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Device for sampling data for fatigue analysis by rainflow method

  • US 5,847,668 A
  • Filed: 01/30/1997
  • Issued: 12/08/1998
  • Est. Priority Date: 03/28/1996
  • Status: Expired due to Term
First Claim
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1. A device for sampling data for fatigue analysis by the Rainflow Method, comprising:

  • means for A/D converting at predetermined intervals a strain signal from a strain detecting means attached to an object for analyzing fatigue;

    means for sampling a peak of the A/D-converted strain signal and detecting a peak value thereof;

    means for sampling a valley of the A/D-converted strain signal and detecting a valley value thereof;

    means for calculating a difference peak value and the valley value;

    means for counting the difference as a count value representing a frequency of occurrences of any one of a predetermined plurality of levels in accordance with an amount of the difference;

    a memory card detachably provided to a main body of the device for sampling data including at least the means for A/D converting the strain signal, the means for detecting the peak value of the strain signal, the means for detecting the valley value of the strain signal, the means for calculating the difference between the peak value and the valley value and the means for counting the difference; and

    means for writing said count value of the difference at each of the plurality of levels on the memory card.

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