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Webinar: Vibrations & Transformation of Waves
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When: Thursday, October 29, 2020
6:00 PM
Where: Microsoft Teams
South Africa
Craig Long
Portia Moketla

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Synopsis:  Mechanical engineers are  mostly comfortable with mechanical vibrations (or at lest with the subject matter!), but the characteristics of propagating waves are usually a little less familiar.  This talk will introduce propagating elastic waves and their relation to mechanical vibrations, consider some interesting wave phenomena and present a particular application of guided elastic waves to detect damage in train rails.

This topic has practical applications which will be highlighted, as vibrations and waves are exploited in numerous structural health  monitoring and inspection applications.  High frequency ultrasound is used routinely in non-destructive testing (NDT) applications, and vibration modal analysis can be used to detect damage and monitor the integrity of structures.  Another, arguably lesser know, application is that of guided wave ultrasound, which can be used to inspect large volumes of a structure from a fixed transducer location.  Since guided wave ultrasound is generally not well know, a commercial application of the method to detect defects in broken rails will be considered in some more detail.  

About the speaker:  Craig Long is a senior research engineer at the CSIR, where he has worked across the cycle of innovation to respond to industry-relevant challenges.  Craig attended the University of Pretoria, where he completed his Ph.D in Mechanical Engineering in 2007 and has been employed at the CSIR since 2006 (except for approximately 2 years, when he worked at Airbus DS Optronics in Irene).  His interests include guide wave ultrasound, numerical modelling and simulation, machine leaning and structural health monitoring.

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