Vibratory Expertise - Extra Semester

5-year combined undergraduate / graduate Engineering programs

General Data
Academic program	General Engineering Program			:
Type d'EC	Classes
Lectures : 14h00 Lab Work : 12h00 Total duration : 34h00	Status :	Period : Extra Semester	Education language : French

Learning Outcomes
- know the procedure to follow to characterize the vibratory behavior of a system and know how to use the means of calculation and measurements necessary for the analytical and experimental approaches, - to know the methodology to follow and the technical solutions available, to reduce abnormally high vibration levels, - know and know how to choose vibration monitoring indicators that can detect the appearance of defects on rotating machines, as well as diagnostic tools that identify the nature of these defects by seeking their signatures in the measurement results, this in order to be able to face all the industrial problems whose vibrations are the cause.

Learning Outcomes

- know the procedure to follow to characterize the vibratory behavior of a system and know how to use the means of calculation and measurements necessary for the analytical and experimental approaches,
- to know the methodology to follow and the technical solutions available, to reduce abnormally high vibration levels,
- know and know how to choose vibration monitoring indicators that can detect the appearance of defects on rotating machines, as well as diagnostic tools that identify the nature of these defects by seeking their signatures in the measurement results,
this in order to be able to face all the industrial problems whose vibrations are the cause.

Content
The chapters of the course, grouped according to the general objectives, are as follows: Characterization of the vibrations of a system: - analytical study: finite element calculation. - experimental study: means of measurement and software for experimental modal analysis. Vibration reduction methodology: - actions on the source of the vibrations, - actions on the transmission of vibrations, - actions on the system's own response. Conditional and provisional maintenance of rotating machinery: - types of defects in rotating machinery, - choice and limitations of monitoring indicators and diagnostic tools. These chapters are complemented by the presentation of frequency analysis tools: Fourier series and digital Fourier transform, used in the experimental characterization of systems and diagnosis of defects in rotating machines. The theoretical knowledge on the characterization of the vibrations of a system is implemented during three sessions of practical work, relating respectively to the use: - means of measurement, - a modal analysis software, - finite element calculations software.

Content

The chapters of the course, grouped according to the general objectives, are as follows:

Characterization of the vibrations of a system:
- analytical study: finite element calculation.
- experimental study: means of measurement and software for experimental modal analysis.

Vibration reduction methodology:
- actions on the source of the vibrations,
- actions on the transmission of vibrations,
- actions on the system's own response.

Conditional and provisional maintenance of rotating machinery:
- types of defects in rotating machinery,
- choice and limitations of monitoring indicators and diagnostic tools.

These chapters are complemented by the presentation of frequency analysis tools: Fourier series and digital Fourier transform, used in the experimental characterization of systems and diagnosis of defects in rotating machines.

The theoretical knowledge on the characterization of the vibrations of a system is implemented during three sessions of practical work, relating respectively to the use:
- means of measurement,
- a modal analysis software,
- finite element calculations software.

Pre-requisites / co-requisites
UE Dynamics of structures (ECAM4, S7, S8)

Bibliography
Serge VIALA - Class handouts on the ECAM intranet. D.J.Ewins - Modal Testing : Theory and Practice - Research Studies Press - 1984. Alain Boulenger, Christian Pachaud - Analyse vibratoire en maintenance - Surveillance et diagnostic des machines - Editions DUNOD

Assessment(s)
N°	Nature	Coefficient	Observable objectives
1	Evaluate students' knowledge of the points that have been dealt with in class and the means of measurement that have been used in the practical work, as well as their ability to interpret results of calculations and measurements. Maximum duration: 2 hours Form: Exercises with answers in one box and MCQ.	1	Ability to understand the theoretical concepts on which vibration studies are based, whether using software or measurement tools
2	Check the ability of students to apply their theoretical knowledge, in order to use measuring devices, as well as software for processing measurements and calculations. Use of finite element calculation software and ECAM applications written in VBA.	0,5	Ability to understand how to properly use calculation or measurement tools.