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Franklin Lakes, United States

Johnson M.,Advanced Machine Reliability Resources
Tribology and Lubrication Technology | Year: 2012

Ultrasonic analysis has become a popular way to tune and improve greased bearing lubrication. While machine condition analysis, including measurement for presence of a lubricating film, is useful in helping equipment owners determine the effectiveness of the lubricant film in machines with rolling contacts, ultrasonic energy measurement is useful in other ways. A discussion covers the bearing surface; rolling contact interaction; quality of the elastohydrodynamic oil film in oiled greased bearings; options for sensor placement and data collection; and common interferences contributing to signal loss when sound travels. Source


Johnson M.,Advanced Machine Reliability Resources
Tribology and Lubrication Technology | Year: 2012

High-frequency energy is produced when the naturally occurring asperities at two interacting surfaces collide under force. The impact creates a compression wave that propagates through the machine. There are different names for this energy medium, but in the end each represent a way to look at highfrequency energy production. As the number of asperity contacts increase (which coincides with the progressive loss of the oil film) the amount of measurable energy increases. There is a variety of interferences common to ultrasonic frequency collection, including material defects, differences in impedance and reflection/ refraction. With fundamentally sound data collection techniques that deliver dependable, repeatable data, reliability engineers can systematically measure for lubricant film formation or loss of lubricant films in some critical machines. Source


Johnson M.,Advanced Machine Reliability Resources
Tribology and Lubrication Technology | Year: 2012

Lubricant suppliers have often established intervals as a value-added service to their customers. This is biased toward lubricant health and focuses on the low end of the value offering available from the effort, i.e., the oil change. A discussion on options to consider before setting an oil sample frequency for machines covers the rate of progression to failure; machine criticality ranking; environmental stress rating; machine health status; frequency factors; baseline sample interval; and sample calculation. Source


Johnson M.,Advanced Machine Reliability Resources
Tribology and Lubrication Technology | Year: 2010

Lubricant, when properly selected and maintained, provides surface clearance that also enables effective energy use. This aspect of machine lubrication is overlooked, as is human energy use. A discussion covers the strong theory behind reduced better lubrication practices; how most plants could save huge amounts of money by improving their human energy use; and a six-step lubricant evaluation process that reduces energy consumption. Source


Johnson M.,Advanced Machine Reliability Resources
Tribology and Lubrication Technology | Year: 2010

Rate- of-change (ROC) and volume-compensation alarms, which are common process alarms that could be effectively used to track machine conditions operating under a variety of considerations are presented. When coupled with top-up volume normalization, ROC alarms may help the engineer make decisions about the lubricant's long-term surface protection characteristics, something difficult to track with routine lubricant-analysis processes. Aside from wear debris analysis, this technique also could be used to measure contamination control effectiveness for hydraulic and circulation systems and improve sump life- cycle management. Coupled with oil top-up volumes, this method could be used to gauge engine wear for large industrial engines driving ships, trucks and vehicles. Particularly, as it pertains to wear debris for engines, the small wear particle size in engine oil analysis is below typical OEM filter element capture size, meaning wear data should be well represented. Source

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