Abstract
A closed-loop feedback scheme for obtaining a goal microstructure during hot isostatic pressing (“hipping”) of powders is described. The control scheme relies on previously developed process models describing the process dynamics during a HIP run and sensors which can measure density and grain size. We use constantly updated linearization and coprime factorization and thus implement the control by convex programming. Simulation results showing the performance of the control scheme are presented.
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Formerly Assistant Professor with the University of Virginia
An increase in temperature or pressure is accomplished by commanding a positive slew; a decrease is accomplished with a negative slew command.
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Meyer, D.G., Wadley, H.N.G. Model-based feedback control of deformation processing with microstructure goals. Metall Trans B 24, 289–300 (1993). https://doi.org/10.1007/BF02659131
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DOI: https://doi.org/10.1007/BF02659131