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Vibration Noise of VT003F

Vibration plates produce mechanical noises due to the friction and impact between moving parts, like bearings and springs. When vibrated, assembled parts can become more or less lose and impact each other to produce mechanical noises. In the case of VT003F, the machine's upper and lower platforms are made of ABS material. The two plates are screwed on the welded metal tube frames. When this structure is vibrated at high frequency, the gaps between the ABS platform and the connecting steel frame allow these two parts impact each other and produce mechanical noises.

Resonance effect amplifies the noise level if the structure and materials are not well designed.

Beside mechanical noises, the vibration generates sound wave noises, which become audible when the vibration frequency is above 20Hz. For a vibration machine with frequency below 40Hz, the sound wave noise has minimum impact on human ears.

We have make a lots of efforts to reduce VT003F's mechanical noise. For machine designed for household use, noise level is critical for user experience. From 2018 to 2020, through optimized design, improved parts precision, higher material performance and better assembly processes, we have had some major achievements in mechanical noise reduction. The improvement information can be found on the VT003F product page.

Below is the VT003F noise measurement report on random samples of 2020 model.

VT003F Vibration Plate Noise Measurement

measure EMF
Sound Level Meter:
RISEPRO Sound Level Meter
Frequency Range: 31.5Hz-8KHz
Measuring Range: 30-130dB
Frequency Weighting: A
Resolution: 0.1 dB
Samples:
The testing samples are 6 units of VT003F High Frequency Vibration Plates randomly selected from one production batch (2020 version)
Source:
The source is selected at the center of the footplate (right above the motor).
Distance from Noise Source:
The meter is placed 6 inches above the machine.

Below are the measurement results.

VT003F Vibration Plate Noise Level Measurement
Frequency Amplitude Lo Amplitude Hi
15 Hz 46 - 48 dBA 46 - 49 dBA
20 Hz 48 - 51 dBA 48 - 51 dBA
25 Hz 48 - 51 dBA 48 - 52 dBA
30 Hz 48 - 52 dBA 56 - 60 dBA
35 Hz 52 - 62 dBA 58 - 65 dBA
40 Hz 58 - 64 dBA 60 - 70 dBA

Maximum noise level measured on VT003F is between 60 dBA and 70 dBA, at the highest vibration frequency (40Hz) and Hi amplitude setting.

Please note that, for the same dBA level, human ears perceive differently about the loudness and annoyance factor on different frequency. For example, 50 dBA at 30Hz sounds much louder than 50 dBA at 20Hz.

Noise Level Comparisons

Environment
Quite basement 20
Living room 40
Library 40
Large office 50
Freeway traffic 70
Heavy traffic 85
Noisy restaurant 85
Electric Appliances
Refrigerator 50-55
Electric toothbrush 50-60
Washing machine 50-75
Dishwasher 55-70
VT003F @ Max 60-70
Vacuum Cleaner 60-85
Hair dryer 60-95

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