Marie Curie Europe

TC3: Experimental Dynamics, Model Identification and Damage Detection

TC3: Experimental Dynamics, Model Identification and Damage Detection

A training course coordinated by Fabrizio Vestroni and Guido De Roeck
time:  9-13 June 2008
location: University of Rome, La Sapienza
address: Via Eudossiana 18, Rome,  Italy


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Aim of the course
The demand for enhanced and reliable performance of vibrating structures in terms of weight, comfort, safety, noise and durability is increasing continuously while, at the same time, there is a request for shorter design cycles, longer operating life, minimisation of inspection and repair needs, and reduced costs. The identification of structural models and damage from vibration data is still a topic of ongoing intensive scientific research.

 

So far, a number of powerful and versatile identification methods have proven their robustness in practical applications. One of them is the finite element updating or, more generally, the inverse modeling. By comparing finite element modal results (natural frequencies, mode shapes and modal strains) with their measured counterparts, relevant structural parameters as stiffness, mass and damping can be derived and their variations can be used also for damage assessment and localization. Nowadays, more and more engineering structures are equipped with monitoring systems consisting of sensors, data communication and data processing capabilities. Advances in measurement technology enables the acquisition of massive amounts of data, the interpretation of which in terms of structural health is still a challenging task.

 

The aim of this training course is to perform a detailed review of vibration testing and system identification in structural dynamics. The course will describe all the steps involved in planning, executing, interpreting and applying the results from vibration testing. In the first part, a brief overview of the fundamentals of dynamics, test planning and data analysis will be given. The course will then follow with an extensive description of identification method of  linear systems; different approaches to modal parameter estimation will be described. Relevant techniques for system identification in the time and frequency domains will be introduced; Bayesian techniques; robust global optimization strategies. The attention will be addressed to model updating, regularization techniques and ill-conditioning aspects. This will be a key to the final part of the course, devoted to damage detection. Several case studies concerning bridges, buildings, monuments and mechanical engines will be presented along with some demos.

 
Course Program

Fundamentals of Dynamics Single and multiple degree of freedom (SDOF and MDOF) systems, presentation and properties of Frequency Response Functions (FRFs). Modal Testing Test planning, basic measurement chain, selection and use of transducers. Excitation techniques: impulse, sine, random. Signal Processing Discrete Fourier Transforms, time-frequency analysis, sampling, leakage errors and windows, aliasing, filters, Power Spectral Density and coherence. Modal Parameters Identification Modal parameter estimation methods: input/output methods, output only methods. Response of uncertain systems Interval analysis and fuzzy arithmetics. Estimation of the uncertain field response. Wave Propagation in Structures Types of waves in onedimensional systems (longitudinal, torsional, bending). Wave motion in finite systems. Effect of discontinuities on wave motion. Inverse Problems Ill conditioning, SVD, regularization techniques. Bayesian Techniques Bayesian techniques, correlation between numerical and experimental models, estimators, selection of parameters and measurements, estimate algorithms, sensitivity analysis. Model Updating Correction of finite element matrices and/or parameters by comparison with experimental data. Damage Detection Modelling of damage within finite element models, damage characterization by modal and wave methods. Case Studied


Invited Lecturers

The course will be delivered by recognized professors in the field of dynamics are:

  • Walter D'Ambrogio - Università degli Studi dell'Aquila
  • Guido De Roeck ­- Katholieke Universiteit Leuven
  • Annalisa Fregolent - Università di Roma La Sapienza
  • Vincenzo Gattulli - Università degli Studi dell'Aquila
  • Jean-Louis Guyader - Institut National des Sciences Appliquées de Lyon
  • Michael Hanss - Universitat Stuttgart
  • Michael Link -­ University of Kassel
  • Antonino Morassi - Università di Udine
  • Aldo Sestieri - Università di Roma La Sapienza
  • Fabrizio Vestroni ­- Università di Roma La Sapienza
 

Hosting Institution

Dipartimento di Ingegneria Strutturale e Geotecnica, University of Rome La Sapienza

 

For further information please contact:

Vincenzo Gattulli - The SICON General Secretary -
Piazzale E. Pontieri 2 - 67040 Monteluco di Roio (Italy)
tel. +39 0862 434511, fax +39 0862 434548
http://www.sicon.ing.univaq.it , e-mail: mailto: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

 

Event Time Table

 

Time

Monday

Tuesday

Wednesday

Thursday

Friday

 

June 9

June 10

June 11

June 12

June 13

9:00 ­ 9:45

Introduction - FV

ModalPar-IO -WDA 

Bay Tech - FV

InvPbs - JLG

Damage - AM

9:45-10:30

Fundamentals of Dynamics - FV

ModalPar-IO -WDA 

Bay Tech - FV

InvPbs - JLG

Damage - AM

Coffee Break

11:00-11:45

 Wave Propagation - JLG

ModalPar-IO - WDA

UncertSys - MH 

ModelUpdat - ML

Damage - AM

11:45-12:30

 Wave Propagation - JLG

ModalPar-OO -GDR

UncertSys - MH 

ModelUpdat - ML

Damage - FV

Lunch

14:30-15:15

Rev. Modal Testing - AS

ModalPar-OO -GDR

UncertSys - MH 

ModelUpdat - ML

CaseSt -VG

15:15-16:00

Rev. Modal Testing - AS

Damage -GDR

InvPbs - AF 

ModelUpdat - ML

CaseSt -VG

Coffee Break

16:30-17:15

Signal Processing - AS

Damage -GDR

InvPbs - AF

CaseSt - ML

Discussion/Closure

17:15-18:00

Signal Processing - AS

CaseSt-ModalPar

UncertSys - SG

CaseSt WP-FV

 

       
 
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