How to separate unbalance from misalignment and reasons we get the M’s and W’s in the waveform and why we may not

Clyde, Volpe, Vibration Institute of Australia


Unbalance and misalignment are two common fault conditions, but they share similar symptoms, especially in the spectrum. This presentation will discuss why we see the vibration patterns that we commonly observe, and then look more closely at the time waveform. It is common to view an “M” or “W” shape in the waveform, but that is not always the case. This presentation will explain the reason why we see those patterns, and why sometimes we do not.


Clyde started his career in a paper mill and qualified as an electrical technician. He soon realised his passion was teaching though so in 1990 Clyde started the Vibration Institute of South Africa, this Institute soon became a leading training company there. In 2000 he moved to Australia and in 2003 started The Vibration Institute of Australia, he now runs courses throughout the world and is the Mobius agent for Australia and New Zealand. Further he has also done work in many industries helping set up their databases. Clyde has trained over 10000 people during his life, his focus is to change the ways companies think about Condition Monitoring, guiding them towards a more holistic idea of Reliability Maintenance. He has also given talks around the world.