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ISMA35 Course on Modal Analysis : Theory and Practice,
23-24 September 2010
About the course
This two day course on modal analysis is organised for the 35th
time by the Department of Mechanical Engineering of the Katholieke
Universiteit Leuven. The course is set up as a general introduction
with emphasis on data-acquisition and multi-channel modal testing.
It is an intensive training course, where theoretical lectures are
illustrated by numerous integrated demonstrations. A full scale
multi-channel survey of a real life structure will be conducted and
lectures on relevant industrial case studies are included. The mix
of theory and practice gives the participants the opportunity to
discuss theoretical and practical problems with experts in the
field. The last part of the course touches on the practical use and
applications of modal analysis ranging from trouble shooting to
model updating.
Who should attend
The intensive course on Modal Analysis Theory and Practice is
mainly oriented towards newcomers in the field of modal testing who
have some background in the field of structural dynamics. However,
since the course deals with state of the art techniques in modal
testing, more experienced persons may wish to participate in order
to update their knowledge.
Organising committee
K.U.Leuven, Department of Mechanical Engineering, Division of
Production Engineering, Machine Design and Automation (PMA)
Prof. W. Heylen, Course Chairman,
Prof. P. Sas, Prof. D. Vandepitte, K. Vergote.
Course administrator
Mrs. L. Notré
K.U.Leuven Department of Mechanical Engineering, PMA
Celestijnenlaan 300B, B-3001 Leuven, BELGIUM
Tel (+32) 16 32 24 82; Fax (+32) 16 32 29 87
e-mail : lieve.notre(@)mech.kuleuven.be
General information
Registration fee
The registration fee is € 900. A reduction of 50% will be
granted to students. Fee includes lecture notes, lunch and
refreshments during break periods.
Location and language
The course takes place from 23 until 24 September 2010 on the
campus of the K.U.Leuven, Celestijnenlaan 300B, B-3001 Leuven,
Belgium. The course language is English.
Programme
The ISMA35 course will include following topics.
The program is divided in two days, Thursday from 8.30 until
19.00 and Friday from 8.30 until 17.30.
- Introduction
Overview of modal analysis applications.
- Modal analysis theory
Basic assumptions. Single and multiple degree of freedom systems.
Undamped systems, proportionally and generally viscously damped
systems. Frequency response function approach. Natural frequencies,
damping factors, residues, modal vectors, modal participation
factors, modal mass, modal stiffness, modal scaling.
Demonstrations.
- Digital signal processing
Signal types, Fourier transforms: definition and properties,
related transforms. Sampling and A/D conversion, leakage errors and
windows, aliasing errors and filters. Autocorrelation and
autopower. Crosscorrelation and crosspower. Averaging. Frequency
response function estimation: H1, H2 and Hv, coherence function.
Demonstrations.
- Instrumentation
Excitation systems, excitation hammers. Force transducers, motion
transducers, transducers mounting, calibration. Measurement and
analysis systems. Laser vibrometers.
- Excitation techniques
Signal types: random, sine, pulse. Signal performance and
limitations. Application on linear and non-linear systems. Multiple
input/output testing.
- Demonstration and discussion
Aim of the test, test set-up, suspension, selection of equipment,
mounting of transducers, calibration, excitation set-up, hammer
excitation test, shaker excitation test, frequency response
function measurements.
- Modal parameter estimation
Review and principles, frequency and time domain methods, single
and multiple degree of freedom systems, local and global estimates,
system order estimation tools, stability diagram, some specific
methods: least squares complex exponential, least squares complex
frequency domain, least squares frequency domain. Interpretation of
results. Demonstration.
- Modal model validation
Error sources, non-linearities, modal assurance criterion, mode
overcomplexity, mode colinearity, frequency response function
synthesis.
- Use of modal parameters
Principles and application areas of the use of modal parameters in
trouble shooting, forced response estimation, sensitivity analysis
and structural dynamics modification and assembly.
- Linking analysis and test
Correlation between numerical and experimental models, model
matching, model updating. Using numerical model information for
improved test set-up design.
- In-operation modal analysis techniques and case
studies
Operating mode analysis, output-only modal analysis, running mode
analysis.
- Visit "Vehicle technology and lightweight construction"
Laboratory
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