Real-Time Frequency Response Estimation Using Joined-Wing SensorCraft Aeroelastic Wind-Tunnel Data

A new method is presented for estimating frequency responses and their uncertainties from wind-tunnel data in real time. The method uses orthogonal phase-optimized multisine excitation inputs and a recursive Fourier transform with a least-squares estimator. The method was rst demonstrated with an F-16 nonlinear ight simulation and results showed that accurate frequency responses of the short period mode were obtained within 10 seconds. The method was then applied to wind-tunnel data from a previous aeroelastic test of the Joined-Wing SensorCraft. Frequency responses describing bending strains from simultaneous control surface excitations were estimated in a time-ecient manner.