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

Lecturers

Prof. W. Heylen, Prof. P. Sas, Prof. D. Vandepitte, K.U.Leuven
Dr.ir. H. Van der Auweraer, dr.ir. F. Lembregts, dr.ir. S. Dutré, LMS International

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.

Click here to register. At the end of the registration, you will be lead to a secured online payment server, where you can pay by creditcard (Visa or Mastercard).

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.

Accomodation

A limited number of rooms is available at the following hotels. Please arrange hotel reservations yourself before 1 August 2010.

Visa

If you doubt whether you need a visa, you can check it here. If you are from a European Country included in the Schengen Visa only your national identity card or your passport is needed. The Schengen countries are: Austria, Belgium, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden and Switzerland.
There are countries that don't require a visa if the person will stay less than 3 months.
If required, it is recommended that you apply for a visa as soon as possible (approximately 2 months before the conference starts). We can provide the invitation letter as long as you have already registered and paid. Please note that this letter does not guarantee that you receive a visa.

Useful hints for participants

Registration starts at 8.30 a.m. on Thursday 23 September, 2010, at:
K.U.Leuven, PMA,
Celestijnenlaan 300 B
B-3001 Heverlee

Look for the signs ISMA/ISAAC/MDCM Registration. Make sure you take the entrance next to the O&J. Peters Lab (this is in the middle of the parking lot)
Parking space is available.

How to get to PMA?

A route description can be found here.
When travelling from the airport, please make sure you take an official taxi at the taxi rank.
When travelling by train make sure your take direction LEUVEN NOT Louvain-la-Neuve!

Weather

September is late summer in Belgium, with the daily temperatures ranging from 15°C to 20°C, although occasionally the maximum may reach 25°C. On average, the weather is sunny with a few days of rain during the month. An umbrella and a light raincoat are advisable.

Electricity

The electric power is 220 V AC, 50Hz.

Opening hours banks and stores

Banks are generally open from 09.00 a.m. till 3.30 p.m., department stores from 09.30 a.m. till 6.00 p.m., while most other shops stay open from 09.00 a.m. till 07.00 p.m. Mid-day, most shops generally remain open, although you may find a few closed from 12.00 till 02.00 p.m. On Fridays, supermarkets and department stores are generally open until 08.00 p.m.
Money changing after banking hours is available at airports.

Credit cards

Shops and restaurants usually accept major international credit cards such as EuroCard-MasterCard, Visa, American Express, Diners Club, etc., with a preference to EuroCard-MasterCard and Visa.

Programme

The programme is divided in two days, Thursday from 8.30 until 21.00 and Friday from 8.30 until 17.30.

Day 1 : Thursday, 23 September, 2010

• 8h30 : Registration
  
  
• 9h00 - 9h30 : Introduction
  Overview of modal analysis applications.
  W. Heylen, K.U. Leuven, Belgium
  
  
• 9h30 - 10h15 : Modal analysis theory (1)
  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.
  W. Heylen, D. Vandepitte , K.U. Leuven, Belgium
  
  
• 10h15 - 10h35 : Coffee break
  
  
• 10h35 - 12h00 : Modal analysis theory (2)
  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.
  W. Heylen, D. Vandepitte , K.U. Leuven, Belgium
  
  
• 12h00 - 13h30 : Lunch
  
  
• 13h30 - 15h15 : 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.
  P. Sas, K.U. Leuven, Belgium
  
  
• 15h15 -16h00 : Instrumentation
  Excitation systems, excitation hammers. Force transducers, motion transducers, transducers mounting, calibration. Measurement and analysis systems. Laser vibrometers.
  W. Heylen, K.U. Leuven, Belgium
  
  
• 16h00 -19h30 : Ground Vibration Test on F16
  Full scale modal testing and analysis on an F16 aircraft, at campus Saffraanberg of the Belgian Royal Military School.
  B. Lenaerts, LMS International, Belgium
  
  
• 19h30 - 20h30 : Sandwich dinner at LMS HQ
  
  
• 20h30 - 21h00 : Transport to Leuven
  
  

Day 2 : Friday, 24 September, 2010

• 8h30 - 9h15 : Excitation techniques
  Signal types : random, sine, pulse. Signal performance and limitations. Application on linear and non-linear systems. Multiple input/output testing.
  W. Heylen, K.U. Leuven, Belgium
  
  
• 9h15 - 10h15 : Modal parameter estimation (1)
  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 (single and polyreference), least squares complex frequency, least squares frequency domain. Interpretation of results. Demonstration.
  F. Lembregts, LMS International, Belgium
  
  
• 10h15 - 10h35 : Coffee break
  
  
• 10h35 - 11h20 : Modal parameter estimation (2)
  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 (single and polyreference), least squares complex frequency, least squares frequency domain. Interpretation of results. Demonstration.
  F. Lembregts, LMS International, Belgium
  
  
• 11h20 - 12h00 : Modal model validation
  Error sources, non-linearities, modal assurance criterion, mode overcomplexity, mode colinearity, frequency response function synthesis.
  P. Sas, K.U. Leuven, Belgium
  
  
• 12h00 - 13h30 : Lunch
  
  
• 13h30 - 14h00 : Visit "Vehicle technology and lightweight construction" Laboratory
  F. De Coninck, K.U. Leuven, Belgium
  
  
• 14h00 - 14h45 : In-operation modal analysis techniques and case studies
  Operating mode analysis, output-only modal analysis, running mode analysis.
  B. Peeters, LMS International, Belgium
  
  
• 14h45 - 15h30 : 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.
  W. Heylen, K.U. Leuven, Belgium
  
  
• 15h30 - 15h50 : Coffee break
  
  
• 15h50 - 16h35 : Linking analysis and test
  Correlation between numerical and experimental models, model matching, model updating. Using numerical model information for improved test set-up design.
  W. Heylen, K.U. Leuven, Belgium
  
  
• 16h35 - 17h30 : Case study
  D. Moens, K.U. Leuven, Belgium