Forecasting Urban Rail Transit Vehicle Interior Noise and Its Applications in Railway Alignment Design

Table 2

Features involved in the prediction model.

	Collected signal	Used signal	Selected features
1	Audio signal	SPL(A)	RMS
2	Horizontal acceleration	Horizontal acceleration	Mean value
3	Vertical acceleration	Vertical acceleration	RMS
4	Longitudinal acceleration	Longitudinal acceleration	Variance
5	Pitch angular velocity	Pitch angular velocity	Standard deviation
6	Yaw angular velocity	Yaw angular velocity	Peak value
7	Roll angular velocity	Roll angular velocity	Skewness
8		Pitch angular acceleration	Kurtosis
9		Yaw angular acceleration	Shape factor
10		Roll angular acceleration	Crest factor
11		Operating velocity of trains	Clearance factor