Adaptive Control of the Atmospheric Plasma Spray Process for Functionally Graded Thermal Barrier Coatings

Figure 2

Block diagrams of three MR-MRACs used in an APSP for producing FGCs. The MPSs ( of powder particles in the observation window are input to MR-MRAC-1 that adjusts flow rates of the argon and the hydrogen and the current, . The averaged – location, of powder particles measured in the observation window is an input to the MR-MRAC-(j+1) that adjusts the average injection velocity and the – location of the injector (j = 1 for NiCrAlY and j = 2 for ZrO₂ particles).