Shock and Vibration / 2018 / Article / Fig 22

Research Article

Vibration Characteristics of Underground Structure and Surrounding Soil Underneath High Speed Railway Based on Field Vibration Tests

Figure 22

(a) Cross-correlation function between W1 and W3; (b) first intrinsic mode function (IMF1) based on HHT; (c) second intrinsic mode function (IMF2) based on HHT; (d) PSD frequency spectrum of the correlation function in (a) with the two peaks corresponding to the two intrinsic mode functions.

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