Since vibration data contains many hints for
process, result, and prediction, it is one of the monitoring parameters used
for analyzing failures, detecting risks, and extending life. In order to
measure this vibration, you need a sensor, measuring instrument, and analysis
program, but you cannot get the same result by simply turning on the radio and
listening to it without education. Some people ask for analysis after storing
vibration data on a recorder like storing music on a recorder. It seems that
the method of storage was not very important. At this time, I would like to
talk about the following.
Basics for collecting correct vibration data
The
following is basic, but you should know the importance of measurement, and you
will be able to see how the results of measuring without procedures were a
waste of time.
Unlike temperature measurement, where you can select
only Celsius or Fahrenheit and press a button, you need to know a lot about
'vibration' before measuring. How to select units and how far is the frequency range? What
are the types of sensors and how to attach them? Also where? in which
direction? Everyone should know how to measure. As a metaphor, 'knowledge
is something that is easy for those who know it, unlike wisdom that is
difficult even if you know it.' If you know about the vibration, it is easy to
measure the selectivity of the instrument.
Distinct difference between vibrometer
(vibrometer and frequency analyzer FFT vibration analyzer)
Recent vibrometers that can perform simple spectrum
frequency analysis and trend storage are being sold at low prices, but in
general, vibrometers do not have as precise or diverse functions as FFT
(vibration frequency analyzer). Therefore, it is necessary to know the
practical optimal knowledge that can identify these differences, and refer to
the following.
item
vibrometer
Frequency
analyzer (FFT, multi-channel vibration analyzer)
Appearance
output
Types and uses of instrumentation
Magnet-attached or probe-type machine
surface vibration measurement, machine condition management
Select
the number of simultaneous measurement channels, whether to measure FRF
(resonance), machine diagnosis, long term recording (DAQ), rotor dynamics,
front-end or hand held, for Labs and machine analysis
Sensor selection
-The magnet attached type is better than
the probe stick type because measurement stability and high frequency are
possible.
-Sensitivity modifiable instrument (high sensitivity,
high impact measurement possible)
-Sensitivity
modifiable instrument (high sensitivity, high impact measurement possible)
-For low
frequency detection (using displacement sensor and DC sensor, or using
acceleration of 500mV/g or higher)
-General
type acceleration sensor (100mV/g)
-High
impact acceleration sensor (10mV/g)
Unit
This data is very
realistic and it is the result confirmed in the actual domestic industrial
field, but it can be subjective and biased, so please refer to it.
