Condition based maintenance (CBM) is a maintenance strategy which monitoring the actual condition of the asset to decide what maintenance need to be done. The &main purpose of CBM is to avoid the unnecessary repairs and all maintenance measures will be carried out if the evidence of physical changes is received, therefore, it's so clear that CBM program will be reduced the cost with decreasing the unnecessary repairs,

-One of the most important module of CBM isvibration Analysis of rotating equipment

Vibration of rotating equipment (whether in aspect of amplitude or other features of vibration) is directly related to status of machines and any changes of the equipment (even insignificant) will be effected on vibration

It should be pointed out that the means of changes inequipment is contain the different meaning such as failure whether mechanical or electrical, conversion loading and etc.

-Vibration problem might be caused by different kind of problem like:

.coupling failure

.bet and pulley failure

.bugs piping

.distortion shell

.imbalance

.curved shaft

.resonance

.mechanical  looseness

.bearing failure

.gear failure

.detective foundation

.electrical Malfunction

There are some number of methods whereby such mode can be analyzed such as:

.Frequency spectrum analysis (FFT Analysis or spectrum)

Analysis of waveform time 

.Envelope Analysis

Analysis of angle phase

.Parameter’s and features of rolling bearings such as BP, BCU, SEE, Crest, K-Factor, Peak Value

.Orbit Analysis