Device for sampling data for fatigue analysis by rainflow method

Details Device for sampling data for fatigue analysis by rainflow method Device for sampling data for fatigue analysis by rainflow method

1997-01-30

1998-12-08

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Detecting analog signal peak

364508, G06F 530

Patent

active

058476687

ABSTRACT:
To more accurately and more simply realize data collection and analysis for analyzing fatigue phenomenon of materials by the Rainflow Method, strain signals from a strain detecting means attached to an object for analyzing fatigue is A/D-converted at predetermined intervals, a peak of the A/D-converted strain signal is sampled, the peak value is detected, a valley is sampled, the valley value is detected, the difference between the peak value and the valley value is calculated, count values for respective levels are calculated in accordance with the magnitudes of the differences and the count values at the respective levels are written to a memory card detachably provided to the main body of the device of sampling data.

REFERENCES:
patent: 5531122 (1996-07-01), Chatham et al.
"In-situ Measurement of Fatigue LIfe by the Rainflow Method", Nikkei Mechanical Oct. 15, 1979, pp. 69-75 with partial English translation.
Tatsuo Endo et al., "Mechanical Behavior of Materials", vol. I, pp. 371-381, The Society of Materials Science, Japan, 1974.
Masao Takahara, Field Data Acquisition System by "Rainflow Method" And fatigue Life estimation of Automobile, pp. 87-93.

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