All programmes > Structural Dynamics, Analysis and Numerical Modelling

Structural Dynamics, Analysis and Numerical Modelling (B-KUL-H04X0A)

6 ECTSEnglish84 First termCannot be taken as part of an examination contract
Gryllias Konstantinos
POC Werktuigkunde

Aims

The student acquires theoretical and practical insight in the process of determining the dynamics of a mechanical system by experiments and/or numerical analysis.
The student is able to determine the dynamic characteristics of simple mechanical structures by executing an experimental modal analysis and building a numerical model. He/she can interprete the results of both approaches and knows the processes to combine them to one result. In this process he/she learns how to use state-of-the-art hardware and software.
The student can report on the flow and results of a small scale dynamic analysis project, including experimental and numerical approaches.
The student is able to carry out a literature survey on subjects related to the experimental or numerical dynamic analysis of mechanical structures.

 

Previous knowledge

The students should have sufficient knowledge of mechanical vibrations, system theory, sensors and measuring systems and numerical modelling. It is the students own responsibility to fill possible gaps in his foreknowledge. Lack of foreknowledge should not disturb the normal flow of the teaching activities.

Is included in these courses of study

Activities

1.88 ects. Structural Dynamics, Analysis and Numerical Modelling: Theory Lecture (B-KUL-H04X0a)

1.88 ECTSEnglishFormat: Lecture14 First term
Gryllias Konstantinos
POC Werktuigkunde

Content

Part 1 : Identification and use of structural dynamic models (Modal testing) 

  • Review of the theory of SDOF and MDOF mechanical vibrations, definition of modal parameters

  • Digital signal processing

  • Identification of FRF matrices

  • Instrumentation

  • Excitation techniques

  • Time and frequency domain parameter identification

  • Accuracy of modal models, model validation techniques

  • Sensitivity analysis

  • Structural modification techniques

  • Correlation experiment – simulation

  • Model updating
     

Part 2 : Finite element models for structural dynamic analysis

  • Modelling considerations

  • Solution methods

  • Model reduction techniques

Course material

Study cost: 11-25 euros (The information about the study costs as stated here gives an indication and only represents the costs for purchasing new materials. There might be some electronic or second-hand copies available as well. You can use LIMO to check whether the textbook is available in the library. Any potential printing costs and optional course material are not included in this price.)

'Modal analysis theory and testing' (W. Heylen, P. Sas, S. Lammens) (published by PMA-KULeuven).
Course notes about finite element techniques for dynamics.
Instruction manuals for the use of hardware and software (TOLEDO)

4.12 ects. Structural Dynamics, Analysis and Numerical Modelling: Workshop (B-KUL-H04Y1a)

4.12 ECTSEnglishFormat: Assignment70 First term
Gryllias Konstantinos
POC Werktuigkunde

Content

4  hands-on seminars:
-  experimental modal analysis set-up and frequency response function measurements
- modale parameter estimation
- numerical dynamic analysis
- model updating

 
Project:
- experimental and numerical modal analysis of a self chosen simple mechanical structure, including model updating
- reporting on the results of the experimental and numerical assessment of the dynamics of a simple mechanical system and on the model updating results.

 
Literature survey:
- synthesis of 3 to 4 journal papers on a given subject, related to experimental and numerical modal analysis
- presentation of this literature survey.

Course material

Specific user manuals for the use of measurement systems and software.

Format: more information

This activity contains:
1. 4 seminars to introduce the students to the techniques and equipment needed to carry out the project
2. the project itself
3. a literature survey

Evaluation

Evaluation: Structural Dynamics, Analysis and Numerical Modelling (B-KUL-H24X0a)

Type : Partial or continuous assessment with (final) exam during the examination period
Description of evaluation : Report, Presentation, Participation during contact hours
Type of questions : Open questions
Learning material : Course material, Reference work

Explanation


The evaluation contains 3 parts:

Permanent evaluation by following up a project. This project consists of an experimental and numerical modal analysis of a mechanical structure, selected by the students (in teams of 2 or 3 students). The students start the project around semester week 7. The student is judged on practical preparation of, knowledge of the practical and theoretical background needed for,and presence and collaboration during the test campaign.
This part counts for 3 of the 20 points. Succeeding for this part is required to succeed for the entire course. It is not possible to retake this part in the framework of a second chance exam.

Written and oral reporting about the project. The deadline of the report is at least 4 working days before the presentation in front of the teaching professors and the coaching assistants. The students fix the moment of presentation in consensus with the teaching professors (up to the end of the examination period). During the oral defense the students will be interrogated about the reasons for made choices during the project, about the interpretation of the results and about the (physical) background and principles of used methods.
This part counts for 15 of the 20 points.

A literature survey about a complementary subject by the same team: This includes a deeper investigation about a subject covered in the course and imposed by the course teachers.
This part counts for 2 of the 20 points. Succeeding for this part is required to succeed for the entire course.
If passed, the score is transferred to the score of a potential second chance exam.

Information about retaking exams

The student can’t redo the practical measurement sessions, hence the student should have passed this as part of the first exam. The student has to write a report as mentioned for the first exam on the basis of existing measurements and information about a structure. Similarly as for the first exam, this report is to be presented to the teaching professors and the coaching assistants. The coaching of this project is subjected to the availability of the coaching assistants.