说明：  介绍了一种信号处理的新方法，希尔伯特黄变换中的经验模式分解（EMD）.Hilbert-Huang Transform and its Application in Gear Faults Diagnosis
(Introduces a new method of signal processing, Hilbert-Huang Transform Empirical Mode Decomposition (EMD). Hilbert-Huang Transform and its Application in Gear Faults Diagnosis)