Experimentele Modale Analyse

1. Experimentele Modale Analyse LES 1 – THEORETISCHE INLEIDING Patrick Guillaume E-mail: patrick.guillaume@vub.ac.be Tel.: 02/6293566 EXPERIMENTELE MODALE ANALYSIS, LES 1

2. Overzicht cursus • Theoretische basisbegrippen • Meettechnieken • Niet-parametrische schattingen • Parametrische schattingen • Toepassingen • Gevoeligheidsanalyse • FE Model “updating” • “Substructuring” • “Operationele” modale analyse • “Structural Health Monitoring” • “Flight Flutter Testing” EXPERIMENTELE MODALE ANALYSIS, LES 1

3. Introduction • Simple plate response to sine sweep excitation EXPERIMENTELE MODALE ANALYSIS, LES 1

4. Introduction • Frequency Response Function • Overlay of time (blue) and FRF (red) EXPERIMENTELE MODALE ANALYSIS, LES 1

5. Introduction • Simple plate Sine Dwell Responses • Running-Mode Analysis (in time domain or frequency domain) EXPERIMENTELE MODALE ANALYSIS, LES 1

6. Introduction • FRF of a clamped beam EXPERIMENTELE MODALE ANALYSIS, LES 1

7. Real Amplitude Imag Phase EXPERIMENTELE MODALE ANALYSIS, LES 1

8. Introduction • Roving Hammer impact testing • Driving point FRF (a) and Cross FRF (b) EXPERIMENTELE MODALE ANALYSIS, LES 1

9. Introduction • Mode shapes EXPERIMENTELE MODALE ANALYSIS, LES 1

10. Introduction • Waterfall plot EXPERIMENTELE MODALE ANALYSIS, LES 1

11. Introduction • Roving hammer & roving response scenarios EXPERIMENTELE MODALE ANALYSIS, LES 1

12. Introduction • FFT Analyzer EXPERIMENTELE MODALE ANALYSIS, LES 1

13. Introduction • Impact testing - Hammer tip influence EXPERIMENTELE MODALE ANALYSIS, LES 1

14. Introduction • Impact testing - Exponential window EXPERIMENTELE MODALE ANALYSIS, LES 1

15. Introduction • Shaker testing – Random with Hanning window EXPERIMENTELE MODALE ANALYSIS, LES 1

16. Introduction • Shaker testing – Burst random without window EXPERIMENTELE MODALE ANALYSIS, LES 1

17. Introduction • Shaker testing – Sine chirp without window EXPERIMENTELE MODALE ANALYSIS, LES 1

18. Introduction • Input-output measurement locations EXPERIMENTELE MODALE ANALYSIS, LES 1

19. Introduction • Mode 1 – Peak pick of FRF EXPERIMENTELE MODALE ANALYSIS, LES 1

20. Introduction • Mode 2 – Peak pick of FRF EXPERIMENTELE MODALE ANALYSIS, LES 1

21. Introduction • Breakdown of an FRF EXPERIMENTELE MODALE ANALYSIS, LES 1

22. Introduction • Curve fitting – SDOF vs MOF EXPERIMENTELE MODALE ANALYSIS, LES 1

23. Introduction • Curve fitting of a typical FRF EXPERIMENTELE MODALE ANALYSIS, LES 1