330-0535/02 – Experimental Modal Analysis (EMA)

Gurantor departmentDepartment of Applied MechanicsCredits4
Subject guarantordoc. Ing. Michal Šofer, Ph.D.Subject version guarantordoc. Ing. Michal Šofer, Ph.D.
Study levelundergraduate or graduateRequirementCompulsory
Year1Semesterwinter
Study languageEnglish
Year of introduction2021/2022Year of cancellation
Intended for the facultiesFSIntended for study typesFollow-up Master
Instruction secured by
LoginNameTuitorTeacher giving lectures
FOJ08 doc. Ing. František Fojtík, Ph.D.
SOF007 doc. Ing. Michal Šofer, Ph.D.
Extent of instruction for forms of study
Form of studyWay of compl.Extent
Full-time Credit and Examination 2+2

Subject aims expressed by acquired skills and competences

Students will master problematics of modal tests both theoretically and practically. They will be able recognize in their future engineering practise, when it is appropriate to utilize results obtained by modal test as a part of solving the current problem and they will be able to gain these results. They will be able to use data from experiment for finite element models updating, which significantly increases validity of computational methods.

Teaching methods

Lectures
Tutorials
Experimental work in labs

Summary

The module deals with the identification of dynamical properties of mechanical structures using experimental modal analysis method. Student will become acquaintant with instrumentation and software used in modal testing, with preparation of a modal test, with methods of frequency response functions measurement and with methods of extracting modal parameters from the measured data. They will also learn, how to use the experimentally derived modal parameters for computational models updating.

Compulsory literature:

[1] BILOŠOVÁ, A.: Modal Testing. Dostupný z https://edison.sso.vsb.cz/cz.vsb.edison.edu.study.prepare.web/StudySupportsFileServlet/741add29-8922-4f2c-9ce4-563c2f19dc18;1.1/EMA_skriptaEN.pdf?inline=true [2] EWINS, D.J.: Modal Testing: Theory, Practice and Application, second edition, Research Studies Press, Ltd., England 2000

Recommended literature:

[1] ZAVERI, K. Modal Analysis of Large Structures - Multiple Exciter Systems, Denmark 1985, ISBN 87 87355 03 5

Way of continuous check of knowledge in the course of semester

Student will prove his/her knowledge by independently operating measurement equipment and software for modal analysis and by his/her ability to perform modal test of a machine part by him/herself. The course ends with a combined exam.

E-learning

Other requirements

Project elaboration of given topic.

Prerequisities

Subject has no prerequisities.

Co-requisities

Subject has no co-requisities.

Subject syllabus:

1. Modal test, its purpose and way of performing, basic concepts. 2. Dual channel analysis, definition of basic functions, coherence function. 3. Mobility measurement methods, basic measurement set-up. 4. Analyzers, digital signal processing. 5. Excitation methods. 6. Introduction to experimental modal analysis theory. One degree-of-freedom system, description and properties of 1 DOF frequency response function. 7. Undamped multi degree-of-freedom system, orthogonal properties and modal shapes scaling. 8. Damped multi degree-of-freedom system, types of damping. 9. Methods of extracting modal parameters. 10. Creating mathematical models of a structure (response, modal and spatial models). 11. Methods of comparing theoretical (FEM) model and experimentally derived model, modal assurance criterion, mass and stiffness error matrices. 12. Structural modifications. 13. Operational deflection shapes. Application of experimental modal analysis in technical diagnostics. 14. Operational modal analysis, multiple-input multiple-output analysis.

Conditions for subject completion

Full-time form (validity from: 2021/2022 Winter semester)
Task nameType of taskMax. number of points
(act. for subtasks)
Min. number of points
Credit and Examination Credit and Examination 100 (100) 51
        Credit Credit 35  20
        Examination Examination 65  25
Mandatory attendence parzicipation: Zápočet a zkouška.

Show history

Occurrence in study plans

Academic yearProgrammeField of studySpec.ZaměřeníFormStudy language Tut. centreYearWSType of duty
2027/2028 (N0715A270034) Applied Mechanics NEM P English Ostrava 1 Compulsory study plan
2026/2027 (N0715A270034) Applied Mechanics NEM P English Ostrava 1 Compulsory study plan
2025/2026 (N0715A270034) Applied Mechanics NEM P English Ostrava 1 Compulsory study plan
2024/2025 (N0715A270034) Applied Mechanics NEM P English Ostrava 1 Compulsory study plan
2023/2024 (N0715A270034) Applied Mechanics NEM P English Ostrava 1 Compulsory study plan
2023/2024 (N0715A270033) Applied Mechanics NEM P Czech Ostrava 1 Compulsory study plan
2022/2023 (N0715A270034) Applied Mechanics NEM P English Ostrava 1 Compulsory study plan
2022/2023 (N0715A270033) Applied Mechanics NEM P Czech Ostrava 1 Compulsory study plan
2021/2022 (N0715A270034) Applied Mechanics NEM P English Ostrava 1 Compulsory study plan
2021/2022 (N0715A270033) Applied Mechanics NEM P Czech Ostrava 1 Compulsory study plan
2020/2021 (N0715A270033) Applied Mechanics NEM P Czech Ostrava 1 Compulsory study plan

Occurrence in special blocks

Block nameAcademic yearForm of studyStudy language YearWSType of blockBlock owner