Improving the reproducibility and control accuracy of TMF experiments with high temperature transients

in American Society for Testing and Materials (ASTM), in Thermomechanical Fatigue Behavior of Materials, vol. 4, no. ASTM STP 1428, ASTM International, West Conshohocken, PA, 2002
Author(s):Brendel T., Naderhirn M., del Re L., Schwaminger C.
Different approaches will be presented to minimize control deviations in the case of TMF experiments with high temperature transients (10K/s and higher). An empirically derived algorithm calculates a modified function of the temperature command variable on the basis of the recorded control deviations. In a second approach, a two-zone model of the plant is used for control design. The model is first used to design a “soft” PI controller for generating a robust starting output profile, which is used as a basic input reference profile. The remaining error is minimizes by a “fast” PI controller. A third controller approach is realized by determination of an inverse model and its use to determine an “ideal” profile of the command variable as a reference input profile.
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