Analyse vibratoire expérimentaleMéthodes numériques et expérimentales (GSI)

The study and analysis of vibrations (and their signals) have grown considerably in recent years, due to the development of increasingly sophisticated techniques and the most varied needs in areas such as mechanics (transports, machines, . . . ), acoustics, optics, transmissions, . . . .

Current concerns can be divided into three categories:

• The first, theoretical (or analytical), relates to the dynamic calculation of structures as an extension of the resistance of materials and the Mechanics of continuous media.
• The second concerns extremely valuable, albeit relatively recent, assistance to design offices due to the significant progress of computers placed on the market often associated with high-performance software based on the finite elements, of a non-prohibitive and intuitive cost, making the calculation easy. While in most cases the results are valid, the utmost caution must be exercised when exploiting the results, with some software eroding, for example, intermediate modes. Indeed, in certain circumstances, this strategy of the button press can reserve unpleasant surprises.
• The last is experimental: the measure also requires multiple knowledge and extreme rigour. It is not enough to plug, calibrate and read on a screen! In addition, these experiments should provide a model representative of the actual structure.

Since the field of vibrations has become an extremely wide field and of increasing complexity, the objectives of this teaching are the understanding of phenomena and its implementation through the 12 hours of Courses and 12 hours of Practical Work while being limited to the exploitation of the basic knowledge essential to the conduct of a project from:

• mathematical theories that the student engineer must constantly have in mind;
• basic concepts necessary for the use of devices currently on the market, mainly real-time analysers; While focusing as much as possible on the comparison of the results obtained by the analytical, numerical and experimental approaches by not hesitate to rely initially on simple examples.

Some tips: Do not hesitate to make diagrams and/or photos to illustrate your comments. Remember that curves are there to give information!

Any authorized documents.

At the end of each chapter, the reader interested in a specific subject will find references to the various books and publications used to document this course.