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As well as harmonic analysis by means of Fourier transformation, counting procedures have proved to be an important tool for examining signals, in particular for load-time functions. Counting is based on a search for specific events in the load-time function, e.g. a certain load level being exceeded or a load alternation of a certain amplitude. For this purpose, the range of values of the load-time function is divided into discrete intervals, or classes. Each event found is assigned to a class and counted in this class.
FlexPro's Counting Procedures option provides you with a broad spectrum of counting procedures. It includes counting procedures according to the DIN 45667 standard and the more modern Rainflow counting method. The DIN 45667 standard dates from 1969 and is oriented towards the technical counting devices that were available at that time. The Rainflow procedure has mostly replaced DIN 45667 and provides far better results for applications such as fatigue testing. The Counting Procedures option includes DIN 45667 procedures for instances where the Rainflow procedure does not offer an equivalent solution.
Features
- Matrices: Markov matrix and Rainflow matrix in range-mean format as well as symmetrical and asymmetrical from-to format. The residue of the rainflow count can optionally be included into the result.
- Range filter: To suppress small load changes.
- Class divisions: Automatic, start and width of class, begin and end, symmetrical or via external data set.
- Derived collectives: Peaks and troughs, positive and negative ranges and range pairs, positive and negative level crossings.
- Frequencies: Absolute, relative, percentage and cumulative.
- Counting procedures according to DIN 45667: Sampling, maximum value and time-at-level.
- Compound counting procedures according to DIN 45667: Sampling, maximum value and dwell time-at-level from two input data sets with separate class division for each data set.
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