- Room 10-7
Engineering 1 Building
Department of Mechanical and Aeronautical Engineering
University of Pretoria
Pretoria - +2712 420 2432
- Mechanical Engineering, Structural Dynamics, Vibrations, Structural Health Monitoring, Optical Measurement Methods, Condition Monitoring, and 9 moreStructural Vibrations, Physical Asset Management, Digital Image Correlation, Scanning Laser Vibrometry, Mining Engineering, Damage detection, Rotordynamics, Experimental Modal Analysis, and Dynamic Vibration Absorberedit
- Stephan Heyns received his BSc degree in mechanical engineering in 1978 (cum Laude) and his PhD in 1988 from the Univ... moreStephan Heyns received his BSc degree in mechanical engineering in 1978 (cum Laude) and his PhD in 1988 from the University of Pretoria in South Africa. He started his professional career in 1979 at the Council for Scientific and Industrial Research in South Africa where he was responsible for gas-turbine design. In 1982 he joined the Department of Mechanical and Aeronautical Engineering at the University of Pretoria. Presently he is head of the Dynamic Systems Group at the University of Pretoria as well as the Sasol Laboratory for Structural Mechanics. He is also heading a Centre for Physical Asset Management and Condition Assesment at the university. His current research interests are focused on machine and structural health diagnostics and prognostics, vibration analysis, vibration measurement techniques and model updating. He is an accredited researcher with the National Research Foundation in South Africa as well as a Fellow of the South African Academy of Engineering. He is also Fellow and past-president of the Southern African Acoustics Institute.edit
The effect of the rotational speed and axial torque on the diagnostics of tapered rolling element bearing defects was investigated. The accelerometer was mounted on the bearing housing and connected to Sound and Vibration Analyzer (SVAN... more
The effect of the rotational speed and axial torque on the diagnostics of tapered rolling element bearing defects was investigated. The accelerometer was mounted on the bearing housing and connected to Sound and Vibration Analyzer (SVAN 958) and was used to measure the accelerations from the bearing housing. The data obtained from the bearing was processed to detect damage of the bearing using statistical tools and the results were subsequently analyzed to see if bearing damage had been captured. From this study it can be seen that damage is more evident when the bearing is loaded. Also, at the incipient stage of damage the crest factor and kurtosis values are high but as time progresses the crest factors and kurtosis values decrease whereas the peak and RMS values are low at the incipient stage but increase with damage. Keywords—crest factor, damage detection, kurtosis, RMS, tapered roller bearing.
