337-0507/01 – Experimental Modal Analysis (EMA)
| Gurantor department | Department of Mechanics | Credits | 4 |
| Subject guarantor | Mgr.Ing. Alena Bilošová, Ph.D. | Subject version guarantor | Mgr.Ing. Alena Bilošová, Ph.D. |
| Study level | undergraduate or graduate | Requirement | Choice-compulsory |
| Year | 1 | Semester | summer |
| | Study language | Czech |
| Year of introduction | 2004/2005 | Year of cancellation | 2014/2015 |
| Intended for the faculties | FS | Intended for study types | Follow-up Master |
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
Experimental work in labs
Project work
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. EWINS, D.J.: Modal Testing: Theory, Practice and Application, second
edition, Research Studies Press, Ltd., England 2000
Recommended literature:
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.
E-learning
Other requirements
none none none none none
Prerequisities
Subject has no prerequisities.
Co-requisities
Subject has no co-requisities.
Subject syllabus:
Modal test, its purpose and way of performing, basic concepts.
Dual channel analysis, definition of basic functions, coherence function.
Mobility measurement methods, basic measurement set-up.
Analyzers, digital signal processing.
Excitation methods.
Introduction to experimental modal analysis theory. One degree-of-freedom system, description and properties of 1 DOF frequency response function.
Undamped multi degree-of-freedom system, orthogonal properties and modal shapes scaling.
Damped multi degree-of-freedom system, types of damping.
Methods of extracting modal parameters.
Creating mathematical models of a structure (response, modal and spatial models).
Methods of comparing theoretical (FEM) model and experimentally derived model, modal assurance criterion, mass and stiffness error matrices.
Structural modifications.
Operational deflection shapes. Application of experimental modal analysis in technical diagnostics,
Operational modal analysis, multiple-input multiple-output analysis.
Conditions for subject completion
Occurrence in study plans
Occurrence in special blocks
Assessment of instruction
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