RMS Ultrasonics Analysis Services: Multi-frequency sonic/ultrasonic analysis can be used to monitor grease,
the Achilles’ heel of lubricant condition monitoring. Although grease analysis is practical from a testing point of view, it is impractical from a sampling point of view. Considering the numbers of machines that are grease lubricated, this problem, “How to do condition monitoring on grease?” is a serious one that needs to be addressed.
Maintenance professionals often report the biggest problems with their tribology program are over-greasing, under-greasing, wrong grease, and sometimes no grease at all. Over-greasing causes high temperatures and results in shedding of oil from grease. Under-greasing causes inadequate lubricant delivery. The wrong grease in a bearing also has the same effect. It doesn’t properly deliver oil to the loaded rollers. All these result in lubricant-starved bearings. These problems (over-greasing, under-greasing, wrong grease, and no grease at all) cause increased energy loss due to friction. This energy shows up as mechanical energy (ultrasonic) and thermal energy (heat).
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