Case Study: Advantages Of Using Band Filters with Acceleration Envelope
Introduction:
Case Study performed by V.I.T.S. (Vibration Integrated Technology Services LTD) Michelle Charlebois in Ontario, Canada – ERBESSD Instruments Distributor
Where: Paper Mill – Dryer Can Bearing – Inside Race Fault – February 2023
Equipment Used: ERBESSD WiSER 3X (as Route Data Collector)
Software Used: ERBESSD DigiVibe
Findings: Can #13 Drive Side bearing’s readings indicate an inside race fault-cracked (suspect it has gone up the taper)
Recommendation: Suggest changing bearing out before shaft or housing damage occurs.
Before band pass filter applied
Amplitude will not necessarily change or determine the severity of the fault with heavy mass equipment. Frequency content is crucial for slow speed analysis.
Apply a Band Filter at the frequency range that the bearing rings to emphasize the bearing fault
When the High Pass Band Filter is applied the inside race fault is seen clearly with the running speed sidebands
After Band Pass Filter Applied:
On equipment that you are not familiar with, you should experiment with several filters because you do not always know where the bearing rings.
ERBESSD DigiVibe software is capable of applying different band filters, a useful tool for an analyst.
Corrective Actions:
The paper Mill planned to have the bearing replaced before further damage occurs.
Avoidance:
Potential catastrophic failure, shaft and/or housing damage. Example of when a taper bore bearing cracks, one set roller ends up taking the load. Similar bearing failure that ran for.1 week after the inside race crack was diagnosed. A cracked bearing can produce catastrophic failure in the shortest time period than any other bearing failure, except maybe cage failure.
