The calculations show that the instantaneous frequency of the rolling elements amounted to 18.3 Hz. Figure 4: comparison of noise emission and vibration signals of the damaged bearing of the bearing seating was installed in vertical position of the axle according to an acceleration sensor. In addition to this sensor, the vibration test system consisted of a vibration device for DSA. The vibration data is imported to the analysis in a MATLAB environment. At constant rotational speed, the accelerometer against an acoustic sensor was replaced. The test system described here to the Sound emissions test was used for data collection.
The data analysis was carried out using the MATLAB environment. Figure 4 shows the results of the comparison between the signal from the noise and the vibration acceleration signal. As the figure shows, the signal / noise ratio of the noise which is caused by the surface damage of the rolling body is much higher than the signal / noise ratio of vibration acceleration. Figure 5 shows an envelope spectrum of the two signals to narrow-band filtering. As can be seen from the figure, the envelope spectrum of acoustic emission signal has a simpler line structure, from which the characteristic frequency of damage is easier to determine. Figure 5: Comparison of the envelope spectra of sound emission signal and the signal of a damaged bearing vibration acceleration test system for acoustic emission testing combines the outstanding price-performance ratio of the digitizer PCI-9846 and the ease of use through the software. Thereby resulting low costs, a comfortable development environment and a large potential for expansion. The test system was used to evaluate the sound emission signal that produces a roller bearing with surface damage to the bearing in operation.
The results of this test were compared with the results of a conventional vibration test. The comparison shows that the noise has a larger signal-to noise ratio. This shows the great potential of the acoustic emission test for the early detection and diagnosis of rolling bearing damage. Contact: acceed GmbH Dr. Werner Kunze Arnold road 19 40479 Dusseldorf phone: + 49.