Combined Annoyance Assessment of Subway Train-Induced Structural Vibration and Ambient Noise

Table 2

Classification of annoyance grade.

Grade	Annoyance degree	Remark
F	[0, 0.2)	Near-nil annoyance
E	[0.2, 0.4)	Slight annoyance
D	[0.4, 0.6)	Mild annoyance
C	[0.6, 0.8)	High annoyance
B	[0.8, 1)	Extreme annoyance
A	1	Unbearable