统计能量法及其在提速客车噪声预测中的应用

为了预测提速客车内部噪声能量分布及噪声传递路径，用统计能量法对其进行了分析，讨论了统计能量法分析复杂振声系统的基本原理及稳态振声系统统计能量分析的基本方程．以唐山车辆厂提速客车为应用实例，获得了车内总的声功率在车底架、窗玻璃等主要传递路径上的能量分布，并给出了车窗双层玻璃不同厚度的高频响应以及车底架地板涂抹阻尼材料吸收低频声能的机理的治理措施。

Statistical Energy Analysis and Its Application in High-Speed Passenger Train

The interior noise of passenger train is increased with the rise in running speed.Due to its complexity,Statistical Energy Analysis (SEA) is applied to the passenger train for forecasting the interior noise.Fundamental principle of and basic equation of SEA in steady state are discussed for the complex acoustic-vibration system.An increasing speed passenger train of Tangshan locomotive and train factory is investigated with SEA as an example,and the distributions of acoustic-power and its transmission path of interior noise related to floor and window glass are obtained.Based on these results,some measures for reducing the noise level,such as taking different thickness between two window glasses and spreading on damping material under the bottom frame,are suggested as well.