Multisine Inputs for Simultaneous Identification of Multiple Control Loops

摘要

A method for the estimation of simultaneous frequency responses in a linear dynamic model of a tail sitter aircraft was developed and studied. Bare airframe, broken-loop, closed-loop, and disturbance rejection inputs were analyzed. Frequency domain results are presented using automated orthogonal phase-optimized multisine inputs. Results show that individual as well as simultaneous injections provided accurate results for flight control system testing and validation. The use of orthogonal phase-optimized multisine inputs were shown to be most advantageous in high feedback, effector redundant, flight control systems typical of unstable aircraft. The use of such flight test techniques will amount to significant time and cost savings compared to the existing state of the art.