| 摘要 |
The vibrational components over a frequency spectrum of interest developed by a machine are transformed into electrical signals by means of a transducer such as an accelerometer, and these electrical signals in turn are processed by means of a spectrum analyzer to provide a power spectral density plot thereof. The peak amplitude of the signals in a pair of preselected frequency bands is then detected and the ratio between these two signals determined. This ratio is then compared against a value representing an acceptable ratio experimentally or theoretically derived to determine whether the measured ratio is within acceptable tolerances for the machine. The bands utilized are preferably a first band within a high frequency vibrational range, and a second band lower in frequency than this first band with the signals in these bands being of medium amplitude relative to all of the signals developed in the spectral analysis.
|
