2．3．2频域分解法（FDD） 频域分解法（frequency domain decomposition）是一种频域内由自噪声激励 的参数识别方法，它克服了峰值拾取法的先天不足，原理上是PP法的延伸。
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Operational modal analysis method of bridge was built based on frequency domain and spatial domain decomposition.
利用频域-空间域分解法，建立桥梁运行模态识别方法。
Signals of cutting force and vibration are measured with multi-sensor and features in frequency domain and time-frequency domain are extracted by using wavelet package decomposition.
利用多传感器对切削力和振动信号进行监测，通过频率变换提取切削力特征量，采用小波包分解技术提取振动信号特征量。
The proper orthogonal decomposition(POD) technique was applied to identification random wind pressure time or frequency domain specific property.
应用POD法识别作用在结构表面的脉动风荷载的时频域特性。
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