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Improving the Reproducibility and Control Accuracy of TMF Experiments with High Temperature Transients Pages: 15 Published: Jan 2003
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View License Agreement Source: STP1428-EB Abstract Three different approaches to minimize control deviations in the case of TMF experiments with high temperature transients (10K/s and higher) will be presented. In the first approach, an empirically derived algorithm is used to calculate a modified temperature command function based on the recorded control deviations. In a second approach, a two-zone model of the plant (specimen, grips, heating and cooling device) is used for control design. The model is first used to design a “soft” PI controller for generating a robust starting output profile. This output profile is then used as a basic reference input profile. The remaining error is minimizes by a “fast” PI controller. A third controller approach is characterized by the determination of an inverse model that is used to define an “ideal” profile of the command variable. This “ideal” profile is then used as a reference input profile. Keywords: thermomechanical fatigue, temperature control, control design, inverse control, TMF Paper ID: STP11441S Committee/Subcommittee: E08.03 DOI: 10.1520/STP11441S ASTM International is a member of CrossRef. | ||