14 W. H. Semke et al. Fig. 2.7 DJI OEM 9450S Quick-Release Propeller Comparison of Damaged and Undamaged Propellers. (a) Noise Level Spectrum (b) Sound Pressure Spectrum Fig. 2.8 BTG 9450S Quick-Release Propeller Comparison of Damaged and Undamaged Propellers. (a) Noise Level Spectrum (b) Sound Pressure Spectrum Table 2.3 Summary of Sound Pressure Level of the DJI Phantom 4 Pro with Various Propeller Configurations BladeType Sound Pressure Level (dB) Increase (dB) DJI OEM Standard 74 4 DJI OEM Standard Damaged 78 BTG Standard 76 4 BTG Standard Damaged 80 DJI OEM Low-Noise 74 1 DJI OEM Low-Noise Damaged 75 Helistar Low-Noise 74 0 Helistar Low-Noise Damaged 74 clearly show a correlation in frequency peaks between vibration and noise measurements. However, no definite conclusion can be drawn for the amplitude correlation between those two types of measurements.
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