采用１ １２ 维谱分析方法，提取滚动轴承振动信号中由于二次相位耦合产生的非线性特征，定量描述轴承故障．实验结果表明，这种方法可以有效的诊断滚动轴承故障，且对初期故障很敏感 A 12-dimensional spectral analysis method is used to extract the nonlinear characteristics of the rolling bearing vibration signal due to the secondary phase coupling to quantitatively describe the bearing failure. The experimental results show that this method can effectively diagnose rolling bearing failure, and is very sensitive to the initial failure