Vibration behavior of mechanical systems

Predicting the vibratory behavior of mechanical systems is fundamental, yet this skill is not given the place it deserves in engineering training. In fact, a poor assessment of vibration levels can result in :

• poorly estimated displacement amplitudes, and hence deformations and stresses, which accentuate the phenomenon of deterioration of parts through fatigue and subsequent cracking;

• a discomfort we have all experienced in certain means of transport;

• the fact that a room will resonate and that a noise disturbance will immediately appear.

Of course, many of our engines (internal combustion, gas turbines, etc.) operate periodically, and are a source of excitation for the systems.

The purpose of the various articles that follow in this volume is to recall the elements that make it possible to :

• predicting behavior and tracking position changes over time;

• effectively combat unwanted movement by means of vibration isolation.