KNOWLEDGE

Bearing Noise and Vibration

Noise and Vibration Detection
10 Aug

Bearing Noise and Vibration Detection:

Bearing noise and vibration – important metrics for bearing quality

Usually we use instrument S0910-1 to detect the noise of ball bearings.
We devide bearing noise into four levels: Z1, Z2, Z3, and Z4.
The higher the level, the lower the noise.

While for bearing vibriation, we use the instrument BVT-1 to detect.
We divide bearing vibration into four levels: Z1, Z2, Z3, and Z4.
The higher the level, the smaller the vibration.

Noise Levels Parameter Table:

Bearing Diameter SO901-1（dB）
Z1 Z2 Z3 Z4
㎜ ≤ ≤ ≤ ≤
3 34 32 28 23
4 34 32 28 23
5 36 34 30 25
6 36 34 30 25
7 38 35 31 26
8 38 35 31 26
9 40 36 32 27
10 42 38 33 28
12 43 39 34 29
15 44 40 35 30
17 44 40 35 30
20 45 41 36 31
25 46 42 38 33
30 47 43 39 35
35 49 45 41 36
40 51 46 42 38

Vibration Levels Parameter Table:

Diameter V (um/s) V1 (um/s) V2 (um/s) V3 (um/s)
d
mm Low Frequency Middle Frequency High frequency Low frequency Middle Frequency High frequency Low Frequency Middle Frequency High frequency Low Frequency Middle Frequency High Frequency
3,4 80 44 44 60 35 32 48 26 22 31 16 10
5,6 110 72 60 74 48 40 58 36 30 35 21 11
7,8,9 130 96 80 92 66 54 72 48 40 44 28 12
10,12 160 120 100 120 80 70 90 60 50 55 35 15
15 210 150 120 150 100 85 110 78 60 65 46 18
17 210 150 120 150 100 85 110 78 60 65 46 25
20 260 190 150 180 125 100 130 100 75 80 60 25
22,25 260 190 150 180 125 100 130 100 75 80 60 32
28 260 190 150 180 125 100 130 100 75 80 60 40
30,32 300 240 190 200 150 130 150 120 100 90 75 40
35 300 240 190 200 150 130 150 120 100 90 75 45
40 360 300 260 240 180 160 180 150 130 110 90 50
45 360 300 260 240 180 160 180 150 130 110 90 60
50 420 320 320 280 200 200 210 160 160 125 100 70

Is Bearing Accuracy Standard Related to Noise Level?

Generally, the accuracy of bearings has nothing to do with the noise level. They are two different grade standards.
As long as we measure bearing accuracy according to rotation accuracy and dimensional accuracy. While we judge noise by the decibel value of the abnormal sound during rotation. One is size and the other is decibel value.
Therefore, bearing accuracy standard has nothing to do with noise level.

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