Squeal noise of rail-bound vehicles frequently occurs in curves with a small radius and is a major nuisance for transport users and local residents. For the quantification of squeal intensity, a complete vibro-acoustic analysis is developed in this paper. This complete analysis requires time-domain analysis able to introduce non linearities leading to obtain dynamic saturation at the contact zone and a computation of sound radiation of the whole system. For time-domain analysis, a finite element (FE) formulation around the stationary position in an Eulerian reference frame is derived with a fine discretization of the contact surface combined with unilateral and Coulomb friction laws. Appropriate numerical techniques and reduction strategies are then used in order to solve the non linear discrete equations in dynamic self-sustained conditions. Both the transient approach and linear stability analysis are carried out. For sound radiation calculation, the contact forces calculated from wheel/rail contact model are then used for the calculation of squeal noise by using a coupled fluid-structure resolution based on boundary element method for the acoustic part and finite element method for the structural part. Results are first discussed in terms of unstable modes which are consistent between transient and stability analysis. Transient calculation shows that the apparent global friction coefficient during stick-slip cycles is slightly smaller than the constant local friction coefficient, and a dynamic saturation curve with hysteresis considerably different of the quasi-static curve. Finally the sound radiation calculation showed that the sound power radiated from the wheel is dominant with harmonics coming from the contact non linearities.

铁路车辆的尖叫声经常出现在半径较小的弯道中，这对运输用户和当地居民是一个很大的麻烦。为了量化尖叫强度，本文开发了完整的振动声分析。这种完整的分析需要时域分析，该分析能够引入非线性，从而在接触区域获得动态饱和度，并计算整个系统的声辐射。对于时域分析，推导出欧拉参考系中固定位置周围的有限元（FE）公式，并结合单边摩擦和库仑摩擦定律对接触面进行精细离散。然后使用适当的数值技术和归约策略来求解动态自持条件下的非线性离散方程。进行了瞬态方法和线性稳定性分析。为了进行声辐射计算，通过基于声场部分的边界元法和结构部分的有限元法，采用耦合的流体-结构分辨率，将从轮/轨接触模型计算出的接触力用于尖叫声的计算。首先根据不稳定模式来讨论结果，该不稳定模式在瞬态和稳定性分析之间是一致的。瞬态计算表明，粘滑运动过程中的表观整体摩擦系数略小于恒定局部摩擦系数，并且具有滞后性的动态饱和曲线与准静态曲线存在显着差异。