Curve squeal noise is one of the most prominent noises among railway noises. High levels of noise are generated when a train passes through curved sections, resulting in several complaints from the residents and vehicle passengers. To mitigate this problem, the squeal noise was attempted to be mitigated by laser cladding the composite material on the head of the rail. First, the effect of the negative gradient of the coefficient of friction on the squeal noise was theoretically examined. A simple model analysis indicated that the vibration of the wheel increased rapidly when the vibration system involved instability characteristics. In addition, the change in the friction coefficient owing to the local coating of the rail with a low friction material was investigated using a roller rig test equipment. The results demonstrated that the negative friction coefficient did not occur when the contact position between the wheel and rail was locally coated. Furthermore, the effect of the low friction local coating on the squeal noise in the curve section was examined in operational rails. The comparison of the results obtained before and after the local coating confirmed that the local coating of the rail can effectively reduce the squeal noise.

弯道尖叫声是铁路噪声中最突出的噪声之一。火车经过弯道时会产生很大的噪音，导致居民和乘车人的抱怨。为了减轻这个问题，试图通过将复合材料激光熔覆在轨道的头部上来减轻尖叫声。首先，从理论上研究了摩擦系数的负梯度对尖叫声的影响。一个简单的模型分析表明，当振动系统具有不稳定性特性时，车轮的振动会迅速增加。此外，还使用滚装试验机研究了由于低摩擦材料的钢轨局部覆盖而导致的摩擦系数变化。结果表明，当车轮和轨道之间的接触位置局部涂覆时，不会出现负摩擦系数。此外，在操作导轨中检查了低摩擦局部涂层对弯道尖叫声的影响。通过对局部涂覆前后的结果进行比较，可以确认轨道的局部涂覆可以有效降低尖叫声。