An Experimental Investigation into the Difference in the External Noise Behavior of a High-Speed Train between Viaduct and Embankment Sections

Table 3

Linear fitting results of radiating sound power level in typical regions.

Region	Operational section	Speed range (km/h)	L = β × lg(V/V0) + L0
			β	L0	R^2
Entire train	Viaduct	160 ≤ V ≤ 250	19.68	124.97	0.97
		250 ≤ V ≤ 350	34.42	120.83	0.98
	Embankment	160 ≤ V ≤ 250	20.85	125.44	0.94
		250 ≤ V ≤ 350	35.68	121.78	0.98
Lower	Viaduct	160 ≤ V ≤ 250	18.66	124.46	0.98
		250 ≤ V ≤ 350	31.15	121.66	0.95
	Embankment	160 ≤ V ≤ 250	19.42	124.71	0.93
		250 ≤ V ≤ 350	32.35	121.93	0.92
Bogie	Viaduct	160 ≤ V ≤ 250	17.82	121.59	0.94
		250 ≤ V ≤ 350	31.52	117.49	0.94
	Embankment	160 ≤ V ≤ 250	18.73	121.73	0.96
		250 ≤ V ≤ 350	33.67	117.97	0.92
Pantograph	Viaduct	160 ≤ V ≤ 350	52.53	103.11	0.95
	Embankment	160 ≤ V ≤ 350	51.45	104.12	0.95