
APPENDIXI. VIBRATIONS
B–65152E/03
210
The amplitude of the vibration may be indicated with a sine wave as
shown in the figure below. In this case, when the peak–to–peak (P–P)
value of the sine wave is 5µm or less, the vibration level is V5. (When the
value is 10µm or less, the level is V10.)
Time
5µm or less (P–P) = V5
Note the following relationship between the peak–to–peak value and the
vibration speed. The peak–to–peak value can be calculated from the
vibration speed.
Peak–to–peak value: A
Time
A = 6 10
5
V/π/N
A : Peak–to–peak value [µm]
V : Vibration speed [cm/sec]
N : Motor speed [min
–1
]
A vibration can be measured based on the vibration speed to remove
vibrations caused by the current wave and low–frequency vibrations of
the base and other items so that a stable measurement value can be
obtained. Therefore, the vibration speed is useful for measuring
vibrations caused by an unbalanced spinning body.
I.1
DESCRIPTION OF
VIBRATION LEVEL V5
I.2
RELATIONSHIP
BETWEEN THE
AMPLITUDE OF
VIBRATION AND
VIBRATION SPEED