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

Table 1

Parameters about the smartphone and sensors.

Device	Item	Parameter
Smartphone	Model	FRD-AL00
	Operating system	Android 8.0
	Chipset	HiSilicon Kirin 950
	CPU	Octa-core (4 × 2.3 GHz and 4 × 1.8 GHz)
	GPU	Mali-T880 MP4
	Memory	4 GB RAM
Inertial measurement unit	Model	LSM6DS3
	Acceleration range	±2/±4/±8/±16 g
	Angular rate range	±25/±250/±500 dps
	Analog supply voltage	1.71 V to 3.6 V
	Power consumption	1.25 mA
Microphone sensors	Model	MP34DB02
	Frequency range	20 Hz to 20 kHz
	Supply voltage range	1.64 V to 3.6 V
	Acoustic overload point	120 dBSPL
	Signal-to-noise ratio	62.6 dB
	Sensitivity	−26 dBFS