2. Measuring equipment

2.1 Measurements during machining

A priori, at the foot of a machine tool, it is possible to retrieve several types of information likely to reveal the presence of vibrations: noise, accelerations, speeds, positions, forces, torques, power, etc :

• noise (measured, for example, with a simple microphone): this is the easiest signal to obtain, but it is often polluted by the various elements around the machine (multiple mechanical elements of the machine, neighboring machines);

• vibrations (measured, for example, with an accelerometer in contact with a part of the machine or workpiece): this is the most widely used signal for reliable vibration detection. That said, problems of signal saturation by high-frequency...