Case Study: Using high resolution Ultrasound data on slow speed bearings

Tom Murphy, MD, Reliability Team Limited


Condition assessment of slow-speed bearings remains an area of difficulty for many vibration analysts. Over the last 10 years, the simplicity of using Ultrasound for this application has been recognised. This presentation reports on some measurements taken on bearings rotating at 3, 2.3 1.6rpm using Ultrasound. The results compare the use of standard Ultrasound with the significantly increased data provided by the new generation of oversampled Ultrasound data.
How to unlock more information by taking more data is explained by comparing the results from the two methods.

1. Ultrasound is great for slow-speed bearings
2. Oversampled data con reveal otherwise hidden defects
3. Ultrasound identifies early stage bearing defects


Tom has been working in Condition Monitoring and Reliability for over 35 years. He is currently training Ultrasound to ASNT and ISO standards and implementing programmes to a huge variety of businesses around the World. Tom has run his own consultancy business, celebrating 25 years this year, which is dedicated to working with customers to improve their Reliability and reduce maintenance costs.