Condmaster Ruby Module Vibration Expert (Incl. MOD135/137/194)
The MOD193 Vibration Expert is a module in Condmaster Ruby for use with the portable instrument Leonova Diamond. As a combination of modules MOD135, MOD137 and MOD194, the Vibration Expert module contains:
EVAM which generates three sets of machine condition data:
- Condition parameters, which are measured and calculated values describing various aspects of machine vibration
- Vibration spectra where significant line patterns are found, highlighted and evaluated with the preset fault symptoms
- Machine specific condition codes (green – yellow – red) and condition values, based on a statistical evaluation of the condition parameters and symptom values
For each measuring point, the user can make an individual selection and defi ne the type of data best suited for the surveillance of an individual machine. Alternatives include:
- Enveloping HD ENV
- Time Synchronous Averaging
- Band values and averaging of measurement results for improved alert reliability; The number of false alerts is minimized by filtering out randomly high readings caused by disturbance; As an alternative to spectrum analysis, cepstrum analysis can be used for gearboxes
HD ENV is used to complement 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 damages and gear damage - the method utilizes cleverly engineered algorithms for digital signal processing to obtain optimal data for trending purposes.
Run up/coast down records the changes in vibration while the machine is run up to operating speed or after it has been shut off and is slowing down. For this test, both the signal unit and the unit for the spectrum can be selected.
Bump test is employed to check out the typical vibration response of a machine structure at standstill, by hitting it e.g. with rubber mallet (bump test).
Frequency Response Function (FRF) is used to measure the vibration response (natural frequencies) of a machine structure, similar to the ‘Bump test’. FRF however is more sophisticated, measuring the response resulting from a known applied input by using an impact hammer and a vibration transducer connected to Leonova Diamond’s vibration input using a split cable.
Extended resolution and frequency range are sometimes required for FFT with symptoms, EVAM, SPM HD Expert or HD ENV, e.g. when monitoring high-speed gearboxes in turbines. Vibration Expert provides 25 600 lines and 40 KHz.
Order Tracking is primarily used for analysis on variable speed machines. The method uses multiples of rotational speed (orders), rather than absolute frequency (Hz). The number of orders is input by the user. Order Tracking also minimizes the risk of smearing in spectrums.