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System for operational monitoring of a machine

  • US 4,559,828 A
  • Filed: 06/26/1984
  • Issued: 12/24/1985
  • Est. Priority Date: 07/01/1983
  • Status: Expired due to Fees
First Claim
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1. In a system adapted for monitoring the condition of a machine by vibration analysis, and wherein the machine has a characteristic frequency spectrum when operating normally, said system including at least one vibration sensor in operative contact with said machine for sensing machine vibrations, and providing a vibration signal at its output, sampling means connected to the output of said vibration sensor, said sampling means including an amplifier, a low pass filter postcoupled to said amplifier, and an A/D converter postcoupled to said filter for sampling, amplifying and digitizing the signal obtained from said vibration sensor, separate frequency analysis means arranged to receive the sampled and digitized signal from said sampling means for frequency analysis thereof, and pattern recognition means coupled to said frequency analysis means for detection of any abnormal frequency spectra corresponding to abnormal machine operation, the improvement comprisinglocal data processing means near said machine adapted to store programs for the control thereof, being connected to said vibration sensor, and including a microcomputer inclusive of a random access memory, being arranged for obtaining vibration data from said sensor, and for storing said vibration data in the form of a time series in said memory, said local data processing means also including said sampling means,central monitoring means remote from said local data processing means adapted to store another program therein, and providing for monitoring and further processing of said time series, said central monitoring means including computer means, as well as said frequency analysis means, and said pattern recognition means, said computer means being connected to said frequency analysis means,control means connected to said central monitoring means, anda two-way communication link connecting said local data processing means and said central monitoring meansfor periodic transmission of said time series from said memory in said microcomputer of said local data processing means in one direction to said frequency analysis means in said central monitoring means, andfor transferring said other program from said central monitoring means back to said local data processing means in a direction opposite to said one direction,said control means providing for control of said amplifier, of said low pass filter, and of said A/D converter, through said communication link,whereby transmission of said time series from said local data processing means to said central monitoring means can be matched to reception conditions prevailing at said central monitoring means.

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