2018 SoundWeld

Acoustic monitoring is an important part of the monitoring of industrial processes, especially for the adjustment of process parameters and the determination of the maintenance requirements of a machine or plant. In this context, sound emission takes place via structure-borne or airborne sound [38] and can be analyzed after measuring these quantities in the frequency spectrum. The spectrum is calculated using the fast Fourier transform (FFT) method. The frequencies to be recorded are in the audible sound range (20Hz - 20kHz) or ultrasound 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 body and airborne sound sensors (e.g. piezoelectric accelerometers, microphones). The vibration behavior determined in this process exhibits a time and frequency pattern characteristic of the system, which, after comparison with stored standard curves based on the known behavior of fault-free systems, enables a statement to be made about the quality of the machining process. A time-continuous evaluation of this process is realized via the acoustic process monitoring of the application. This control runs simultaneously to the machining process and allows the direct detection of occurring errors by evaluating the measured body and airborne sound signals during the process.

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