Techniques for designing rotorcraft control systems

This report summarizes the work that has been done on the project from April 1, 1992 to March31, 1993. The main goal of this research is to develop a practical tool for rotorcraft control systemdesign based on interactive optimization tools (CONSOL-OPTCAD) as well as classical rotorcraftdesign considerations (ADOCS). This approach enables the designer to combine engineering in-tuition and experience with parametric optimization. The combination should make it possibleto produce better design faster than would be possible using either pure optimization or pureintuition and experience.We emphasize that the goal of this project is not to develop an algorithm. It is to develop atool. We want to keep the human designer in the design process so as to be able to take advantageof his or her experience and creativity. The role of the computer is to perform the calculationnecessary to improve, and to display the performance of the nominal design.Briefly, during the first year we have connected CONSOL-OPTCAD, an existing softwarepackage for optimizing parameters with respect to multiple performance criteria, to a simplifiednonlinear simulation of the UH-60 rotorcraft. We have also created mathematical approximationsto the Mil-specs for rotorcraft handling qualities and input them into CONSOL-OPTCAD. Finally,we have developed the additional software necessary to use CONSOL-OPTCAD for the design ofrotorcraft controllers.In order to meet the specification we do not actually have to solve an optimization problem(i.e., we are not looking for a global minimum for the cost functions). In fact, we are just lookingfor a feasible solution, i.e., a solution which satisfies all the mathematical constraints (handling