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
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