DEVICE AND METHOD FOR THE EARLY RECOGNITION AND PREDICTION OF UNIT DAMAGE

摘要

The invention relates to a device and a method for the early recognition and prediction of unit damage in machine plants, in particular mobile machine plants. The structural noise of the machine plant is thus recorded by a sensor (1), transmitted as an acceleration signal and analysed in a digital signal processor (DSP). In order to inhibit negative influences from environmental vibrations or structural sound waves which are nothing to do with the status of the machine plant, the acceleration signal is firstly transformed into the frequency domain by means of a fast Fourier transformation and the data thus obtained is then transformed back into the time domain by means of a cepstrum analysis, such that resonance data from single shock impulses (a cepstrum) are obtained in the time domain. Said cepstrum is then compared with a comparative cepstrum, available in a memory unit corresponding to load and speed signals for the current operating status for a new machine plant. On exceeding threshold values the diagnostic signal, in particular information about the unit diagnosed as being damaged and the predicted remaining service life thereof is displayed for the user and an emergency operation initiated.