2018 SoundWeld

Acoustic monitoring is an important part of monitoring industrial processes, particularly when setting process parameters and determining the maintenance requirements of a machine or system. The sound emission takes place via structure-borne or airborne sound [38] and can be analyzed after measuring these variables in the frequency spectrum. The spectrum is calculated using the fast Fourier transformation (FFT) method. The frequencies to be recorded are in the audible sound range (20Hz - 20kHz) or ultrasonic range (>= 20kHz). A holistic system consisting of machines and workpieces is always considered. If this system is excited by a vibration on the input side, a characteristic system response is generated on the output side, which can be recorded acoustically with the aid of structure-borne and airborne sound sensors (e.g. piezoelectric accelerometers, microphones). The determined vibration behavior shows a characteristic time and frequency pattern for the system, which, after comparison with stored standard curves based on the known behavior of error-free systems, enables a statement to be made about the quality of the machining process. A time-continuous assessment of this process is realized via the acoustic process monitoring of the application. This monitoring runs simultaneously with the machining process and allows errors to be detected directly by evaluating the measured structure-borne and airborne sound signals during the process.

Responsible for the project: Dr. Hubertus Siebald and Dipl.Ing. H.H. Kaufmann