1. Luleå Vetenskapenshus, 2016-11-14
THE NORTHERNMOST UNIVERSITY
of Technology in Scandinavia
Research on Elastic Waves and its contribution to Condition Monitoring of Machine elements
Stephan Schnabel
TriboDays 2016
Luleå Vetenskapenshus,

2. ELASTIC WAVE Cam followers Rolling element bearings Gears
TriboDays 2016
© Stephan Schnabel

3. ELASTIC WAVE Cam followers Rolling element bearings Gears
Is it possible to relate acoustic emission signals of a component setups to acoustic emission signals of complete machine elements, such as rolling element bearings?
Rolling element bearings
Gears
TriboDays 2016
© Stephan Schnabel

4. ELASTIC WAVES as a MONITORING TOOL
[1]
[2]
[1]
[2] Uadiale,S. et.al., ”Overview of problems and solutions in fire protection engineering of Wind Turbines”, Fire safety – proceedings of the 11th international symposium, 2014, pp
TriboDays 2016
© Stephan Schnabel

5. ELASTIC WAVE
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© Stephan Schnabel

6. Plastic deformation signal Transient force signal
ELASTIC WAVE
Plastic deformation signal
Transient force signal Δs Δs
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© Stephan Schnabel

7. EXPERIMENTAL SETUP Δs AE F Δs Material: Ferrite, Bainite Δs/dt [mm/s]:
0.03, 0.07, 0.1, 0.3, 0.5,
Test procedure: AE Δs t Δs t F Δs
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© Stephan Schnabel

8. TENSILE TESTS Δs t
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© Stephan Schnabel

9. TENSILE TESTS YIELD POINT
Rectified and Scaled
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© Stephan Schnabel

10. TENSILE TESTS YIELD POINT
Data limitation
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© Stephan Schnabel

11. TENSILE TESTS YIELD POINT
Data extraction
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© Stephan Schnabel

12. TENSILE TESTS – SPEED DEPENDENCY
AE amplitude
rpm
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© Stephan Schnabel

13. Plastic deformation signal Transient force signal
ELASTIC WAVE
Plastic deformation signal
Transient force signal Δs Δs
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© Stephan Schnabel

14. EXPERIMENTAL SETUP D h
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© Stephan Schnabel

15. TRANSIENT FORCE – AMPLITUDE/TIME
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© Stephan Schnabel

16. TRANSIENT FORCE – AMPLITUDE/TIME
AE RMS
rpm
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© Stephan Schnabel

17. AE SOURCES Plastic deformation Transient forces TriboDays 2016
© Stephan Schnabel

18. AE of CONTAMINATED BEARINGS AE of CONTAMINATED BEARINGS
Combined signal
Plastic deformation signal
Transient force signal
Estimated RMS Value based on Impact tests
Mark the lines with names
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© Stephan Schnabel

19. AE of CONTAMINATED BEARINGS
Plastic deformation
Transient force
Explain the difference better
Show just one test 1
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© Stephan Schnabel

20. CONCLUSIONS
Is it possible to relate acoustic emission signals of a component setups to acoustic emission signals of complete machine elements, such as rolling element bearings?
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© Stephan Schnabel

21. Additional research at LTU UTC
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© Stephan Schnabel

22. AKNOWLEDGEMENT University Technology Center TriboDays 2016
© Stephan Schnabel

23. THANK YOU FOR LISTENING!?
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© Stephan Schnabel