spacious space was selected as the testing spot in this paper,and two methods were applied to record the noise strength and lasting time when the train was passing by in 30maway from the center of outward track,then the results were used to predict the one hour equivalent continuous A lever in 60m,which would compare with the testing result in 60m.The results shown that when the loudest noise was used as noise source,and the lasting time between passing and leaving nearby as equivalent time,the error of prediction results and monitoring results ranged-0.3-0.9 dB(A)and the variance was 0.229,the prediction was coincided with monitoring results and had lower dispersed degree.On the basis of experimental results,this paper analyzed the reasons causing deviation and proposed suggestion to reduce deviation.更多还原