General Engineering Program
| General Data | ||||
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| Academic program | General Engineering Program | :
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| Type d'EC | Classes (LIIAem08SappEExpVib) | |||
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Status :
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Period :
Extra Semester |
Education language :
French |
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| Learning Outcomes |
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| - set up finite element calculation software to determine the vibration properties of a mechanical system (eigenmodes, frequency responses) - define the conditions under which a frequency response measurement must be performed (equipment, measurement points, frequency analysis parameters) - extract the modal characteristics of a mechanical system from its frequency response curves in the case of weak modal coupling - describe the solutions used to reduce unwanted vibrations of a mechanical system - explain the condition-based maintenance procedure based on measuring the vibrations of a rotating machine - list the mechanical defaults that a rotating machine may present and the symptoms which indicate the appearance of these defaults. |
| Content |
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| 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 |
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| UE Dynamics of structures (ECAM4, S7, S8) |
| Bibliography |
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| 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) | |||
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| N° | Nature | Coefficient | Observable objectives |
| 1 | Maximum duration: 2 hours Exercises with answers in one box and MCQ. | 1 | All the learning outcomes |
| 2 | Use of finite element calculation software and ECAM applications written in VBA. | 0,5 | - determine the vibratory properties of a mechanical system (eigen modes, frequency responses) using finite element calculation software - define the conditions under which a frequency response measurement must be performed (equipment, measurement points, frequency analysis parameters) - extract the modal characteristics of a mechanical system from its frequency response curves in the case of weak modal coupling |