The word freedom is also used as a
vibration engineering term, and is used together with coordinate angle (degree)
to mathematically express the motion and vibration phenomenon of an object. In
other words, in vibration, there must be coordinates to express the vibrating
object in terms of the amplitude and frequency of displacement, velocity, and
acceleration, and in this case, the term ‘degree of freedom’ of vibration is
used. I think freedom is the same as intrinsic (#Eigen value;
natural). This is because the state that gives rise to
its unique characteristics is freedom itself.
Degree of freedom (DOF) &
Free vibration (Natural; Free vibration)
The number of coordinates that
express the behavior of a system is called ‘degrees of freedom.’
If a dangerous state of a rotating machine is identified
in advance or the machine suddenly breaks down, production is disrupted and
huge asset losses occur. Therefore, in order to check the maintenance time
while looking at the status (CBM), 'monitoring' must be performed and a 'monitoring system' must be installed or
operated. As a monitoring method, the vibration of the facility is measured
regularly in the field and sensing is performed by installing a continuous
monitoring online system. But what is 'monitoring measurement technology'? The monitoring
measurement technology is also divided into two parts as above, which are 'shaft vibration and casing
vibration'. As for this distinction, even among those who specialize in
vibration research, if you have not experienced the general field facility
management method, you may not know the exact difference. This is very common
in the current industrial field, but let's look at the direct differences in
monitoring measurement technology that can never be confirmed theoretically.
Vibration in a rotating machine starts when the shaft
rotates and excitation force (centrifugal force) is generated. Therefore, it is
best to directly measure shaft vibration (shaft vibration measurement method),
but this method has technical limitations. Therefore, a method of measuring
where the shaft vibration is transmitted to the bearing housing or casing is
often used, and this is commonly referred to as 'bearing housing vibration' or
'casing vibration'. This difference was sorted out.
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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.
