| 摘要 |
<p>A method for analysing the condition of a machine having a rotating shaft, comprising: generating an analogue electric measurement signal dependent on mechanical vibrations emanating from rotation of said shaft; sampling said analogue measurement signal at a sampling frequency so as to generate a digital measurement data signal in response to said received analogue measurement data; performing a decimation of the digital measurement data signal so as to achieve a digital signal having a reduced sampling frequency; wherein said decimation includes the step of controlling the reduced sampling frequency such that the number of sample values per revolution of the shaft is kept at a substantially constant value; and receiving said digital signal at an enhancer input performing a correlation in said enhancer so as to produce an output signal sequence wherein repetitive signals amplitude components are amplified in relation to stochastic signal components performing a condition analysis function for analysing the condition of the machine dependent on said digital signal having a reducent sampling frequency. co co ooI</p> |
