Alternative Approximations for Integrated Control/Structure Aeroservoelastic Synthesis

A discussion of alternative complex pole and gust response approximations is presented, motivated by the need to extend nonlinear programming/approximation concepts optimization methodology from structural synthesis to the integrated control/structure synthesis. Two new approximations are presented for the high-order, weakly damped linear time-invariant systems representing actively controlled airplanes in high-speed flight. They are compared with Taylor series, differential equations, and Rayleigh quotient approximations