Experimentele Modale Analyse LES 1 – THEORETISCHE INLEIDING Patrick Guillaume E-mail: patrick.guillaume@vub.ac.be Tel.: 02/6293566 28-11-2018 EXPERIMENTELE MODALE ANALYSIS, LES 1

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

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

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

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

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

Amplitude Real Phase Imag EXPERIMENTELE MODALE ANALYSIS, LES 1

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

Introduction Mode shapes EXPERIMENTELE MODALE ANALYSIS, LES 1

Introduction Waterfall plot EXPERIMENTELE MODALE ANALYSIS, LES 1

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

Introduction FFT Analyzer EXPERIMENTELE MODALE ANALYSIS, LES 1

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

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

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

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

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

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

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

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

Introduction Breakdown of an FRF EXPERIMENTELE MODALE ANALYSIS, LES 1

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

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