Informations du cours

Vibrations and shocks are ubiquitous in everyday life. They may often have undesirable effects such as noise disturbances or may even cause the ruin of a structure. The last three decades have thus witnessed a tremendous interest in a better understanding of the structural dynamic behaviour. In a nutshell, we could say that modal analysis is a process whereby we describe a structure in terms of its natural characteristics which are the frequency, damping and mode shapes. It is dynamic properties, identified by different ways (theoretical, numerical, experimental), which have become a major concern of structural dynamicists. This field of research is referred to as modal analysis in the technical literature and relies on two important assumptions: linearity and time invariance of the structure. The knowledge of the modal parameters can serve various purposes including structural modification, assessment of the structural integrity and reliability, structural health monitoring and model updating. In addition, design for vibration and control of vibration are crucial in maintaining a high performance level and production efficiency, and prolonging the useful life of machinery, structures, and industrial processes. Before designing or controlling an engineering system for good vibratory performance, it is important to understand, represent (i.e., model), and analyse the vibratory characteristics of the system.

This course covers a large field of knowledge, including sensors and excitators, measurement techniques, vibration signal processing, dynamic models and modal concept, experimental modal analysis, applications of modal analysis, vibration isolation, dynamic vibration absorbers and auxiliary mass dampers. A last part is devoted to techniques that will allow successful analysis, design, modification, testing, and control of vibration and shock in engineering systems. A special focus is also paid on human response to vibration, by presenting useful and practical information.