Real-Time Drag Optimization and Maneuver Load Alleviation Control for a High Aspect Ratio Wing Wind Tunnel Model

Abstract

This paper presents real-time drag optimization and maneuver loading alleviation study of the aspect ratio 13.5 Common Research Model (CRM) wind-tunnel model with a distributed mini-plain flap system. A surrogate aerodynamic model of the aspect ratio 13.5 CRM is developed based on an aerodynamic database computed by an in-house developed tool based on VSPAERO to capture the aerodynamic coefficients as functions of the angle of attack, flap deflections, and Mach number. A vortex-lattice model of the CRM is developed with transonic small disturbance and integral boundary-layer corrections coupled with a NASTRAN equivalent beam model for the rapid CRM aeroelastic simulation. A recursive least-squares parameter estimation algorithm is designed to estimate the aerodynamic parameters of the surrogate model. The estimated surrogate model is then used in an on-line drag optimization and maneuver loading alleviation strategy based on an adjoint method. The results of the real-time drag optimization indicate a drag reduction of 6.09% for Mach 0.85, q=230 psf and ���� = 0.5. The results of the maneuver loading alleviation strategy indicate a wing root bending moment reduction 12.70% for Mach 0.85, q=230 psf and ���� = 0.5.