Patent ID: 6392584
Filing Date: 2002-05-21
Classification: G01H,G01L,G01M,G07C

Abstract:
A system for monitoring the status of a machine comprising:a sensor generating an output signal corresponding to motions of the machine at a monitoring point; an analog-to-digital converter (ADC) converting, at a sampling rate, the output signal of the sensor into a series of samples forming a digital input signal; processing means: for partitioning the digital input signal samples into a plurality of input data sets; for calculating an alarm parameter for each data set; for generating an alarm signal when the alarm parameter of at least one data set meets a predetermined alarm criterion; for adjusting the sampling rate of the ADC as a predetermined function of the input data sets; autorange means for scaling the output signal of the sensor to fall within a predetermined amplitude range of the ADC; and sample control means for automatically adjusting the sampling rate of the ADC so that samples in each data set correspond to samples of the sensor output signal ranging over a full period of a fundamental frequency of the motions of the machine.