Table 2 Statistical results of acoustic...

Table 2

Statistical results of acoustic roughness for high-speed railway rails

Wavelength (cm)	Mean (dB)	Standard deviation (dB)	Median (dB)
79.433	18.7	1.9	18.5
63.096	16.9	2.6	16.8
50.119	11.7	2	12
39.811	9.9	2.5	9.6
31.623	9.1	2	8.7
25.119	8.3	2.6	8.7
19.953	6.7	2.5	6.3
15.849	4.8	2.5	4.9
12.589	4	3.2	2.9
10	1.3	3.6	0.8
7.943	−0.6	4.6	−2.3
6.31	2.1	5.2	0.5
5.012	0.5	4.4	0.2
3.981	−4.1	4.1	−4.5
3.162	−2.4	3.1	−2.4
2.512	0.1	3.9	−0.6
1.995	0	3	−0.1
1.585	−3.4	3	−2.8
1.259	−1.3	2.6	−1.1
1	−2	3.3	−2.8
0.794	−2.6	2.7	−2.2
0.631	−2.1	2.5	−2.1
0.501	−2.6	3	−2.8

Wavelength (cm)	Mean (dB)	Standard deviation (dB)	Median (dB)
79.433	18.7	1.9	18.5
63.096	16.9	2.6	16.8
50.119	11.7	2	12
39.811	9.9	2.5	9.6
31.623	9.1	2	8.7
25.119	8.3	2.6	8.7
19.953	6.7	2.5	6.3
15.849	4.8	2.5	4.9
12.589	4	3.2	2.9
10	1.3	3.6	0.8
7.943	−0.6	4.6	−2.3
6.31	2.1	5.2	0.5
5.012	0.5	4.4	0.2
3.981	−4.1	4.1	−4.5
3.162	−2.4	3.1	−2.4
2.512	0.1	3.9	−0.6
1.995	0	3	−0.1
1.585	−3.4	3	−2.8
1.259	−1.3	2.6	−1.1
1	−2	3.3	−2.8
0.794	−2.6	2.7	−2.2
0.631	−2.1	2.5	−2.1
0.501	−2.6	3	−2.8

Source(s): Authors’ own work