A generalized PID error governing scheme for SMART/SBLI control

This paper presents the control strategy used in a novel concept termed Smart Mesoflaps for Aeroelastic Recirculation Transpiration (SMART) aimed at controlling shock/boundary-layer interactions (SBLI) in supersonic jet inlets. A basic PID controller used initially effectively meets the performance requirements. However, this sometimes results in actuation saturation, which can be very damaging to the SMART hardware. Therefore, a generalized error governing scheme for PID controllers is developed to compensate for actuator saturations. This method can be generalized to any stable process controlled by a PID, and has advantages over traditional anti-windup controllers. The PID error governing method is experimentally applied to a benchtop SMART subsystem and is shown to be successful at preventing excessive control efforts.