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Calculate width of XY graph (hysteresis)

I need to compute the width of a hysteresis plot and am wondering if there are built ins or a combination of them that can do this computation directly from the waveform data.

 

I have a electrohydraulic servovalve controlled linear actuator that I am commanding over it's stroke length.  The input (X) is the commanded position and my output is the outer loop error (Y).  As the actuator moves over it's stroke the error will be different depending on whether I am extending the actuator or retracting it.

 

So my waveform data should have 2 measurements for every point along the stroke and I need to calculate this difference.

 

Most of the ideas I have for doing this computation seem like kludges. I know I can get it done by hand with a "brute force" parsing and processing of the data but was hoping there were some more elegant ways to do it.

 

Ideas?

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Hi SmokeMonster,

 

If I was in your shoes, I would take the equations generated by using on the fitting functions and use that instead. This would work very well with a function global. 

Joe Daily
National Instruments
Applications Engineer

may the G be with you ....
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