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The measuring parameter of vibration adopted is the vibration acceleration or vibration velocity.
The measuring units and measuring method are specified by JB/T 7407-93 and JB/T500009-94. In process of measuring vibration control bearing noise by using acoustics

The level (dB) of vibration acceleration for Deep Groove Ball Bearing is shown Table 4.
The level (μm/S) of vibration velocity for Deep Groove Ball Bearing is shown Table 5.

[ Table 4 ]

THE LEVEL (dB) OF VIBRATION VELOCITY

Bore Diameter Bore Diameter Series 1 Diameter Series 2 Diameter Series 3
Z1 Z2 Z1 Z1 Z2 Z3 Z1 Z2 Z3
3, 4 32 30 28 33 30 28 34 31 29
5, 6 34 32 30 35 32 30 35 33 31
7, 8 36 33 31 36 34 32 - - -
9 38 34 33 38 35 33 - - -
10 40 36 33 40 37 33 42 38 35
12 41 37 35 41 37 33 43 38 35
15, 17 42 38 36 42 39 34 44 40 36
20 43 39 37 44 40 36 46 41 37
25 44 40 38 45 41 38 47 42 38
30 45 41 39 46 42 39 48 43 40
35 47 43 41 48 44 41 50 45 42
40 49 44 42 50 45 42 52 47 43
45 51 46 44 52 47 44 54 49 45


[ Table 5 ]

THE LEVEL (µm/s) OF VIBRATION VELOCITY

Bearing Nominal Bore Diameter
d
 V1 V2 V3
mm Low Freq. Medium Freq. High Freq. Low Freq. Medium Freq. High Freq. Low Freq. Medium Freq. High Freq.
5, 6 90 60 50 58 36 30 35 21 18
7, 8, 9 110 80 65 72 48 40 44 28 24
10, 12 140 100 85 90 60 50 55 35 30
15, 17 180 130 100 110 78 60 65 46 35
20, 22, 25, 28 220 160 125 130 100 75 80 60 45
30, 32, 35 250 200 160 150 120 100 90 75 60
40, 45 300 250 220 180 150 130 110 90 80
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