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Method for collecting machine vibration data

  • US 5,610,339 A
  • Filed: 03/06/1996
  • Issued: 03/11/1997
  • Est. Priority Date: 10/20/1994
  • Status: Expired due to Term
First Claim
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1. A method for predicting and for detecting the condition of a screw compressor having at least one rotative element, the method comprising the following steps:

  • storing in a memory a predetermined logic routine and at least one predetermined key frequency value of the at least one rotative element of the compressor;

    trending, at regular intervals, to determine whether the compressor vibratory condition has changed, said trending comprised of the following steps;

    operating the compressor in a predetermined operational state;

    sensing the mechanical motion of the at least one rotative element during compressor operation;

    converting the mechanical motion of the at least one rotative element into a corresponding electrical signal;

    correlating the predetermined operational state of the screw compressor with the corresponding electrical signal;

    inputting the corresponding electrical signal to a processor;

    processing the corresponding electrical signal into corresponding vibration data of the compressor by utilizing the predetermined logic routine; and

    analyzing the corresponding vibration data for trends with the at least one predetermined key frequency value of the at least one rotative element of the compressor and comparing the vibration data with any previously collected vibration data to determine the present condition and predict the future condition of the compressor;

    decreasing the length of the regular interval between trending steps if the compressor experiences a negative deviation in the vibratory condition; and

    controlling the operation of the compressor in response to the determined present condition and predict the future condition of the compressor by sending a command signal from the processor to the compressor.

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