SPM leonova emerald, User Manual

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E
Vibration measurement
E:3
Vibration analysis techniques
Leonova can be programmed with the following vibration measurement techniques with either
limited or unlimited use.
ISO 10816 is the measuring technique based on the ISO standard with this number. ISO 10816
consists of several parts, each stating measurement conditions and a table of limit values for a
defined machine type. Like ISO 2372, the evaluation of machine condition is based on the RMS
values obtained by broad band measurement over a frequency range up to 1000 Hz. Depending on
machine type, one or more of three measured quantities are used to determine vibration severity:
VEL: the RMS value of vibration velocity in mm/s
ACC: the RMS value of vibration acceleration in m/s
2
DISP: the RMS value of vibration displacement in µm.
Please note that spectrum analysis is not part of the requirements set up by ISO 10816 but an extra
function provided by the Leonova.
EVAM includes all advanced vibration measurement and analysis methods and gives the user a wide
range of choices to adapt the condition measurement to a specific machine. EVAM returns three
distinct sets of data:
Condition parameters: peak, peak-to-peak, the RMS values of vibration velocity, acceleration and
displacement plus values for crest, kurtosis, skewness and noise levels.
Fault symptom values: the amplitude values of selected spectrum line patters connected with
typical machine faults like unbalance, misalignment, gear damage, motor
faults, bearing damage, etc.
COND numbers: dimensionless condition numbers, obtained by a statistical evaluation of
all selected condition parameters and fault symptom values. Condition
numbers are displayed against a green - yellow - red machine condition
scale.
FFT with symptoms is reduced form of EVAM, lacking the statistical evaluation by means of criteria
and possibility to display and save time signal.
Common features for ISO 10816, EVAM and FFT with symptoms are the condition parameters VEL,
ACC, DISP and the spectrum. For an ISO 10816 measuring point, only one spectrum is saved, while
an EVAM/FFT measuring point can have many.
This means that a measuring point set up for ISO
10816 can at any time be converted into an EVAM or FFT with symptoms measuring point.
HD ENV
®
is an ideal complement to conventional vibration techniques, capable of detecting at
a very early stage such machine problems which are generally difficult to find in good time with
non-enveloping techniques, for example bearing and gear damages. HD ENV requires that the
measuring technique ‘Vibration Premium’ or ‘Vibration Supreme’ is active.