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524 PATEL ET AL. Fig. 16 Comparison of the PASC controller response during the NACA 0015 airfoil pitch-up (left) and pitch-down (right) experiments. center, and bottom plots, and in Fig. 17, which compares the lift during the 0015 pitch-up experiment using four frequency bins (Fig. 17, left) versus eight 8 bins (Fig. 17, right). Figure 18 compares the effect of 16 bins-8 threshold, 8 bins-4 threshold and 4 bins-4 threshold cases which shows that the controller performance was the same for all except for the 4 bins-4 threshold case. The results from feedback control experiments of the smart plasma slat are shown in Figs. 19–21. Figure 19 present a comparison of a representative pressure signal as a function of during pitch-up (Fig. 19 left) and pitch-down (Fig. 19, right) experiments with plasma off and on. During the pitch up, the PASC controller turns the actuator on at approximately 12 deg (2 deg before stall ) and during the pitch down from 24 deg; first it turns the actuator on instantaneously as it detects a stalled condition and then turns the actuator off at approximately 9 deg when it senses that the flow is attached and control is not required. Figure 20 shows a spectral power distribution plot of the 0015 pitch-down case with the PASC controller enabled. It shows the difference in amplitude levels over a wide frequency spectrum as the 0015 undergoes a pitch-down motion from 24 to 0 deg with the actuator commanded off around 9 deg. It was noticed that the angles of attack at which the PASC controller turns the actuator on during pitch up and off during pitch down are different. This was due to the hysteresis in the actuator-induced flow. As some hysteresis in the pressure data was observed during pitching experiments, additional experiments were conducted to investigate the effects of the smart plasma slat on thePDF Image | Autonomous Sensing and Control of Wing Stall Using a Smart Plasma Slat
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