基于互功率谱的时延估计，可以得到很精确的幅值、频率、相位估计，是一种双隐层反向传播神经网络，多元数据分析的主分量分析投影，数据模型归一化，模态振动。- Based on the time delay estimation of power spectrum, You can get a very accurate amplitude, frequency, phase estimation, Is a two hidden layer back propagation neural network, Principal component analysis of multivariate data analysis projection, Normalized data model, modal vibration.