高速列车等效通过时间预测

Prediction of High-Speed Train Equivalent Pass-By Duration

建立了300~380 km·h^-1运行高速列车等效通过时间预测模型,并编制了计算程序.基于高速列车车外噪声试验和声源分析,在理想偶极子声源声传递关系基础上考虑指向性修正、多声源模型和时间延迟效应,结合京沪铁路噪声测试数据优化预测模型,预测结果与实测值在不同速度和不同距离下都有很好的一致性.高速列车等效通过时间系数随速度的增大逐渐增加,在近点与远点位置呈现不同的变化规律,以往认为等效通过时间在近点位置等于l/v的结论在高速下已不成立.

A prediction model was established for the high-speed train equivalent pass-by duration at a speed of 300 to 380 km·h^-1, and the corresponding calculating program was written. Based on the test and analysis of high-speed train noise, the directivity index, multi-source model and travel time correction were utilized to adjust and improve the numerical study of dipole source acoustic radiation. The validity of the prediction model was checked against the 300 to 380 km·h^-1 experimental results, which was in good agreement. The equivalent pass-by duration coefficient of high-speed trains increases gradually with the increase of speed and presents an opposite tendency at the near field and far field distance. The previous conclusion that the equivalent pass-by duration at the near field is equal to l/v is no longer true at high speed.