列车轮对轴承故障是危及列车运行安全的重要因素之一，对其准确检测是高速重载列车需要解决的关键问题。当轮对轴承出现异常时，其振动信号中的幅值就会出现突变点，据此提出了利用频谱细化技术对轮对轴承的振动加速度信号进行分析的方法。实验结果表明，该方法实现了轮对轴承异常的高精度检测，说明这种方法比常规的方法能更有效地检测出轮对轴承的异常状态。

The fault of wheelset bearing is one of the most important factors which is deangerous to the satfy of the train running. And the key problem that should be solved firstly is the accur ate measurement method for the high speed heavy haul locomotive. Since there are some discontinuity points in the amplitude of the vibration signals when the wheelset bearing is abnormal, a method for analyzing the vibration acceleration signals which come from the wheelset bearing by using the spectrum zoom is prsented. The experiments indicate that the abnormity of wheelset bearing high-accuracy detection can be realized by using this method, and this method can detect the abnormity effectively compared to the commonly used methods.